You may be surprised to know that the AL-82 uses the same capacitor vendor with the same plate spacings as the SB-220. It uses the same bandswitch construction as several Dentrons. Generic Modutec me
G'day Jim What sorta anode volts did you run to get those output figures? I have a known good 3CX3000A7 pull here as well as the filament tranny and perhaps one day. . . . . . 73, Alek. http://www.qr
load. later... Jim VE7RF _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
Thanks Jim. That means 6kV should see it singing merrily. 73, Alek VK6APK http://www.qrz.com/db/vk6apk http://www.qrz.com/db/vk6py _______________________________________________ Amps mailing list Am
ORIGINAL MESSAGE: REPLY: I can't speak for the ARRL but pulse tuning does not "sag" the power supply enough. You could pulse tune first and then tune at full carrier, but why bother? Just tune full c
Nor does SSB. That's why it is good to pulse tune. Its as close as you're gonna get. 73, Alek http://www.qrz.com/db/vk6apk http://www.qrz.com/db/vk6py _______________________________________________
ORIGINAL MESSAGE: REPLY: Another way to look at it is that full carrier tuning for SSB gives you a wee bit more "headroom" than pulse tuning. I don't think it's good to try to squeeze the last tiny b
I've never related tuning with headroom and I don't get it. Tuning has always acted like and an adjustable attenuator to an amplifier's transfer charismatics. Tuning's impedance matching seems prima
An under loaded amp will "flat top" (clip the peaks of the signal) and cause splatter and distortion (Intermod). It is important that the amp be loaded heavily for SSB operation. The best way to do t
Does pulse tuning at max PEP out with a higher plate voltage than normal really give you more over head, or less.? IOW, you are tuning up at a higher plate voltage than normal as it won't have the no
ORIGINAL MESSAGE: REPLY: Here's how it relates: If you tune up with a carrier of, let's say 1000 watts, and you tune for maximum power output, you will have a perfect impedance match and greatest pow
With full carrier and full output, you can also adjust the ALC so it just becomes active. Then when talking keep the drive down to the point where you are just under where the ALC becomes active, but
ORIGINAL MESSAGE: REPLY: There are two kinds of ALC and I think Roger is talking about the kind of ALC that is fed back from the amplifier to the transceiver. With that kind, I fully agree with the a
True, I too have one, but if the exciter is over driven using lots of compression with the ALC serving to limit the output they can sound pretty nasty too. <:-)) The other night I was working some DX
ORIGINAL MESSAGE: REPLY: Yes, over processing and compressing and all that stuff can make a signal sound awful, but that does not necessarily mean splatter over to adjacent channels. It is possible t
The short coming to the "internal type of ALC" is that is doesn't take into account anything occurring in the subsequent amplifier/s. This could include the screen current of tetrode and pentode tub
I do feed the ALC output of my AL-80B back to the exciter. The 80B has an ALC sensitivity adjustment on the front panel, so I can somewhat control the PO of the exciter from the amp. However, it is i
Pulse tuning: Maybe, maybe not. Look at some typical load impedances of an amp. 3000 volts at 1 amp/2 = 1500 ohm plate load. If you tune with a pulse tune the plate voltage stays near 3k. Now tune up
ORIGINAL MESSAGE: REPLY: I think there is something wrong with your example here. If you tune up a legal limit amp with a pulser at 50% duty cycle, you are tuning up at 750 watts average output with
That's what I thought. It's the instantaneous current and voltage in both cases, not average. Voltage sag has to be taken into consideration. 73 Roger (K8RI) _________________________________________