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I am going from memory and do not have a manual in front of me. So here goes. The incoming signal to the R-4C is converted to the first IF of 5.645-MHz. In the second mixer, SSB and CW signals are

Yes. Rob

Rob, Connect my service monitor/counter to the CAR OSC jack, and adjust C6 for exactly 5645 Khz? Tnx&73 Jay W6CJ nc0b.com_at_groups.io_lastradioman@...> wrote:

That shoulda read...... Eimac 3-500Z cooling specs ( using tapered chimneys and a? PAIR of tubes)? is 20.6 cfm @ .052"? ? for 800w? CCS diss.? ? And? ?26.0? cfm @ .082"? for 1000w CCS diss.

The R-4C derives passband tuning by using a tunable 50 KHz oscillator (BFO) to first heterodyne the 5645 KHz first IF up to 5695 KHz. It then uses that same variable BFO to feed the product detector

The 5645 kHz LO from the transmitter if off frequency. Rob, NC0B

Yes this looks spot on! Thanks Jim... I also attached another view with the old suppressors installed with the factory straight wall chimney's. the tapered version is what Eimac recommends, along with

Group, I have my "new" Twins hooked up and making QSOs. I noticed that with the R4C in LSB, and passband on the LSB "dot" for best LSB reception........ when I turn on the T4XC, I have to re-tune the

I started out with Drake back in 1975 with a TR4C. I used the C line as the main station until 2001, still have several T4XC's, 4 in fact and one R4C, several R4B's, 2C and 2B and amps. I also have

It's an EBM-Papst blower... model # is G2S097- DB61-08? (115 vac version). The 230 vac version is? #? G2S097- DB03 - 01 They both weigh 1.81 lbs, and both are galvanized. 26 cfm @ 0"? ?and 20 cfm

I just recently did the 10m mod on my L7 Tom W9TAB

The L7 uses a 75K pot in series with a 22K resistor. The L4B is 100K with no series resistor. I think your resistor change is still a good idea. Adding a TVS diode with a breakdown rating greater than

No problem, John. Us Canadians don’t get a lot of useful news these days as the feds have decided that we can’t share news on line. Our media is heavily subsidised by the Liberal Gov’t so is

"Jim VE7RF via groups.io" <jim.thom@...> wrote: The funny thing is that those of us that have been using Drake ALC with amplifiers for years don't seem to have any problems with it

Ah, thank you I did not realize that and the shipment was indeed Canada Post. I am full ostrich mode and avoid as much news as possible. I shall be patient. TU again. John / K0YQ

As a side note with an unclear memory, the ALC circuit in the L4B is different than the one in the L7. ?Failure of that 5K 7 watt resistor (which should be replaced with a 10-20 watt style) will

Roger, I worked on several L7s and don't remember access to that "stud and nut 10M lockout" being a problem in terms of access. ?As I recall, it was not in the area of the input tuning coils but

They also used a filter to prevent 11 meter operation in some of the amps. I don't know if they were the earlier L7's or the later ones? Merry Christmas to all and happy holidays. Tim WB8UHZ

We just had a postal strike that lasted 5 weeks. It ended a few days ago. That may be the problem! Things won’t be normal for a few weeks. Canada Post likes to go on strike around Xmas to cause the

By chance does anyone know the call sign or identity of the canadian ebay seller "sell my stuff now" that has long had the NOS drake tr/r7 LED modules available for sale on ebay?? I ordered a set 6