Wrong answer for amplifier testing. While you can approximate proper "two-tone" testing with a sound card tone source when evaluating a transceiver, a LOT more is required for accurate and technicall
Well Jeff, I both agree and disagree with your statements below. I agree with your statement about guys not measuring at all. But I strongly disagree with telling these same guys they can do "adequat
Wrong again Joe. Joe, K1JT, has real insight into this area. He has programmed the DSP in the soundcard tone generator to produce a smooth phase transistion between one tone and the next. The result
The beauty of 1 dB compression power is that unlike two tone testing, absolute accuracy is not required to achieve proper operation of the amp. All that is required is some linear response indication
This only works if the amps is tuned for max carrier power and then the drive is reduced so that the PEP output power is 20-25% less than the carrier tune up power. Otherwise if the amp is tuned for
There is no turn on/turn off. That's what I'm trying to tell you. The smooth phase transition that occurs as the tones change from one to the other is exactly the same as slowly turning the knob on a
What are you talking about? How does measured power applied to the input jack have anything at all to do with what's going on in the exciter? I don't understand your point. 100 Watt carrier doesn't c
Oh now I understand. You are assuming that everything possible is going to be worst case. Broken amplifier, broken load, broken exciter and broken operator. Given that assumption, I have to agree. Si
Vic, I think you just got a bad resistor. I've been using similar resistors (from digikey) for my attenuators up to 100 watts and 144 MHz with no issues at all. You can see photos of one of them on t
Vic, Most of those "caddock" style thick film jobs are rated for several hundred volts standoff. Maybe you torqued the mounting screw too tight? Or maybe it was the series resistor that died. That *m
I have a pair of Coleman lantern chimneys that measure 4.75 ID and 5.25 tall. There is no part number but say made for coleman by Pyrex. I removed these from an old amp and will part with them if som
I have some of the air variables referenced. I also have a large number of other "vintage" air variables, single section, dual section, and butterfly. Many are used (removed from equipment) but I als
The recent post regarding water cooling amps has been very interesting. Since I would like to build a liquid cooled tube amp, I'm looking at every bit of information I can find. Some questions I have
Does anyone know where I might find air flow requirements for the GS-31B and GS-35B tubes. Pressure differential across the cooler vs. dissipation would be nice but I'll take what I can get. I've sea
Can anyone suggest a source of high voltage feed through capacitors. I need 5 KV minimum and 270 pF to 1000 pF. Any leads to a supplier would be appreciated. Thanks & 73, Larry - W7IUV ______________
Carl, Yeah, it's for a 432 amp. At that frequency the series inductance of a single "normal" disc ceramic is enough to prevent good bypass action. Results in a lot more 432 energy running around on t
FWIW here is an "update on my feed through capacitor problem: The amp in question is a GS-31B based on one of the YU1AW designs shown on the ND2X web site. This design specifies a anode choke bypass
Out in the shop, I have a number of used oil caps. I would sell them cheap, probably shipping would be more then the price. If someone has a real-genuine-sincere interest in these, I can dig them out