[Milsurplus] RCA mechanical filter, was Boulevard Receiver

[Jim Whartenby]

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
> 
> 
> 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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