[Milsurplus] R-249/APN-9A modified R-65A/APN-9 adding mechanical digital time delay readout

[Mike Morrow]

> Any ex military navs or aircrew ever see one of these? It was a major
> mod of the familiar R 65/APN-9 adding the ability to get a direct TD 
> readout on a Veeder Root counter rather than manually counting timing
> pips on the CRT face. 
>
> https://sites.google.com/site/apn9andpostwarvariants/

Sure.  I provided a set of manuals for it to John Forster and Robert/WA5CAB
a few years ago.

However, I never saw one when I was in the service.  I saw an R-65/APN-9
in use on the Royal Netherlands Navy destroyer Hr.Ms. Amsterdam (D819) on
which I was stationed in 1973, and I believe they were on the SH-3D Sea King
helicopters on board USS Intrepid (CVS-11) when I was stationed there in 1971.

The LORAN A set that replaced the AN/APN-9 in USAF service was the AN/APN-70.
It served along with the UASF's AN/ARC-21 HF receiver-transmitter and AN/ARR-36
HF auxiliary receiver.

I don't think many AN/APN-9A units were produced before the AN/APN-70 took over.

Mike / KK5F