[ARC5] Lancaster Radio Altimeter

[Scott Johnson]

The second altimeter was likely an SCR-718 high range pulse altimeter (used
a j-scan scope to show altitude in two ranges, 0-5K, and 0-50Kft.  RT was in
a similar size case, and was in the same band near 440MHz.  FWIW, we still
had them in C-130Bs in the eighties, but they were only used over water, as
they interfered with communication below, and were of dubious value anyway.
There was also a C band follow on , the APN-133 I believe, that was
installed in the C-130E.

-----Original Message-----
From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net] On
Behalf Of J. Forster
Sent: Thursday, February 21, 2013 1:00 PM
To: Vintage-Military-RADAR at yahoogroups.com
Cc: ARC5 at mailman.QTH.net; Milsurplus at mailman.QTH.net; VMARS at yahoogroups.com
Subject: [ARC5] Lancaster Radio Altimeter

Hi,

Recently, I picked up an RCA AVA-68 Antenna Switch It is apparently used
with the AN/APN-1 Radio Altimeter on the Canadian Lancaster, but this is the
first I've ever heard of it.

The unit is DPDT coax switch with SO-239 cnnectors, operated by a rotary
solenoid mechanism.

The reference is:

http://jproc.ca/rrp/rrp3/lanc_equipment_details.html