You're probably right , that the author was alluding to the work involved in setting up the channels and not tuning units as I envisioned it to be.

I've got 3 BC 653 xmtrs that I think I can make two good operational xmtrs.

The only experience I've had with this set and SCR 506 as a whole was restoring the 653 xmtr for Jaques Littlefield for installation in his M3A1 Scout car. The fog of time on doing this was almost 30 yrs ago so my recall on this is only it didn't take much and that the MFP treatment messed up that loading coil to were its arcing across the MFP bridging on a couple of the windings and making carbon path shorts.

I don't recall if I got on the air with it when I had it at home but but do remember it worked well. I think I did the freq tune up on 3885...but it was no big deal

Paul

N6FEG

On Thu, Jun 6, 2024, 11:30 AM Ray Fantini via Milsurplus <milsurplus@mailman.qth.net> wrote:

I am confused why in the write up on the SCR 506 that Ray quoted that it

said: "but takes the patience of Job to sort out the millions of tuning units"

What tuning units....the SCR 506 didn't use any tuning units.

The BC 191 in the SCR 193 that it replaced used a few tuning units

The radios IMO opinion that used a lot of tuning units were the GF/RU and

SCR 183/283 radios...and the BC 375 to a lesser extent but still a few.

Paul

N6FEG

Think that because the transmitter had four preset channels and for each preset there was a setting for the master oscillator, driver tuning, PA and antenna tuning that resulted in about a thousand adjustments for the preset channels. Go figure, receiver has no presets but transmitter had four? Maybe that’s because they would allow the operator to tune the receiver but not attempt to tune the transmitter due to the complexity of operation? So, the operator would tune the receiver but use preset channels for transmitting with someone further up the chain doing the transmitter tuning? Often wonder how that worked with radios like the TCS where if you had people with no idea how to tune the transmitter and how unexperienced (but often higher ranking) crew members were kept from cranking on the transmitter.

All this is speculation on the SCR-506 transmitter because I have not seen one yet.

Ray F/KA3EKH

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