[Test-Equipment] question

[Tom Frobase]

Richard Knoppow wrote:
> ----- 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.
>
> I have a couple of 1620C here but I never have had the detectors for them.  Is there a DIY detector project out there they seem to be so expensive on eBay ... tom, N3LLL
> --
> Richard Knoppow
> Los Angeles
> WB6KBL
> dickburk at ix.netcom.com 
>
> ______________________________________________________________
> Test-Equipment mailing list
> Home: http://mailman.qth.net/mailman/listinfo/test-equipment
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Test-Equipment at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>