[Collins] module identification

Thu Sep 4 01:27:25 EDT 2014

Glenn and Jerry
OK, drug out the ARC-58 manual and found that the AM-1525A / URC controls the power amplifier servo motor in the T-605 / ARC-58 linear amplifier.  There is a second servo system which uses an AM-1733 / URC which controls the driver amplifier tuning motor also in the T-605. 

The modules I referenced earlier are in the receiver-exciter R--761 / ARC-58.  One for the SMO and the second for the RF Tuner.  The 310F-1 is essentially a rack mounted 120 volt, 60 cycle powered R-761 and it also has a motor-generator to produce the 400 cycles needed for the auto tune function.
Jim

________________________________
 From: Glenn Little <glennmaillist at bellsouth.net>
To: collins at mailman.qth.net 
Sent: Wednesday, September 3, 2014 11:08 PM
Subject: Re: [Collins] module identification

Thanks for the help.
I will not disassemble  the amplifier as there may be a use for it.
I will look for the diagram now that I know that it is p/o ARC-58.
It is real nice to have all this expertise and willingness to help.

73
Glenn
WB4UIV

At 10:40 PM 9/3/2014, Dr. Gerald N. Johnson wrote:
>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
>>
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