[Milsurplus] Manual for AM-1565/URC (AN/URC-9, SRC-20,21)

[Nick England]

Photos at http://www.navy-radio.com/xmtrs/src20.htm

   The story I got (when working for NAVELEX in the early 70's) is
that they were originally designed in 1955 for landing craft - massive
construction and you can button them up watertight, in which case MTBF
is 20 hours or so - either you have the beach and can bring in
something else, or you don't and it doesn't matter any more.
  There was supposed to be another standard shipboard UHF AM rig, but
the procurement got overloaded with bells & whistles and died - so the
Navy bought 1000's of these things as a stopgap. DD's had 2 or 3 and
there were 30 or more up on the 07 level of a typical carrier.
   Reliability and maintenance was a nightmare - The URC-9 transceiver
compartment was completely sealed with air recirculated inside it. We
instrumented some and measured tube temps somewhere near glass melting
point.
   I think things eased a little when we finally convinced the powers
that be they didn't really need air-tight rigs in your average radio
room. Field Change Kit No. xx included a hole saw.

AN/SRC-20 (100 watts) 225-400mc
   AM-1565/URC amplifier
   AN/URC-9 transceiver
          RT-581/URC-9
          PP-2702/URC-9
   C-3866/SRC control

AN/SRC-21 (16 watts) 225-400mc
   AN/URC-9 transceiver
          RT-581/URC-9
          PP-2702/URC-9
   C-3866/SRC control

"A" version has  0.05mc channel spacing, "non-A" has 0.1mc channel spacing.

NAVSHIPS 0967-032-5000
NAVSHIPS 0967-125-6000
NAVSHIPS 0967-378-2000
NAVSHIPS 0967-438-9000


On Sun, May 2, 2010 at 8:47 PM,  <WA5CAB at cs.com> wrote:
> Although I used and worked on them 40+ years ago, this is one family of
> sets that I have never come across a single piece of paper on.  Or any
> hardware.  Does anyone have any manuals on any of it.  My recollection (also 40+
> years old) is that AN/URC-9 was the relatively low-powered Receiver-Transmitter
> (which I don't even know the nomenclature of).  And this is a stretch but I
> think AN/SRC-20 was URC-9 plus AM-1565 and AN/SRC-21 was SRC-20 plus some
> sort of remote control.
>
> Anyway, I just had an email from someone looking for a manual on the
> amplifier which I assume to mean that's probably all that he has.
>
> Robert Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480
> ______________________________________________________________
>