[ARC5] [Milsurplus] Interesting ARC-3

[Francesco Ledda]

FYI, I have here few NOS solid state dynamotor replacements for ARC-3.  If
interested contact me directly.

Frank
K5URG

-----Original Message-----
From: milsurplus-bounces at mailman.qth.net
[mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of Mike Morrow
Sent: Sunday, November 26, 2017 10:12 AM
To: ARC-5; milsurplus at mailman.qth.net
Subject: Re: [Milsurplus] [ARC5] Interesting ARC-3

There was the 8-channel R-77()/ARC-3, the 16-channel R-428()/ARC-36, and the
48-channel R-608()/ARC-49.  Now this.

This appears to be a commercial or other-country aftermarket modification of
an original R-77//ARC-3 (without the never-issued guard receiver IF input
connector of R-77A and later).  It obviously has three banks of eight
crystals arranged under the metal blank cover, and the photo of the receiver
with the top removed shows the added shelf with the three crystal bank
select relays.  The crystals are much smaller than the original CR-1A/A,
likely similar to the CR-18/U used in the 48-channel R-608/ARC-49.  Three
crystals would be associated with each LO harmonic select dial, just as
there were two crystals in the R-428 and six crystals in the R-608.

The crystal select control box looks more commercial-service than military,
yet the entire modification is way beyond ham hack quality.

It's too bad that there are no photos of a nomenclature plate that might
indicate the source of the modification.

Interesting variation, Dave.  Thanks for posting, and including the link and
enough info to make going there worthwhile.

If the AN/ARC-3 had a guard channel, and been built in one box, it would
have been the perfect WWII command set.  It's a very innovative true
auto-tune system.

Mike / KK5F

-----Original Message-----
>From: David Stinson <arc5 at ix.netcom.com>
>Sent: Nov 26, 2017 8:36 AM
>
>This is an interesting ARC-3 variant. 
>24 channels, but where do the crystals go?
>The original 8-channel sockets are blocked with a plate.  Are the 
>crystals in the control box?
>
>https://www.ebay.com/itm/292343727195
>
>73 OM DE Dave AB5S
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