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It's a waste of time and money to design an AF amp for the Drake. I used a (now) 75cent complete TDA2030 module from china. Like this one:

At this point I am suspicious of that 1.3 MHz reading. That may be a spurious reading. It seems to me that the VCO should not be able to run there. What is the level of the signal? The frequency

FWIW the TR7 uses an LM380. It works pretty well. "Mike Bryce via groups.io" <prosolar@...> wrote: -- 73 -Jim NU0C

Rob, There’s always the possibility of starting over, making the changes to the artwork as necessary to use newer parts and or different parts with different footprints. I have time to do a few…

Using a doubler off the fil line has been done before.? ?We used a doubler (FWD) and used the 5.0 vac fil on the drake L4B fil xfmr sec winding....to obtain? 12.74 vdc (after V drop from? both

Yes Gary I did the ground on RFC505? when looking at the frequency on the counter and it does drop a lot. So I guess you are saying the High VCO is oscillating at 1.3 MHz . If that is the case there

Right now, just a power supply. I am considering letting go of my A Line (late s/n, the transmitter is essentially an T-4XB) and my L7 (has a Harbach board, graphite tubes and I reworked the power

2c. I would also be interested in the R4C printed circuit boards for the Sherman Mods...I've been collecting parts. TNX & 73, Tom Cunningham WA6VZN in Maryland

After I found that Rob's Product Detector could help an R-4B, and heard that it was ok with him to make the kit ourselves, I re-designed Rob's board except using SMD.? My board is therefore smaller

Hi Steve, Oh. What are you looking to part ways with? 73 Stan KM4HQE

With me, it's the AC-4's I have run a switch to the MS-4 to channel to the speaker whichever rig I'm using at the moment. They take up space. The AC-4's sit on the floor and don't complain much ;-)

Hi Stan, All that was ever installed for an R-4B here in the lab were a few PD-4 product detectors. The AMP-4 needs a good 12 to 14 volt supply at several hundred mA that doesn't exist in an R-4B.

I must report with great shame that I have two MS-4s and I hooked one of them to my badly wounded ICOM IC-735. Discraseful, it is like Queen Camilla turning to prostitution to pay her cellphone bill.

I don’t know how it can read 1.3 MHz if not oscillating… Yes, the lo band VCO should change frequency if you pill RFC502 to ground, pulling the varactor drive from ~21 volts to zero volts. Gary

Hi Glenn, In 2022 there was an attempt to have Harbach Electronics offer the boards and a parts kit. My old Gerber files were not readable by most current PCB programs. A ham in Germany was able to

Do you mean on the low VCO will drop as I don’t think the high VCO is oscillating as it reads 1.3 mhz and dies not change when I put a ground on RFC 505. Also those voltages on the test pint do not

VE7PS via groups.io writes: That's the problem with MS-4s. They accrete in corners and under tables, out of visible sight lines. It wasn't until a couple of months ago I discovered I had four of the

Lyndon... Yeah I thought about that MS-4 and if we had met at a fleamarket I probably WOULD have picked it up...but shipping adds silly cost now and thought better of it. I'll take a look next weekend

Lyndon....."Just tryin' to hep folks is all". I built a stash of many different C-J connectors used in Drake gear about 25 years ago on my visits to a customer in Regina. B & E Electronics is still

Lyndon VE7TFX writes: As a consolation prize, you could buy the MS-4 I have listed on the same site. I want that thing out of here! I need the space back ... --lyndon