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...Methinks that thou protesteth too much...

Well., there's certainly nothing wrong with using your DF-3000 for HF use up to 30 Mhz, as the factory spec-sheet states 60dB @ 60 Mhz (no rating at 40 Mhz) but am quite sure it's at least 40 dB @ 40 Mhz.! The original theme behind this "thread" was simply the OP asking whether to place the LPF...

Great to hear you'll give it a "real-world" test.!! Especially if you're using a typical / non-commercial, UHF band / 450 Mhz, GMRS transmitter., you'll certainly see ALL of it being reflected back from a typical 30Mhz LPF (as the Drake TV-xxxx models have a factory stated spec of 80dB...

The "bottom-line" of "passive" (not "active") low-pass-filters (and to back-up our "chastised" member "DudMuck" here ;-) All LPF circuits / boxes WILL produce reflected power from any / all harmonics that are being suppressed by the LPF., AND will affect amplifier performance.! The RF power...

Well agreed 'Doc'.!, and to add 'my 2 cents' to the matter (hopefully without stirring-up a bee's nest.!)., is that when setting-up a larger Yagi (ie: 10/11m compared to a much smaller VHF / UHF) in the vertical mode., that one should place that side-mounted gamma above the boom. Yes / no.?? I...

Yep., that's why I always do my best to never have more than a half-dozen radios and / or amps (in total) waiting in line to be repaired.!! It's also limited to "an appointment only basis", starting with a preliminary, semi-technical, telephone chat (so that both parties can / will be of the...

As shown by the two attached "screen-shots"., the ERF-9530 states a gate-threshold of 2v-4v (using an improper nomenclature of "V/TH"), whereas the 24N40 states a gate-threshold of 3v-5v (using the proper nomenclature of "V/GS(th)" What get's me "blown-away" / amazed., is how someone / anyone...

Yes, I've also had that capacitor (C25) go "open" (ie: down into the nF range.!) which causes very weak (microvolt-wise) and very quiet (volume-wise) AM receive.! But it's more because while the paralleled resistor (R32) allows the Emitter of the last 455 Khz amplifier transistor (Q11) to pass...

This is a petition (on "change.org") to hopefully have the FCC 'act-on' the 'Mud Duck Radio', channel 19, nation-wide interference situation..... The problem of interference to our nation's trucking and 'pilot-car' drivers (and others.!) has been going-on for quite sometime now, and maybe, just...

Ahh, yes, now I know who ya mean, as I too, am quite aware of "Mr. Lewis" and his (and late father's) tendency for the re-banding of some items.!! :( As far as any similarity of me to "main-stream-media" is concerned., I don't believe that my present BitChute channel (which was created just...

You mean me.?!? :( I've been just about the most vocal person against the "snake-oil" claims of the infamous Palomar "Max-Mod" device., ever since their introduction to what I call the "up-sale" (adding / padding a customer's bill) "marketing-ploy" of "pushing" them as some type of...

If you'd like, contact me (Eric) @ Klein Communications about your Motoroa 555 "issue"., as I just might have that simple "C#xxx fix" for ya.! :) https://www.facebook.com/radioman55 or at https://www.qrz.com/db/KY8E

Yes it (the 24N40F) can be subbed-in., but one MUST be aware (in some cases) of the LARGE differences in "VGS(th) Gate Threshold (turn-on) Voltage" between differing MOSFET devices.! The "Palomar" ERF-7530s have suffix designators (A through J) with Gate voltages ranging from 2 to 4 volts. The...

Well my fellow electronics-competent Folks., I just found another inexpensive & easy way to get even a bit more output from your Siltronix VFO 90., or any other brand of VFO (ie: a PAL, Glen, etc.) along with a better (higher) impedance-match, especially for tube-type equipment.! It's simply...

Yes., please check one of yours.!, and if it's not already buffered / amplified with one of those external boards., check-out what a difference R6 can make.! :) As the bottom-line is (and just finished that job a few days ago), is that the output did go up from ~50mv to ~300mv, and most likely...

Re: Siltronix VFO., boosting the output drive level (easy fix I just found.?!) Although I've never had the "joy" of dealing with this particular VFO (the Siltronix model-90) I believe I found an incredibly EASY way to boost its output (some model-years that is) to SIX times its value.! :-)...

The MicroSemi, MS-1051 is a quiet good / rugged replacement for the Toshiba's (FYI: Actually, the non red-dot Toshiba's were better than the red-dot devices, as they had Beryllia-Ceramics for better chip to substrate heat transfer)., though the MS-1051s are a bit "pricey" ($50+ ea.) as compared...

I know this is a VERY old thread here., but just as an "FYI to anyone reading this., I just finished doing some MAJOR repair work on one of those B2500A amplifiers (for a customer in Cape Cod) which had been TOTALLY "cobbled-up" by one of those so-called / wanna-be "tech" guys, and purchased...

You're spot-on there sir.! (y) Correct (x2) again.!! :) You're certainly quite correct with the above two statements, but., a plate-modulated, RF-final tube does not reach 0 volts during the negative going halves of the audio modulation voltage. :oops: Take for example, a Browning Mk-4. The...