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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

VE7PS via groups.io writes: Stop absconding with my connectors! (I already mailed him and beat you to it! :-) --lyndon

I have no connection with the seller, other than I used to live in Elliot Lake, ON 40 years ago, but this price looks pretty good to me. Caveat Emptor! 73 Peter VE7PS ---------- Forwarded message

Those voltages will inly read correctly if the PLL loop is closed. Do you have enough extenders to put the radio into operating condition? The way you have it operating, the output at the test point

Hi Rob; You wrote, " My MIX-4 has a J309 FET properly coupled to the 5695 kHz IF tuned circuit, and separate ports on the NE602 Gilbert Cell mixer for the IF and the LO injections" Have you given

Hi Gary, I did the ground on RFC505 and no change except that the voltage goes very low of course going through a 100K resistor. The frequency counter shows 1.3 MHz on the output of the VCO when it is

Thanks Stan. So yours is 69 units newer than mine, and has the standard board. I wonder how I ended up with this one? Hopefully a few more data points will come in and help settle this (whether it's a

One of my rules is to never leave vintage gear running unattended, even for "just a minute". "Jay W6CJ via groups.io" <lastradioman@...> wrote: -- 73 -Jim NU0C