Thanks for helping dispel the false rumors about ETO and 8877's. The most unfortunate thing in all of this is the amateur radio fraternity has been receiving (and some people actually believe) incor
The problem is rooted in false claims, poor technical advice, poor circuit behavior descriptions, and general misinformation. Unless the correct information gets out, the problem will continue. We s
at reduced output at the level needed to drive a high gain amp. >The problem IMD happened at rated output (100w). Hi Frank, While I have never specifically tested and 850, every radio I have tested
What you always conveniently leave out is that in YOUR initial report to Eimac you said you "thought the tubes oscillated, and that overheated the grids". The response to YOUR claim you suspected th
Why would it have audible distortion? The garbage being measured is already 20-30dB down, is outside the passband of the receiver fileters, and the receive detector and audio system already has IM p
wunderkind, I'm not saying anyone at Elecraft was careless or taking anything away from its designers, but we do have to be realistic about things. There is nothing *EXTRA* special or exotic about t
160 That's right, and that's an important observation most people miss Zyg. The important thing is how the rig rolls off on higher order products, not the close-in stuff. I can hear a modestly stron
It is the higher order products that are normally the real problem. 3rd order products are so close the slope of receiver and transmitter filters make it difficult to tell what is going on, unless y
within splatter Actually they are meaningless Ian because of all the harmonic distortion, amplitude changes, and IM that occurs before and after the narrow filters. The rest of the system dominates t
They might have toned down the earlier 775's. Some meters also do not really read short peaks well. What meter do you use? A new habit, imported from CB, is people now turn the little power limit po
I'm not sure how the Nye is. Many not-fast-enough peak meters agree with really fast meters on things like voice, but will miss 2-10mS pulses. That was a major problem when finding meters to test me
I'm almost positive the Alpha 99 is one of the amps that have a tendency to oscillate at very low frequencies when running into certain loads OUTSIDE and far below, **not inside or near**, the band
Run the supply voltage up to automobile voltage levels, when running at highway engine speeds. At 14.5 volts or so the spike level increases dramatically. On my rig (an old 706), using a sample-and-
'fact') news The three-tone test I used to use does this. It is basically a two-tone test with levels varied at a syllabic rate. It is best to do that test with the HF tones at close spacing and at
It is a design shortfall, rather than a flaw. It is juts one of those things that misses you when you test on dummy loads or look at circuits on paper. I actually had the same errors in my designs,
Any dielectric lowers Q of RF coils, especially when turns are close spaced and the coil is not very long with small diameter or when reactance is high. Steel wool may leave residue and is a problem