[Collins] module identification

[Dr. Gerald N. Johnson]

I'd think servo amp for an HF automatic antenna tuner or HP few hundred 
watt PA both used in aircraft where 400 Hz AC is common because motors 
and transformers for 400 Hz can be a lot lighter than 60 Hz motors and 
transformers. Could be military or civilian and some Collins HF gear was 
used with little change for commercial and for military applications, 
sometimes just the military version was in an enclosure suitable for 
very high altitudes without being in a pressurized cabin.

The Collins Equipment Listing that I found on line somewhere a few years 
back (says not to be disclosed) dated 1 May 1986 Collins Division of 
Rockwell 074-0076-000 says:
AM1525A/ARC58 528-0022-005 Amplifier ARC58 division 247 (which was the 
HF Communications Division at Cedar Rapids) PCID 26 says the same 
division, Engineer in charge R. E. Duff and it was manufactured in Cedar 
Rapids. There is an ID for group within the division but its not 
defined. PCID means Profit Center ID. SP stands for System Product Code 
99 in this case meaningful only with PCID.

On 9/3/2014 7:29 PM, antqradio at sbcglobal.net wrote:
> Glenn
> I would think that any amplifier using 400 cycle is a servo control amplifier.
>
> The AM-1522 and the AM-1734 are two that are used in the ARC-58 and 310F-1 and both have the dimensions, the two pots, three test points and PCB connector that you mention.  The only difference between these two is the power rating of the servo motor.  One of the pots should control amplifier gain and the other controls the hunt dampening.
>
AM1522/ARC58 has all the same identification except for part number 
522-0586-004.

AM1734 is also the same except for part number 522-0957-004

So they should be covered in detail in the ARC58 maintenance manual. I 
used to have one, but Jim bought it last February.

It could be that different amplifiers were used at different times in 
the production run of the ARC58 and maybe for the auxiliary tuner rather 
than the driver or the PA tuning and loading. This list shows at least 
15 different AM15xx modules in the ARC58, a DC amp, an AC amp, a couple 
RF amps, frequency multipliers and otherwise not specifically identified.

> I can sent pictures if you like.
> Jim
>
73, Jerry, K0CQ, Technial Adviser to the Collins Radio Association

________________________________
>   From: Glenn Little<glennmaillist at bellsouth.net>
> To: collins at mailman.qth.net
> Sent: Wednesday, September 3, 2014 2:44 PM
> Subject: [Collins] module identification
>
>
> A Collins module followed me home from the Shelby hamfest.
> It is marked AM-1525A/URC  528-0022-005.
> What little I could find on it is that it is an electronic control amp.
> It has FSN 5895-00-827-4272 and 5895-00-583-0801and used 110 VAC 400 CPS power.
> What equipment is this from?
> Does anyone need one?
> Size is 4.5"x2.5"x3.25".
> It has a single double sides 12 contacts per side PCB connector on the bottom.
> The top has 3 tip jacks and access to 2 pots.
> It is held in the parent equipment by two red painted screws on
> diagonally opposite corners.
>
> Any data appreciated.
>
> 73
> Glenn
> WB4UIV
>
>