[ARC5] Now for some AN/ARC-21 Info

[Meir WF2U]

The RT-91/ARC-2 is a 2 - 9 Mhz (in 1 MHz bands) AM/CW transceiver manufactured by Collins. It uses the usual Collins conversion scheme of a variable IF  and a fixed conversion oscillator. The difference in this case is that the variable IF is not converted down to a fixed IF. This makes the receiver section quite broad as except for a multisection tuning of the variable IF  doesn't provide much selectivity (if I recall without the manual being in front of me, the IF tunes from 0.5 to 1.5 Mhz) On CW therefore there is no traditional BFO but a 0.5 to 1.5 Mhz tracking oscillator ganged to the VFO. For transmit the conversion is done in reverse to get the output frequency equivalent to the receive frequency. The transceiver also has the traditional Collins presettable, motorized channel system with 8 channels.
My completely original, stock ARC-2 run from 28 VDC with the original, internal dynamotor puts out 40 w on both  AM and CW. The finals are a pair of 1625's, modulated by another pair. On CW I use it with an external active tuneable audio filter to make it usable even under fairly crowded band conditions. On AM it is hard to avoid adjacent stations bleeding through when propagation is longer than local. It is a neat radio, though... Here is a short description and photos of it here:
http://www.radiomilitari.com/arc2.html .

73, Meir WF2U
Landrum, SC

On May 30, 2016 2:58:43 PM EDT, Scott Johnson <scottjohnson1 at cox.net> wrote:
>The ARC-2 is really a low power command set, although I don't know if
>it was
>used as such.  The ARC-39 is also an example of an all-in-one package
>for
>command comms.
>
> 
>
>Scott V. Johnson W7SVJ
>
>5111 E. Sharon Dr.
>
>Scottsdale, AZ 85254-3636
>
>H (602) 953-5779
>
>C (480) 550-2358
>
>scottjohnson1 at cox.net <mailto:scottjohnson1 at cox.net> 
>
>scott.johnson at ieee.org <mailto:scott.johnson at ieee.org> 
>
> 
>
>From: ARC5 [mailto:arc5-bounces at mailman.qth.net] On Behalf Of Robert
>Eleazer
>Sent: Monday, May 30, 2016 11:56 AM
>To: arc5 at mailman.qth.net
>Subject: [ARC5] Now for some AN/ARC-21 Info
>
> 
>
>What about the RT-91/ARC-2? There are even couple for sale on ebay
>right
>now.  Where does that fit in the aircraft HF world?
>
>
>Wayne
>
>WB5WSV 
>
>
>
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-- 
Sent from my Android device with K-9 Mail. Please excuse my brevity.
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