[Milsurplus] RCA mechanical filter, was Boulevard Receiver

[Bob Camp]

Hi

Back when I was at Motorola, we made tone filters (very different  
things) for RCA and shipped them with RCA labels on them. Since we  
made more money on them than on the internal production, they always  
shipped first ....

Bob


On May 29, 2008, at 11:12 PM, D C *Mac* Macdonald wrote:

>
> I am not absolutely certain, but I believe that it
> may be possible that the AN/ARC-21 may have
> been retrofitted/modified to become AN/ARC-65.
>
> Mac, K2GKK
>
>
>
>
>> Date: Thu, 29 May 2008 18:32:01 -0700
>> From: antqradio at sbcglobal.net
>> Subject: Re: [Milsurplus] RCA mechanical filter, was Boulevard  
>> Receiver
>> To: Milsurplus at mailman.qth.net
>> CC:
>>
>> Don't know if RCA was involved in telephone carrier equipment, but I
>> did check the manuals for the ARC-21 and FRR-23; both of which seemed
>> to have entered production by the mid 1950s.
>>
>> There are three mechanical filters in the ARC-21, two in the signal
>> path and one used to stabilize an oscillator. They have center
>> frequencies of 300kc, 105kc and 106kc respectively.
>>
>> The FRR-23 has two, both with a center frequency of 200kc; one with a
>> pass band of 3.2kc and the other has 8kc.
>>
>> Are the mechanical filters in the AR-8516 really marked Collins?
>> Jim
>>
>>
>> --- wf2u at ws19ops.com wrote:
>>
>>> I think RCA had very low frequency mechanical filters for multiplex
>>>
>>> telephone carrier equipment, but didn't make compact mechanical
>>> filters in the hundreds of KHz frequency range, like the standard IF
>>>
>>> frequencies.
>>> The AN/ARC-21 was an AM system AFAIK, and was replaced by the
>>> AN/ARC-65 SSB system.
>>>
>>> 73, Meir WF2U
>>> Landrum, SC
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