[Milsurplus] Re: APN-1 usage.. was APN-1 vs C-1

[Scott Johnson]

The altimeter referenced is a SCR-718.  High range, j-scan altimeter, used 
well into the eighties on C-13-s, although only over water, as it operated 
at 440MHz.

Scott
----- Original Message ----- 
From: "J. Forster" <jfor at quik.com>
To: <whitaker at ieee.org>
Cc: "Milsurplus" <milsurplus at mailman.qth.net>
Sent: Saturday, March 25, 2006 2:25 PM
Subject: Re: [Milsurplus] Re: APN-1 usage.. was APN-1 vs C-1


>C Whitaker wrote:
>
>> de WB2CPN
>>
>> Ol'  8403, the C-47 I bumed around in a lot, had the indicator
>> at the navigator's  position.   There was a little telescope that
>> looked down at the ground as it went under the airplane.  The
>> navigator could measure drift, and ground speed (TAS) if he knew
>> how far it was to the ground.  Hence APN-1 and its little
>> blip on the circle.
>
> The APN-1 uses a 270 degree meter as a readout. It's marked 0 to 400 or 
> 4000
> feet, depending on range.-John
>
>>  Over water an iceberg or waves driven by
>> the wind helped.   I don't think APN-1 tied into anything, except
>> maybe a minimum altitude gear warning horn.
>>
>> Of course, I could be lying.
>>
>> 73  Clete
>
>
>
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