[ARC5] Radio Altimeter

[Mike Everette]

No test set manual, but I do have a complete and virginal APN-1 (except for the antennas), which I removed from a grounded C-45 Twin Beech... the r/t unit, shock mount, all connectors (cut-off from cables), indicator and altitude limit switch.

Anybody wanna fly it?

I also have my Dad's WW2 radar training manual which covers not only the APN-1 but also several more equipments, mostly IFFs and heavy-iron ASV or blind-bombing radars used in the B-29 et al.  It's a LOT of pages and many fold-out schematics.

73

Mike
W4DSE

--- On Wed, 11/28/12, J. Forster <jfor at quikus.com> wrote:

> From: J. Forster <jfor at quikus.com>
> Subject: Re: [ARC5] Radio Altimeter
> To: "Bill Fuqua" <wlfuqu00 at uky.edu>
> Cc: arc5 at mailman.qth.net
> Date: Wednesday, November 28, 2012, 10:06 PM
> The APN-1 (and Navy version)
> certainly is a clever design, and there were
> many, many thousands built. They used to be in little
> demand, but recently
> have gotten hot. The antennas, little dipoles, are much
> sought after. It
> seems to be related to TBM Avenger collectors.
> 
> It had several Test Sets, including the TS-16/APN-1. I have
> one and would
> dearly like to find the manual. Anybody got one?
> 
> -John
> 
> =========
> 
> 
> 
> >    The APN-1 always impressed me.
> > It is a very cleaver and simple radio altimeter using a
> wobbulator.
> > Now, some old times know what that is. I once had
> a  graduate student
> > from
> > Poland come  to my office and
> > ask  for a wobbulator and the technical staff
> looked at him as if he was
> > nuts, I said sure we have one
> > you may borrow. It was in the Polish to English
> dictionary he had. He
> > borrowed it for a few days and
> > returned it.
> >     It had a Continuous FM 
> transmitter and a simple vacuum tube balanced
> > mixer with an antenna
> > for each. The FM signal was sent to the ground and when
> the reflected
> > signal returned it was
> > mixed with the output from the transmitter, by this
> time it would be at a
> > slightly different frequency.
> > And this audio signal was amplified and its frequency
> measured with a
> > simple analog frequency
> > meter. The difference frequency was proportional to the
> altitude.
> >    Later they went to pulsed systems. But as
> kid I was impressed by this
> > simple but very
> > effective system.
> > 73
> > Bill wa4lav
> >
> >
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