"ARC-5" Command Set Transmitter Pin-outs

[Ed Sharpe]

David and others,
We have one of the transmitters that covers part of the broadcast band.
WHat was the purpose of this transmitter? It seems you very seldom see
these
compared to the other transmitters that cover the other bands.

Thanks Ed Sharpe archivist for SMECC

David Stinson wrote:

> (Copied to the list for general information)
>
> One of the "good guys" wrote:
>  Dave -
>
> > You said that the Navy Transmitters were different beasts.
> > I assume that means that the power connector on the back of this
> > transmitter isn't the same as the ARC-5....
>
> The Command Set transmitters come in several "flavors,"
> all of which people sometimes incorrectly lump under "ARC-5."
> The ATA/ARA units and SCR-274N (BC-4xx, -696) units are
> nearly electrically identical and will fit and work
> in each other's racks.  The later AN/ARC-5 units
> are different in several ways,
> including a different power plug with different pin-outs.
> ----------------
> Transmitter Plug Pin-out:
> (Note: If yours has an octal socket or anything
>  other then the 7-pin Mica connector,
>  then it's a modification and all bets are off.)
>
> For AN/ARC-5-
> There are seven pins.  The pin in the center is
> pin #7.  Locate the pin that is grounded
> to the chassis.  This is pin #4.
> Count the others *clockwise* around accordingly.
>
> 1.  No Connection
> 2.  +200VDC for the Osc. (needs to be right for stability).
> 3.  Keying Relay (ground to key).
> 4.  Ground.
> 5.  A+ 24-28 VDC.
> 6.  PA Screen Voltage (use 20K 5W dropping res. from B+).
> 7.  PA Plate B+ Voltage +550VDC (not critical)
>
> For ATA/ARA and SCR-274N:
> There are seven pins.
> The pin in the center is pin #7.
> Locate the pin that is grounded
> to the chassis.  This is pin #1.
> Count the others *clockwise* around accordingly.
>
> 1.  Ground
> 2.  Test point for PA grid current.
> 3.  +200VDC for the Osc. (needs to be right for stability).
> 4.  PA Screen Voltage (use 20K 5W dropping res. from B+).
> 5.  Keying Relay (ground to key).
> 6.  A+ 24-28 VDC.
> 7.  PA Plate B+ Voltage +550VDC (not critical).
> ----------------------------
>
> 73 OM DE Dave Stinson AB5S
> arc5 at ix.netcom.com
>
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