[Milsurplus] RCA mechanical filter, was Boulevard Receiver

[D C *Mac* Macdonald]

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