[ARC5] SCR-274N transmitter mod.

[Dennis Monticelli]

I am not that caretaker, but it would be nice if copies were available
either via SASE or via a website download.  I'm quite curious what
they did.  The ARRL promoted a crystal control technique for novices
that required building a 6AG7 crystal osc on a separate small chassis
and plugging it into the 1626 socket.  Power and filament was derived
from that same socket.  After the novice upgrades to general, the 1626
returns home and the transmitter is once again stock, VFO controlled.
I wonder how many novices actually bothered to build the separate osc
and live with being rockbound to a few crystals.  Pretty tempting to
just pretend you're rockbound.  With the ARC-5's stability, you could
probably get away with that charade.  Don't look at me!  I didn't do
it.

Dennis  AE6C

On Sun, Jun 8, 2008 at 8:13 AM,  <telegrapher at att.net> wrote:
> I have unearthed a Lockheed Aircraft Service modification for the SCR-274N transmitters.  What it does is remove a couple of components an convert the calibration oscillator to a fixed frequency single crystal stage.  Says that 3105 Kc was to be installed in BC-696A and 6210 kc in the BC-458A.  This document which is the engineering drawing, heavy paper light tan in color (?) is dated March 24, 1947.  It has an official drawing number of SPD-701485 attached to it.  Probably looking for a new home with an official document caretaker.
>
> Larry
> W0OGH
> _______________________________________________
> ARC5 mailing list
> ARC5 at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/arc5
>