W8ji amplifier. W This project was perfect for this 3 5 to 30 mhz au...

W8ji amplifier. W This project was perfect for this 3 5 to 30 mhz automatic antenna impedance matching system 50Mhz - 54Mhz, Full Legal Limit, 100% Duty Cycle Read more → com for parts and supplies for Hi-Z antennas Animated 2 element array comparison The grid RF reference point, which is the chassis ground, is the common reference for both input and output power com Taylor 811A tubes that are still very strong com/index If you … Below is a top view of the homebrew amplifier The PA150 is a 200 Watts SSB/CW rugged HF Linear amplifier units that will give many years of hard working service latest and smallest amplifier About: In this blog we will take a look at various resonances appearing in a vintage Heathkit SB-220 HF Linear Amplifier, eventually analyzing the stability of an un-modified SB-220 amplifier In 2010, Tom conducted a series of lab But I did have an AL and did the mod myself (The twin RJ1A vacuum relays are below the chassis, visible in the bottom photo anode-cathode feedback in a grounded grid amplifier run 1500 watts all day everyday don't miss a lick Poor or improper relay sequencing causing power amplifier arcs AMPLIFIER RADIO INTERFACE S#13049 AND ABOVE: $ 139 S1) 3500 VAC @ 0 Four 572B tubes give you more plate dissipation than a single 3-500Z tube When I first obtained mine, I found that it worked well on 80 through 20 meters (I am not inclined to use an amp on 15 or 10 meters very often) Tuned Input for the Grounded Grid GS-35B triode be/cB5jEVDvAwI: Links MFJ-269 Calbration Instructions Worksheet(WIP) Worksheet- mark2 My manaul from … Benefits MSN OUTLOOK OFFICE SKYPE BING BREAKING NEWS AND The original amplifier has very few protections circuits Jan 30, 2008 click here to follow the link to W8JI Technical pages; if you want to rate W8JI Technical pages use this special rating form The AL-80BX is factory wired for 240 Vac Anode-cathode The resistance value is given by the voltage drop at the maximum current rating Filament Voltage life As I understand it General Electric Medical canceled a contract for a MRI 8877 amplifiers because the manufacturer could not keep the 8877 from intermittently oscillating at UHF For the High Power conversion, this lead will be connected later Ken/all, Recommend reading W8JI's web page on this topic While surfing the net killing time I stumbled onto a "repair" for the AL-811H amp The meter for Fwd/Ref Power, PA Grid, PA Volt has an intermittent issue, it sticks once in awhile feedback is caused by imperfect shielding from anode to cathode inside It covers the amateur bands between 3 ham 3 / 33 This is why Thanks to PA0FRI, VE3FWA, W8JI & AG6K for the valuable information found on their web sites FM101x - New To FM Repeaters ? DX101x - 235 Pages of Real DX Secrets For HF and Six Meters When it went out, I was using it on 75m with a 4 watt drive putting out about 500 watts pdf A physically small loading coil simply inserts a series … RF Amplifier Technical Web Site Those old rigs were not as big as the advertised power makes them appear because of the change from inoput power to output power in the early 1980's Neutralization is primarily concerned with correcting unwanted 4-1000a HF amp -- Home Brew Amp Project By Randy Adams -- NT8N volts cathode bias A 500W amplifier is a ~7dB increase in TX performance and zero improvement in RX For probably about $1000, maybe $1500 (assuming no housing/spousal limitations) you can put up a 50' tower and a triband beam and get ~8-10dB improvement on both TX and RX over a … YOU MUST ANSWER CERTAIN QUESTIONS 3 * Specification subject to change without prior notice The brown wire (above the filament RF choke) needs to be disconnected off the yellow filament wire and attached to the center tap of the Hammond 166J6 The amplifier was complete, unaltered, fully functional and in very nice condition You get up to 1,000 watts output on SSB, 800 watts The amp is 0-12V negative going and the rig is 0-4V Interactive Block Diagrams Actually Amp Supply was starting to work quite well just before the end (user anode damage excluded) This link is listed in our web site directory since Friday Mar 21 2003, and till today "W8JI Technical pages" has been followed for a total of 22018 times First time the power supplied failed Our main goal was to get an optimized low cost Mosfets Linear Amplifier circuit for QRP, with around 10 - 15 Watts PEP or CW average power for SSB and CW, with lower higher order IMD in the 1 572B Taylor Select ALWAYS load your amplifier for maximum obtainable power, and reduce drive to rated, safe, or desired operating power levels! This ensures minimum voltage and current in the tank and maximum possible linearity (best signal quality) SB220 Amplifier [Amps] KM1H vs automatic remote controlled antenna Transmitter Testing Leif Asbrink, SM5BSZ http://www This is a common problem in TL-922 Kenwood amplifiers As with two unneutralized 572B tubes, three 811A tubes are marginally stable at upper HF Over the life of the amplifier, tube replacement will also be an ongoing expense Kit PN 811R200K has one chassis mount RF-rated 25W resistor, one 0 W8JI, May 27, 2005 IMO the amp is a good 1Kw amp, nothing more and its a good thing I bought the extended warranty cause right after the factory warranty was up I just turned the amp on and it went south, didn't even transmit and for mosfets bit the dust #blacklisted blacklisted phone check #computerservice Turn off brain This power will generally be listed on the product data sheet, and 30-120W is typical of modern stereo power amplifiers After a short conversation with W8JI (the designer of the AL-80B and many other amplifiers) on the Ameritron Apply about 50 watts drive and rotate tune cap for maximum forward power output following the modulation process 1 Year Limited Warranty through RF Parts modulated PayPal gift to w8ji@w8ji Kenwood TL-922 Revival Modification Kit It was the first reasonably priced, intelligently designed, SSB-CW, HF amplifier sold to the amateur radio community Antique Radio Forums Index » Category » Homebrew Radios and Equipment The main category is Kenwood TL-922 & TL-922A RF Power amplifier that is about Kenwood TL-922 TL-922A Power amplifier The data sheets on most blowers will show the zero back pressure air flow and then a chart with air flow at different amounts of back pressure linear amplifier built for the Amateur Bands in the early 1980's 27 dB gain (nominal) Works into any load impedance 50 Ohm impedance BNC (f) connectors, input/output HardRock-50 Power Amp Kit Welcome to Command Technologies to replacement with the Peter Dahl Hipersil Transformer above The only place you will run into trouble is on CW or RTTY, or some other high average to peak ratio mode • Amplifier Care and Feeding –www Regrettably, the amplifier kit is no longer The voltage drop at maximum current is typically rated 50, 75 or 100 mV The grid current is almost nothing, nada, zero As luck would have it the transformer bolts are NOT varnished on First inspection TAKE CARE !!! HIGH VOLTAGE !!! 1) Remove all the tubes A blower that will do 100 cfm at zero bp wont be enough 7 That’s enough Kenwood TL-922 Linear Amplifier ) About W8JI Technical pages The resource is currently listed in dxzone than RF output Perhaps the mfg should have read G Recognize: W8JI, W1QJ, AF6LJ, W9GB, K9FV, K9ASE and others for This is an absolute because a hard tube short will usually take out the resistors! Loss of resistors allows the arc to continue to the filament Reinstall the regulator board There is no technical basis for that claim, nor is it factual Discussion in 'Amateur Radio Amplifiers' started by I4LEC, Dec 5, 2015 tuna x treme wz5q hi fi essb amateur radio station with HAM BOOKS BY AC6V Filament Choke - AG6K - "For a HF application, a garden-variety 0 30/10 Reviews For: W8JI Tuning Aid TOF1 Category: Amplifiers: RF Power - HF & HF+6M tube has an anode dissipation of 500 watts, 20-Watt grid dissipation and plate voltage up Even off-on keyed CW requires linear These amplifiers were constructed with high-quality components, in a form-factor that is attractive, functional, and unobtrusive T/R Relay Escalator Amplifier Projects Over 30 Of Them - From The ARRL ) The Cooltron fan has about 1/3 necessary airflow for (4) 811tubes in normal SSB/CW use This amplifier is S/N 551 which is in the "good" range of over 500 as described on the W8JI web page Check it out versus a pecker or pulser Low VHF-Q parasitic suppressors installed in TL-922 by Chris Hembree, W7CTH: TOP, BOTTOM Fast 5 mΩ New 811A tube with emission and shorts warranty Not Yet Reviewed FETs cooked off in the 1st week This model PA150 amplifier has outstanding performance in its class and represents truly exception value for money If your antenna system VSWR is 3:1 or less, you probably don’t need to shell out a ton of money for a high power-capable antenna tuner to follow your tube amplifier It's mechanical construction is equal to or better than any others I have seen offered for sale in that era · The 3-500Z requires only a few seconds of warm-up time Resources listed under TL 922 category belongs to HF Amplifiers main collection, and get reviewed and rated by amateur radio operators An extra 330 pf grid bypass capacitor has also been added to each grid pin FCC regs were 1000 watts input for a long time SB-200 Amp: 1000 watts input & approx 60% efficiency as far as the volt meter,you just need a 12 volt source that is activated with the ign switch and a good ground The site of JF3MKC has very nice pictures and google can even translate for you It's intended use is really to 'tweak' an antenna that's not This amp was designed using a similar layout and similar components in the output stage to several other Dentron products 95: Buy MOD10M : 500Watt MOBILE SOLID STATE AMP, 13 Tom Rauch, W8JI •I mainly use 73 material [high permeability] for receiving applications in LOW POWER applications between 0 More on the R4C short comings ( W8JI ) More on the 2d mixer carrier injection ( W8JI ) R4C mods ( W8JI ) R4C Mods ( W*JI ) R4C Manual Drake PTO repairs More Drake Manuals and Schematics Audio pass bands with stock filters Cleaning of R4C … DX Engineering DXE-RBSA-RPA-P - DX Engineering Reversible Beverage Antenna System Combos As I acquired a G3SEK triode board some years ago I decided that it was about time to start using it in an amplifier The The following are known problems as of this date: 1 com –Applegate • Dip the Plate or Peak the Power? –www $1,200 undistorted operation and maintaining original bandwidth of all three These may be of interest to owners and users of this venerable and popular amplifier If you are performing the Low Power conversion, reconnect the wire to the 160 volt tap on the rectifier board Tube amplifiers carry a matching network as part of their output tuning htm The importance of a good dynamic range in receivers is well known among amateurs #20 gauge Type-WL high-temp electric motor rewinding wire will carry 5A with ease and it has excellent RF properties Alpha 8406 – 6 meter I have a chance to buy a Henry 2KD-2 Amp, unit looks good, it appears to have been hardly used, has a separate power supply and uses three 3-400 tubes The adjustable range of the tube amplifier output I have an Al-80B and use the Ameritron ATR-30 manual tuner with it A site dedicated for the AM Radio Amateur and vintage radio ; If all looks well, install the new 6883B or 6146B PA tubes and close up the sheet metal shields WA7TZY; Tom Rauch,W8JI; Reid Brandon,W6MTF; Bill Clemow, KE7CX; John Fakan, KB8MU; and Steven Katz, WB2WIK) amounted to 5500 words -- an all-time Overview It is currently Jun Sun 05, 2022 5:05 pm In ammeter designs, external resistors added to extend the usable range of the movement are connected in parallel with the movement rather than in series as is the case for Amplifier had experienced a cathode to grid short which took out the bias winding Alpha 9500 Autotune Legal Limit 1 21225 You W8JI should talk, you can get alot of his postings at eham I have an LDG RBA 4:1 balun, so I cracked it open 8 a 30 (50) MHz, F6KBF: Balun and Transformer Core Selection, W8JI Tom makes a strong case for not attempting to 8 to 30 Mhz, for Amateur Radio use, to compare it with a similar circuit adapted around plastic case transistors with a 13 the downside is that it costs $700 Clipperton they are maturity Ham Member Lookups: 145874 - Rotate plate and load controls to 0 (zero) 2 By all accounts, this is a great amp, and obviously, works well with the KX3 This is a very handy device, especially for other people on the band with you It was the first, reasonably priced, intelligently designed, SSB-CW, HF-amplifier that was sold to the amateur radio community n5ot from operating the arrl 160 at the old w8ji station so mark missed the warm up where the operator becomes familiar with the station ' ' ISS Reference Ham Radio … amp information, electrical diagrams scooterhelp com, fuse electrical wikipedia, madelectrical com electrical tech, ford f 150 fuse box diagram automotive solutions, the motorcycle headlight electrical diagnoisis page, section 2 electrical circuits autoshop 101, testing battery holders mpd, ignition amp electrical mustang mustangsunlimited com, Four 572B tubes give you more plate dissipation than a single 3-500Z tube This system will also detect the most damaging of 71 of QST, Sept, 1994 2) Make 2 verifications and change it if not good Put a telescopic mast against a pole, hook the antenna to the top and slide it out the amplifier Cooling the GS-35B is very important Each manufacturer uses their own voltage and current for this simple operation The TOF system solves the overlooked but major problems inherent with tuning pulsers or peckers 8 V power supply, both with The following list shows safe limits for properly tuned amplifiers with different tube types, assuming perfect 100% modulated AM signals: All values are per tube with full airflow Technical resource and information on receiving and transmitting antennas, amplifiers, radios, baluns, for 160 meters 80 meters and other low bands High-mu power triode for use in Class AB 2, Class B, Class C RF, and audio amplifiers Directivity factor 7 Amplifiers with these terminal strips and resistors must be upgraded for safety This is a PDF of the Yaesu FC-707 tuner's operating manual, including operational maximum limits : The FC-707 isn't what I consider to be a 'true' antenna tuner, it cannot, for example, match a random wire to the FT-707 for pymnt NO paypal net> writes: > >Denny Had could not make Amp Supply work, and it folded You order a nice amplifier, only to discover you also need an “interface” to connect the radio and the amp feedback that occurs from normal The cost is $99 plus shipping Subject: [FT817] Re: Amplifiers Tom Rauch, W8JI, has done the very test you seek, it isn't too complimentary: CORE) A-0518/ C-CORE STYLE # 09 HIPERSIL C-CORE Ameritron 811H - HAM RADIO (volt meter should come with directions for wiring)thats all you really need I use it mostly for a balanced wire antenna for 40 and 80 meters typical 3-500Z So I sent the amp to the guy who originally designed the amp, instead of getting warranty service through MFJ Applications include radio communications, cellphones, EMI testing, and much more The power draw when the amplifier is actually providing output current is a far more com- Opening the Clipperton-L - I noticed there is plenty of room to fit the transformer (un-modified photo to the left) 928bolo Home of the AM Press/Exchange, The AM Forum (the largest BBS of it's kind),and The AM Classifieds, Photos, Audio, and technical information All contents of this site are the property of W8JI, but links from other sites are welcomed g) Neutralization Capacitor A new 390 pf 1KV mica capacitor is installed on the driver's •For high power applications at HF it is often necessary to use lower permeability cores If a dip is found on a band the amp should work on, do not operate the amp on that band until the choke it replaced with a choke that Link to K7TJR 8 Element Receiving Array uses Hi impedance amplifiers and shortened verticals By: K6KK Without everyones help and input, I may not of gotten this amplifier working If you have a link you think valuable to others, please e-mail me There are also reports on eham reviews of receiver front end destruction due to tube arcs getting back to the transceiver amplifier features fast warm up and 1500-Watt RF output with 100-Watts of drive Nevertheless, after reading your article and printing out the tuning instructions, I successfully tuned up the AL-80B for the very first time They cover all bands from 160-15 meters, including WARC and MARS and may be user-modified for 10 and 12 meters by FCC licensed Amateurs Inexpensive way to increase the switching time for slower mechanical T/R relays The Amp is an extension of your will com">mailto:amps@contesting W8JI Ameritron AL-811H Modification Photos & Instructions See www Warranty 1 year from date of sale against gas, shorts, and " - Ben Franklin changed "bubbled" 220pF with 500 pf silver mica on grids 4 This is true even when the amplifier does not have a directly grounded grid Others, using potentially damaging You get absolute stability and superb performance on higher bands that can't be matched by un-neutralized tubes On 07/11/2021 20:47, Mark Gottlieb wrote: Hi Everyone, antenna-design-and-rf-layout-guidelines-pdf 2/8 Downloaded from lms Fortunately my amplifier was not quite as neglected as this one Tom, It seems you do not know some Chinese tube's history High grid current is a strong indicator of excessively light loading in grounded grid amplifiers By: AG6K E This includes parts inventory for AMAZON CO UK RAISED BOWLS AMP FEEDING STATIONS FOR DOGS S2) 10 The censor is George Fremin III - K5TR Tom suggests either using a 3 tone test with the 3rd tone being low frequency so it modulates the other tones at a syllabic rate, or using voice modulation (an adjacent channel power test) It seems constant tuning and re-tuning for those extra 5 watts will kill the tubes very quickly and take out other parts in the 811A amplifiers Please be aware MFJ has made multiple changes in the AL811 series, not all of them are good changes Rich says that the best method to … Only Ameritron AL-811H amplifiers give you four fully neutralized 811A transmitting tubes Amplifier Links-- Via WA6BOB Here are important specifications for these incredible DX Engineering RPA-1 Receive Preamplifiers: * Gain: 16 dB, +/- 1 The new linear amplifier for UHF band based on Freescale IC is an excellent design made for special applications, lab testing, digital and analog RF and TV applications This is the same choke as in Ameritron amplifiers and it was developed by W8JI, see Tom's webpage for more info The G3SEK triode board ) The blower cage is … About TL922 Mods by W8JI The resource is currently listed in dxzone 8A CCS ALC Overshoot - This is a subtle point made by W8JI suggesting the when using reduced drive (possibly making the ALC effects on initial signal greater), there may be a tendency for a startup impulse into the amp that can distort the initial amp signals You have to email me at the order link below and tell me your particular type of amplifier If the meter dips at any point in that range, it is highly likely that it is a series resonance The problem is that there are no standards for connecting the keying circuits of transceivers and amplifiers easyest way is to disconnect the wires going to the back of the amp meter and hook them together 5@100MHz suppressors SWLs and Radio Amateurs around the world have come to rely on the advanced operational performance of DX Engineering RPA-1 Receive Preamplifiers 5 inches long, 3 Fyler's article in the Sept Review Summary For : W8JI Tuning Aid TOF1; Reviews: 1 MSRP: This board was designed by W8JI, the original AL-1200, AL-82, AL-1500 series amplifier designer the way this board would have been made without cost restraints What comes to mind is reducing the 3000 output to 75 watts and ignoring ALC connection as the amp is rated full output at that power, realizing that over drive situation should be resolved Fortunately covered under warranty " Photo of tuned input used on the G2DAF amp by · The AL-80B uses a rugged, inexpensive 3-500Z tube $269 USA mainland shipping included The linear amplifier LA24 is designed to drive inductive loads like magnetic actuators with extremely low noise w8ji Note there is net> Date: Thu, 12 Dec 2013 09:11:57 -0600: List-post: <amps@contesting This page has information on how to check the AL-811H amplifier for problems and how to make these repairs 2KW Solid State Amplifier) That sounds simple enough, I thought 160M thru 10M, 1500W, 100% duty cycle Read more → demo of a highly modded upgraded Dentron DTR-2000L linear amplifier with single 8877 3CX1500A7 tube output shown on an Alpha It’s a huge step up from loaded and tricked out FT1000MP Other important parameters include the to QRZ Sub rx is as good as the main 572B began to produed only in early 1990s Jr, W8JI, Ameritron's principal engineer for this amp, to respond with his own web article presenting his side of the story Amplifier Articles -- Several good ones from Tom W8JI Ameritron 811H amp for sale network w8ji com Henry no longer has the part, no surprise there 750 inches deep, 3 Q=1 6Vdc, 80A, US ALS-500M HF AMPLIFIERS/PREAMP Amplifiers; Baluns; Boatanchors; W8JI W8JI’s Receiving Antennas Conventional Beverage’s ~580 feet long in seven directions The main category is EH antenna plans that is about EH Antennas Via Tom, W8JI (who sells these Tuning On the Fly (TOF) devices) Chinese 811 and 813 have been produced morethan 40-50 years Review Summary For : W8JI Tuning Aid TOF1; Reviews: 1 MSRP: Re: [Amps] Boycott New Chinese linear Amplifier Amplifier Projects -- VHF/HF drivers and more -- From Communication Concepts, Inc Another friend had the ALS-1300 350 amp surge clamped rail It is capable of 1000 watts PEP input power in SSB or 1000 watts d-c input in CW service with any exciter (such as the KWM-1, KWM-2/2A, or 32S-1) capable of 70 watts PEP output and performed the modifications recommended by w8ji Improper Drive and Amplifier Tuning how incorrect drive and loading adjustments cause power amplifier arcs, especially with exciter power overshoot some great explanations by W8JI; Dealing with potentially destructive parasitic visitations Reversible Beverage Antenna System and Preamplifier Combo Email: Login required to view amplifier draws when connected and turned on, but with no signal passing through it and only its small signal circuitry is operating You are on air within 5 minutes! An additional advantage is that the antenna can easily be polarized vertically Vacuum Tubes/CPI AB-18 New v2 Ameritron 811H - HAM RADIO - $1,200 This reduces the stresses on the amplifier considerably while tuning up The four 6KD6 amplifier tubes laid horizontally in the PA cage and used FL2000B September 1969 with the introduction of the FL200B Yaesu made a significant step forward by moving away from using sweep tubes in it's linear amplifiers and using two parallel Cetron … Ameritron HF Power Amplifiers which are accidentally over-driving or accidentally under-loading the linear amplifier The 30L-1 is a portable r-f linear power amplifier, including plate power and bias supplies I will need your address also 7 MHz - 1500 Watts minimum on all served bands - <-30 dBc Read more → Stop trying to notice every nuance of what you might see and begin to question it Say max drive my amp will take is 75 watts and the radio does 100, so from what I have read it seems to me you are saying the rather than reduce the exciter drive below 100 watts put a attenuator between the rig and amp Unfortunately, that original design (now 30+ years old) included a number In reasonable 2003 Sep 29, 2021 [The original "Plywood Box" 20db amplifier is now included in the Ugly Amplifier photographs ohms to infinity! CB Amplifiers Converted to Ham modes, CW, SSB, and AM, requires linear amplification on stages The modern TAYLOR 572B is virtually an exact copy (both mechanical & electrical) of the original Cetron 572B/T160L tube The AL-811H went through some changes in 2011 so If you have an AL-811H that was built before 2011 you might want to do the following mod Really there are several good manual tuners that work well at the power level of … Linear Amplifiers for Ham Radio come in many size, shapes and flavors The amplifier is only amplifying for around 17% of the time while you tune up using this method For a video see YouTube W8JI 811A History Amplifier is set up for 160 through 10m and does ~800w on 160 through 20, 700w on 15 and 600 on 10m Two Hi-z elements spaced 1/8 wavelength with varying phase delay with no resistor com when using these instructions if you do your own kit #8 This page has also been created with the help of W8JI learningtogive produces about 30-35 Adding 160 Meters The VK4YE 1 KW Linear Amplifier-- Home Brew KW Project · A dynamic bias circuit eliminates hundreds of watts of unnecessary heat generation in the power Amplifier tube (courtesy of W6RD, Chuck and Terry, W6RU)] [AMPS] mailing-list is a source of amplifier discussions 95: Buy ARI500 : AMERITRON MOD10M: 10 METER MOD KIT: $ 53 Hopefully, any dips found with this method are outside any amateur bands Stop analyzing I have owned every amp known to man from homebrews to alphas the ameritron al1500 is the best amp I every owned mine has the pd transformer and it is a tank it will outlast me for sure and legal limit is loafing applicable to the Heathkit SB-220 RF Power Amplifier On Fri, 25 Apr 1997 21:38:16 -0400 "Tom Rauch (W8JI)" <W8JItom@worldnet Vacuum Tubes/high_voltage_rules_revised FL2000 Top and Bottom Views AL-811HD gives you 800 Watts output in SSB and 600 Watts for continuous duty in CW, RTTY, SSTVand AM operation 5 and 29 Lacking a proficient contest op, I still pushed W4AN to 444,528 points with 1544 QSO's and 126 multipliers automatic antenna tuners amp couplers ab4oj Hallelujah! That was two days ago the tube, as well as additional feedback outside the tube Amplifier is currently wired for 220V operation org on June 4, 2022 by guest principles, characteristics and design procedures [8] [9] [10] Well, that seems to have fixed the self resonance issue and we’ve managed to bump up the antenna efficiency to 91% from 82% … not a huge increase ( About 0 So far received 1 votes for a total score of 10 For example, a shunt resistor rated with 100 A and 50 mV has a resistance of 50 / 100 = 0 and amplifiers This is what the original transformer looked like in the 2K prior So far received 37 votes for a total score of 8 My "NEW" amp I had for 9 months suddenly developed a problem with the amp not unkeying after transmitting OK, I just ran some tests: On 75 meters, I have to drive the amplifier with about 40 watts to get 400 out The amp was sent off to CTR Engineering (W8JI Tom Rauch) to have the grounded grid mod, GDT's installed, and to have him go through it and make sure everything is top I added a switch to the front panel of the Amp so W8JI Rating: 2020-05-28; Please Read This Time Owned: more than 12 months 5 MHz to 520 MHz This means the amplifier output device dissipates at least three times the carrier power as heat when a good amplifier is properly cooled, tuned, and operated PA0FRI' style parasitic supressor 3 A caveat: If you question the gaffes of our recognized amplifier expert**, W8JI, you would do well to expect trouble from the censor HAM RADIO STATION GROUNDING LIGHTNING PROTECTION Yaesu FL2000B Although nearly all modern linear amplifiers will interface seamlessly with any transceiver for running Semi-Break-In CW, very few are suitable for fast QSK CW A normal physically small (physically small compared to antenna length or wavelength) loading coil or loading inductor does not replace a missing fraction of a wavelength This is a 100W amp, specifically designed for the KX3 I acquired a practically working pristine Henry 2K Classic HF RF amplifier the range of 2000 See W8JI’s website for some practical examples All times are UTC [ DST] I have the MP eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail notifications when new reviews are posted caps for ameritron amps ( AL82, AL1200 AL1500) 2 are abt 3" tall, and 1 is abt2" tall Output is STILL difficult to measure accurately unless you’re very well heeled This amp has been repaired three times at MFJ/Ameritron I have done the mod and The amplifier is This is why I recommend people new to amateur radio just buy a new amp with ameritro warranty Fortunately, the next morning I happened on your article when looking for guidance 75 inches of vertical space 8-29 I feel W8JI design another nice value priced amp in todays solid state amp market The amp will be drawing 10 amps or less short term average from the mains Has quad matched RFparts The Heathkit SB-200 is capable of delivering over 500 watts T he Kenwood TL-922/TL-922A is a relatively low-cost HF linear amplifier with outstanding ergonomics #2219-6293-0210 #72's #7-9 Youtube Video https://youtu The 500LA is a 520 MHz 3 Watt RF Amplifier from ENI Gettering Tubes AL572B AL80B This is a short video of the W8JI Fan Speed Mod for the Ameritron ALS-1300 (1 e-ham Over-coupling tribute to W8JI Gold) Date: Fri, 24 Oct 1997 17:37:33 GMT Subject: Re: [TowerTalk] MFJ 259 vice Autek RF analyst In message 2 N5OT had no amplifier during much of … A 2KW Heathkit SB-220 amplifier is rated at about 600 watts CW output, and around 1100 watts SSB PEP output The AL811 should have a 200-ohm cathode swamping resistor, or even lower swamping resistance Collins 30L1 Otherwise there is no way to tell if you are a spammer W8JI relay/center tap bias mod 2 The circuitry is very basic and mostly reliable given the I did install one of W8JI's tuning modules in one of the amps I repaired but it seems to only extend the life of the 811A's marginally I had previously read the information posted by W8JI, the amplifier’s designer A meter designed to measure electrical current is popularly called an “ ammeter ” because the unit of measurement is “amps Rock it a little to find peak N6FN Nifty Accessories - Ham Rig Programming Guides This link is listed in our web site directory since Tuesday May 15 2018, and till today "Reviving a Modified Kenwood TL-922 Amplifier" has been followed for a total of 189 times ** see p TAYLOR is the preferred choice for FL2100 net TL-922A Reviews, Circuit Improvements for the TL-922, TL-922 Linear Project 1 Shopping Cart: 0 items: Manufacturer Info - Ameritron Homepage - Other products: Follow us on Facebook KENWOOD TS590SG A "meter worshipper" can go through the tubes pretty quick Kenwood TL-922 TL-922A Power amplifier category is a curation of 15 web resources on , eham The best 3-500 tube being manufactured! Audio and Video chat rooms The first time 1 and 30 MHz For another point of view there is the W8JI site WEIGHT 38 LBS 811 was called FU-811 in China W8JI Ameritron ALH Modification Photos & Instructions The next two times the FETs failed He has an outstanding web site where he shares his knowledge with all of us who are willing to take the time and read it, AND he was the chief architect of the portfolio of Balun products sold by DX-Engineering in the states An advantage of end-fed antennas is of course the simplicity, especially for fieldwork this is a huge advantage com in 3 categories The minimum air flow is 90 cfm Henry RF amplifiers maybe big (34" tall), heavy (150+ #s) and old (1960-1990s), however high power RF amplifier technology has not changed much over the Disagree x 1 An amplifier with the input applied between the cathode and grid and the output between the anode and grid is called a grounded-grid amplifier For example 1000 watts PEP CW power is the same as 1000 watts average power with the key locked closed HENRY 2K MODIFIED HIPERSIL TRANSFORMER 01uF coupling capacitor, and necessary hardware com> My 25KW amp is better than your 25KW amp W8JI: From: "Doug Renwick" <ve5ra@sasktel Thanks for visiting W8JI ” Tom Rauch, W8JI, has done the very test you seek, it isn't too complimentary: Excellent Articles on Amplifier Improvements and Discussion of Parasitics • Rich Measures AG6K, www com> Date: Sat, 24 Jun 2006 20:05:39 -0400 At 2000w out with 120W of drive and 250mA of indicated Ig, grid dissipation is only about 30W with a peak emission current at the crest of the cycle of about 4 amps With my amp, I noticed that the B+ voltage, which should nominally run about 3100V on the AL-80B, was instead running only about 2800V, as indicated on the panel HV meter to 4000 volt W8JI and the company were selling what, "Linear Amplifiers?" I installed it differently from W8JI, because the terminal strip was mounted differently, and this resulted in the shortest lead length This plot was revealing as I could appreciate the amount of distortion introduced once tuned the AMP (a single ceramic triode) without over-coupling compared with … Tom Rauch, W8JI, and Rich Measures, AG6K, both agree that trying to use a two tone test for judging IMD on an SSB transmitter is not the right way to do it * Dynamic range (IM3) at 500 Hz BW: 110 dB or Tom W8JI has lots of coverage on Beverages on www com - Antennas Radios Amplifiers Baluns and Receiving Systems for HF Provided by Alexa ranking, w8ji W8JI Quality control had been drastically improved; input and output circuits were redesigned and new products were coming out The QSK controller PCB is in a shielded sub-compartment in the lower left of the photo PR) 120/240 VAC 60 HZ 1 PH 5", Mu=125 rod, 3" long can be used to make such a filament choke 5 dB, from 300 kHz through 35 MHz 97 Add To … NOTE: AC6V com Applegate, K0BG W8JI Web Site QST References • Do I Need a Linear Amplifier? –W1SE, Aurick –April 1994 • Amplifier Care and Maintenance –N0AX, Silver –Sept it is copy from Russian G-811, 813 was called FU-13, it is copy from Russian GU-13 If your amplifier has a Good Amp once it is fixed by Tom W8JI Time Owned: more than 12 months 100*(15)/(15+75) which rounded up is a 16 W8JI warns that the FL-2100b can spike According to W8JI, all Dentron amps had essentially the same problem This link is listed in our web site directory since Sunday Jan 8 2012, and till today "TL922 Mods by W8JI" has been followed for a total of 992 times $414 Frequency Range: 1 Ammeters Measure Electrical Current The result was I (W8JI) pecked away at the keyboard, mostly with a paddle K8DXX Rating: 2017-05 #30044 A friend of mine bought the ASL-600 org • Excellent info on a number of amps, by PA0FRI • Excellent technical article on Amplifier Stability, by W8JI : BOOKS : SOCKETS : CHIMNEYS : … 1 2 VCT @ 15A CCS He is an experienced operator and knows how to use an amplifier Without one, you can mistune on carrier and not know your amplifier is flat topping on SSB Amplify RF and Microwave signals to measure, test, and design circuits com • Is That Amp Really Worth it? –www Improved direct drop in for all 3-500Z amplifiers including older Drake, Heathkit, and Henry amplifiers Part Number: DXE-RBSA-RPA-P W8JI said: ↑ att com Alpha 8410 – manual tune com is an archive of Rod/AC6V's webpages, and is no longer being updated This board features: 1 Doug "Those who would give up essential liberty, to purchase a little temporary safety, deserve neither liberty or safety 811A Tube Re: [Amps] SELL: Ameritron AL1200 Contestor's Amplifier (score: 1) Author: "Tom W8JI" <w8ji@w8ji Command Technologies began as an radio frequency power amplifier company in the 1980’s heyday of Amateur Radio as a high quality amplifier manufacturer Specifications @ 15 degree wave angle: Every 45 degrees from NE to NW I figured it would be a quick fix #2219-6293-0210 #72's #7-9 electrical system w8ji com, 12 volt battery wiring diagram download25 update 2019, 12 volt charging plug best place to find wiring and, fault finding the vw charging system vw resource com, 12 volt batteries in series diagram download15 update, gm charging system wiring diagram roshdmag org, ford i need a wiring diagram tractor 12 volt PA150 HF LINEAR 200W Amplifier com! Included is a Harbach electronics soft start board but that is not installed At some point in time we will proceed to make a few engineering measurements as to the ‘forward’ and ‘reverse’ gain, ascertaining the New: Click here to got to the schematic modifications The above photo shows the two 10 ohm grid circuit damping resistors and straps tying grid grid pins together on each tube As of December 9, 2020 W8JI purchased all assets, technology, and the name Command Technologies from the previous owner very little change PLEASE do not send a "thanks for letting me join group" post QST The Care and Feeding of a 3-500ZG filament You get up to a full kilowatt PEP output from a whisper-quiet compact desktop linear with Ameritron AL-80B Linear Amplifiers Limited Supply •A downward slope in permeability with increasing frequency is useful for controlling impedance in broadband Power Levels (“input” vs “output”) 1960: far easier to accurately measure DC power “input” to the amplifier from power supply… A Tech-Tip created by Paul Peters, VE7BZ 3) Verify the large capacitors of the power supply How To Obtain A Ham License Specify AL1200/1500/AL82 or 33uF capacitance engineer G Shunt resistors have a maximum current rating The authors SB-220 amplifier was purchased from the original owner in 1988 Through the years 1992 to 1998 And an SSB PEP power rating of 1500 Watts from a Linear Amplifier sure sounds more impressive than 750 Watts plate modulated AM, which, by the way, under the pre-1990 ruling, was 3000 Watts according to the 4XPc rule of thumb com; N4XY schematic PDF's; VA3AVR Circuits for the Hobbyist; Web EE Schematics; Discover Circuits; Practical RF; W8WWV Experimentation; Local Time: 3:01 AM There are certain design measures in the W8JI updates that protect the amplifier from damage if arcs occur The 3-500Z is a relatively inexpensive tube and has been around for a long time View unanswered posts | View active topics $ 39 F The Heathkit SB-220 -- a two 3-500Z amplifier -- made a notable impact in the world of amateur radio when it debuted in 1975 7 mc radio site symmetrical matchboxes dj0ip in bias voltage over Normally 40 watts in would drive this thing to about 1800 watts a single fan for forced air cooling under the PA compartment About W8JI Technical pages The resource is currently listed in dxzone W8JI, who also had a hand in engineering the noise filtering for the new SPS power supply hizantennas One interesting feature of this amp is that the software is all open-source and A MAKER’S somis Tom Rauch, W8JI, is one of the most renowned antenna authorities of our times W8JI Technical pages Amplifier, vacuum tube, receiving beverage loop vertical and transmitting antenna system technical information radiation resistance, EH antenna, noise,receivers, and information on keyclicks Estimated Ship Date: Today By: W8JI With the screw connection style capacitors, it is very easy to make a mistake PSA-A Phase Shift Amplifier ; Superphaser-1 Phasing Unit (HTML) Superphaser-2 Phasing Unit Mini-MWDX-6 Phasing Unit (1995) (PDF) BFE-C Balanced Loop Front-End Amplifier Card (HTML) This link is listed in our web site directory since Friday Mar 21 2003, and till … This is a short video of the W8JI Fan Speed Mod for the Ameritron ALS-1300 (1 All models are easily converted to other supply voltages between 90 and 250 Vac sm5bsz #3 95 each Login is required for additional detail AMERITRON mounts the 572B tubes vertically, not horizontally, to prevent hot tube elements from sagging and shorting out com in a single category 34: A Single Triode 350 Watt Power Amplifier with the Svetlana 572B Tube (translations from article published in the Spanish CQ Magazine, August 1997) I replaced the tubes, filament, transformer, etc If all tests work OK, try the amp with an exciter at low powers first beginning at 5 watts, increasing in 5 watt steps while monitoring power output 7% duty cycle AL-811H amplifiers cover … The Heathkit SB-220, two 3-500Z, amplifier made a notable impact in the world of amateur radio when it debuted in 1975 com; DXing As with SSB transmissions, AM and CW transmitters are amplitude Reviews For: W8JI Tuning Aid TOF1 Category: Amplifiers: RF Power - HF & HF+6M The person who I purchased the amplifier from told me one of the 3-500Z tubes shorted resulting in opening the bias zener This amp kit costs only $300, but the maximum output is only 50W Each This unit was modified (similar configuration to the Australian market single rack 1 kW system) to contain the current HF-8014A Exciter, HF-8054A Receiver, HF-8064B Preselector, a single HF-8023 1 KW solid state amplifier and its matching HF-8032 Power Supply unit The exciter would be at 100 watts and the attenuator will cut it back for max load watts into the amp In my opinion, the TL-922 was a well designed and mechanically sound H 29 dB, Half-power Beamwidth 78 degrees Arrays of Broadside Beverages 780 x 350 feet: 5 dB) so I could use either diameter copper tube in this case W8JI USA Amplifier Tube Arcs causes and cures including real reasons why grid chokes fail k0bg