There's one little word missing there: you mean dissipation RATING. The resistor's dissipation limit is set by the maximum working temperature, so the dissipation rating - the dissipation that is ava
? page number? ? In a typical 3-500Z vhf-suppressor, R-sup has 10nH of L and L-sup has 100nH. Are you saying that less L in R-sup tunes the anode resonance lower in freq.? ? Are you saying that it i
? Dissipation. rating is not the subject of the *QST* article in question. Rich... R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures -- FAQ on WWW: http://www.contesting.com/ampfaq.html Sub
? In my copy the statement about curing a parasitic by adding L to the "plate" is on page 501. However, Terman also recommends a resistor in the "plate" lead, near the tube. A parallel L/R combinati
Hi Rich, I've never questioned your article or mentioned that in this debate. My point was strictly that I believe that resistors in parasitic suppressors fail not because of oscillations but becaus
? On 10m, with too much L-sup, high anode supply potential, and AØ/NØN, R-sup can melt-down. However, when R-sup fails on 15m, 20m, 40m or 80m, there is seemingly no way that enough fu
be Not so sure about 15, though. However, this argument assumes that the ambient temperature of the environment in which that resistor sits is low enough that the resistor still has dissipation capab
? good point ? agreed. ? the R-sups in the 922 receive cool forced air and they are virtually HF-shorted by silver straps. Does it seem likely that lower-band RF could damage these resistors? - chee
This brings us back to the old problem that we never know the condition of the resistor (and/or tube) immediately before it failed. Was it still like new, or had it already deteriorated way out of sp
? An intermittent push-push vhf parasite is typically so brief that it causes no external damage to R-sup. Instead, the damage is internal, and, as such, can only be discovered with an ohmmeter. How
But that still doesn't answer the question. Nobody checks until *after* the amplifier fails. 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwte
Don't forget as well that hindsight is always 20/20! 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contest
? such a question appears to be a defensive measure. - cheers, Ian. Rich... R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submission