[Test-Equipment] question

[Richard Knoppow]

----- Original Message ----- 
From: "J. Forster" <jfor at quik.com>
To: "Discussion of Electronic Test Equipment" 
<test-equipment at mailman.qth.net>
Sent: Sunday, December 13, 2009 12:13 AM
Subject: Re: [Test-Equipment] question


> It was used with the A, N beacon system. One side of the 
> heading you heard
> Morse As, the other side, Ns. On the beam you heard a 
> steady tone, the
> result of ORing A & N in Morse.
>
> -John
>
     The purpose of the filter was to separate the tone 
modulation used for the A/N guide from any voice 
transmission. The airways beacons also frequently had 
weather information on them via voice. The filter allowed 
selection of either voice or tone or both.
     I am not sure when the range beacons were discontinued 
in favor of much more sophisticated methods but they were in 
use for probably thirty years. The filters had nice toroid 
inductors in them which could be used for other things like 
RTTY filters.


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com