[ARC5] SCR-522: Rethinking The Old Gal

[Scott Johnson]

I have several ARC type 12 set available, some new in box.  You will need a ARC 5 type dynamotor for them, or a dynaverter.

 

Scott V. Johnson W7SVJ

5111 E. Sharon Dr.

Scottsdale, AZ 85254-3636

H (602) 953-5779

C (480) 550-2358

 <mailto:scottjohnson1 at cox.net> scottjohnson1 at cox.net

 <mailto:scott.johnson at ieee.org> scott.johnson at ieee.org

 

From: arc5-bounces at mailman.qth.net <arc5-bounces at mailman.qth.net> On Behalf Of David Stinson
Sent: Sunday, April 26, 2020 12:30 PM
To: Mike Bracey <mikebracey at att.net>; ARC-5 <arc5 at mailman.qth.net>
Subject: Re: [ARC5] SCR-522: Rethinking The Old Gal

 

The ARC-type-12 sets are a good place to start.  Much easier to 
find an unhacked one and get it going.  You need an amplified speaker.  

On 4/26/2020 2:26 PM, Mike Bracey wrote:

Hello to David and everyone.

 

I would love to have some model of command set to monitor VHF aircraft transmissions. I'm also in the DFW area and there's a lot to listen to. I was wondering what y'all would recommend as a good starter set. I like to power my sets by dynamotor. Thanks for your help.

 

73, Mike Bracey, KE5YTV, Dallas TX.

 

 

 

On Sunday, April 26, 2020, 1:49:33 PM CDT, David Stinson  <mailto:arc5 at ix.netcom.com> <arc5 at ix.netcom.com> wrote: 

 

 

On 4/26/2020 10:31 AM, Mike Morrow wrote:
>

> IMHO the SCR-522-A was the MOST important aircraft
>command set on any frequency used by any armed service
>of any nation during WWII..
>Unfortunately, its horrific complex "Rube Goldberg" push-button
>mechanical nightmare BC-602-B control box inspired
>similar control box abominations like
>the C-118/ARC-3 and C-30/ARC-5. :-)

It's not just the 602 control box.  The channel switching to the
back-a**-wards use of relays ( Antenna and B+ switch relays are
picked in receive and unpicked during TX!) to needless junction boxes
that added nothing but expense and complexity (wisely dispensed-with
in U.S. installations).  There's a relay you pick by providing ground,
so it can close a contact and provide ground to another terminal:
"Do WHAT?"  A *balanced," magnetic mic audio input; you
need an external adaptor to use a standard unbalanced carbon mike.
The manuals and schematics can't agree on the standard for showing
those relays.  Some appear to be picked, some not.  I pulled what little
hair I had left trying to cypher-out the PTT sequence in this thing to
correct a cabling error.  I think Einstein could have understood the 
diagrams
and the keying sequence- if he was having a really good day.
For a bonus, there are three different versions of the receiver with 
different
Mongolian Goat-Script and Atlantian Hyroglyphs in their individual diagrams.
Rube Goldberg would have given-up on
this electro-mechanical robo-train wreck.  I don't think the people who
designed it could explain it.

But all that being said, it is not hard to service and, once one finally 
solves
the puzzles and mysteries- like the "plain girl" at the dance, the set
has charms to reward the effort.
As Mike suggested- it was a very important and historic step in
aviation comms evolution, thus worth the effort to preserve.
When done, it will be fully operational in as-designed configuration.
If I actually live long enough to build a REAL shack where I can display
and operate my treasures, it will look awesome next to it's direct-
lineage "grandfather," the operating U.K TR9-D.

 The receiver is crystaled for the local AWOS
(Automated Weather Observation Station),
DFW Departure, the local UNICOM and for chat-around freq 123.45 MC.
The transmitter is also "Go" on two channels.   Of course, it would be
illegal and un-hammish to exchange greetings with private pilots on
this set, comment on the lovely weather and wish them a safe flight,
and hear their kind and cheerful replies.
One should never do such a thing.  Heavens, no.  Perish the thought....

GL OM ES 73 DE Dave AB5S


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