[Milsurplus] RCA mechanical filter, was Boulevard Receiver

[wf2u at ws19ops.com]

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


Quoting Jim Whartenby <antqradio at sbcglobal.net>:

> Strange to hear that an RCA designed receiver would use Collins
> mechanical filters.  I believe RCA had mechanical filters in receivers
> long before Collins.  The RCA AN/ARC-21 uses two IIRC.
> Jim
>
> --- wf2u at ws19ops.com wrote:
>
>
>> Then there is my later model triple-conversion RMCA AR-8516 marine
>> receiver with Collins mechanical filters (1950's) which is an AC/DC
>> receiver. It's one of the best receivers in my collection.
>> The British Marconi Atalanta marine receiver (double conversion,
>> 1960's) is an AC/DC receiver as well. There is an optional factory
>> power supply installed in mine, but it just provides isolation from
>> the line and rectifies the AC.
>> It is also an excellent professional receiver.
>>
>> 73, Meir WF2U,
>> Landrum, SC
>
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