Thanks again Phil. The PA module idling currents were not high. With the amp not keyed they were all zero. And keyed with no drive, they were all around 0.4 to 0.5 Amp. I now have them adjusted to as
I only see a U1, U2 and U3, all LM358N. There is a non-zero DC input on the + input of U3, with the amp on and not keyed. So I think that the DC offset may be coming from U1 or U2. I would replace th
The quarter wave termination is high impedance at the end where it joins the Vee element, end and low impedance where it is staked to ground by ground rod. Or if it is not grounded at the far end, an
Hi Phil Your meter is indicating a static current flow that, by measurement, you don't have. Yes That means one of the meter amplifiers on the distribution board (or U5) is leaking. Where is U5? Ken
If your Herc II has one, U5 should be on the distribution board, as I mentioned. Some have only the LM301 chips U1-U4 for the Ic meter amps. Mine only has U1, U2 and U3, all LM358. I wonder how many
Hi Chuck, Thanks for the information. You are right that you ought to use the attenuator. With the S meter pegged on the "in the passband signals", we don't know how far down the "out of the passband
Hi Chuck, Based on your experience copying 5T0CW on 30 meters.... "I had an experience yesterday, I'd like to share. During a time when I had strong line noise, some of the locals were working 5T0CW
Hi Bob and group, What Uses Color Decoders A very good question, and you have explained it very well. Another good question is: What uses 3.5795454 crystals? The answer is: Many many things that need
Question: what are the practical effects of an "unbalanced" SSB signal? As Barry has noted, there is an enclosure with the 2.8 kHz filter that says the carrier "may have to be balanced." I haven't do
Would someone please explain to me what changing the filter from 2.4khz to 2.8khz has to do with carrier balance. I see no relation. The carrier is nulled by balancing the dc voltage on U4 of the TX
You guys have got me confused. "I notice that my used (new to me) Omni VI Plus upgraded to option 3" I thought that an option 3 upgrade was something that could be done to a non-plus version of an Om
FWIW,I've had 2 Opt3 pass through me and neither one said OMNIVI Plus on them. Wow! That must have hurt! Did you swallow them whole, or one resistor at a time?
Hi Jason, I understand why someone with a non plus or version 3 upgraded Omni VI would want the Inrad modification, in order to get another narrow 1st IF filter option. And I can also understand that
Hi Rick, Yes I understand where that Inrad mod puts the new roofing filter. I guess what I did not understand is that with only one NAR button on the Omni VI (non version 3 or Plus) you sort of have
Hi Clark, Yea, I got it. With only one button to control it you would either get the new roofing filter AND the narrow option filter in line OR neither of them. Leaving the narrow option filter out a
Hi Joe, The "Power On" pin of the four pin transceiver power connnector is pin 3. The "Power On" pin of the twelve pin amplifier power connnector is also pin number 3. When the 9420 is plugged in to
Looks like it might be a nice web site, but I'm not getting any of the images. The 301 wiring description is enough without the schematic image anyway. Still I'd like to see his station pictures. Is
Hi Tom, I also have an Omni VI and I love it. I also use only CW. I usually keep the LP audio filter set at 1000 Hz. Sometimes I tune around using the 1.8 kHz 2nd IF filter with the NAR (500 Hz in my
The transceiver "power on" is activated by connecting a load to this "power on" lead. The text does not say what they mean by a load, and it does not say just to ground it. I'll look at my Omni VI ma
The lables on my schematic for the 9420 show where the 3 non-ground wires of the transceiver connector go, to HI I, LO I and PWR ON. Putting a "load" (perhaps a short to ground) on the PWR ON lead wo