[Milsurplus] RCA mechanical filter, was Boulevard Receiver

[wf2u at ws19ops.com]

That's also the way I know the story of these radios - that  ARC-65 is  
the updated/retrofitted for SSB AN/ARC-21.

73, Meir WF2U
Landrum, SC



Quoting D C *Mac* Macdonald <k2gkk at hotmail.com>:

>
> 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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