MT-1029 power control options

MT-1029 power control options

Power to radios RT-246 or RT-524 can be controlled from two different sources depending on how the connector assembly is wired.  The photo above is for the later style connector assembly where the fuse was omitted and the terminal
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MK-1978 MANUAL TM 11-6625-2971-14 FEB 1983

I NOW HAVE TM 11-6625-2971-14 AVAILABLE AS A PDF FILE.
THIS IS THE COMPLETE MANUAL FOR THE MK-1978 AND MK-1978A MAINTENANCE KIT FOR VRC-12 SERIES RADIOS. 
EMAIL IF YOU NEED A COPY.  
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Vehicle Antenna's

I have been adding some vehicle antennas to the store and wanted to add some information about what can be a confusing subject.
This article is addressing the standard VHF FM tactical antennas used with the AN/VRC-12 and Sincgars radio sets.
When the AN/VRC-12 was introduced it used the AT-912/VRC antenna set.  This was also called the "box base" antenna because the antenna matching unit is rectangular in shape.  
The height of the antenna is about 9 foot, and due to the size it was made with two elements.  These elements are sections of metal in fiberglass and epoxy.  The antenna elements for this set are AT-1095/VRC and AT-1096/VRC.  The lower element screws into the matching unit and the upper element then screws into the lower element.  So far not complex.  
Then someone had a better idea.  Not many years after the fielding of the AT-912, the AS-1729/VRC came out as a replacement.  The earliest info I can find on this set is a TM from August 1966.  The general idea is the same as the AT-912, a matching unit and two elements.  This matching unit, the MX-6707, is called the "round base" because it fits into a round hole for mounting to the vehicle. 
That round hole has been standardized, and is just under three and half inches in diameter.  
Now, over 50 years since the AS-1729 antenna was first fielded there a number of antennas that look similar,  fit into the same antenna mount brackets, and have fiberglass antenna sections.  Some pieces fit another set, some do not, and some may work with a set they are not made for.  

This is the best I can figure out, subject to change, errors and learning more.  I have dropped the /VRC part of the nomenclature.

Antenna Set    Matching Unit          Lower Element          Upper Element          Notes

AT-912             MX-2799                   AT-1096                      AT-1095                     Not "round"  

AS-1729          MX-6707                   AS-1730                      AT-1095                     First "round" antenna

AS-2731          MX-9146                   AS-2732                      None

AS-3885          01-2731074             87W573                      87W535                     MSE

AS-3684          A3013832-1            A3013843-1               A3013432-1              SINCGARS

AS-3900          A3013298-1            A3018230-1               A3017901-2              SINCGARS

AS-3900A        A3017899-2            A3018230-1               A3017901-2              SINCGARS

AS-3916           A3207487-1            A3207497-1                NONE                         SLPA STEEL WHIP    

AS-1729 AND AS-3885 WILL INTERCHANGE ALL PARTS PHYSICALLY.  UNKNOWN IF THEY WILL WORK WELL.
AS-3684 AND AS-3900 WILL INTERCHANGE ALL PARTS PHYSICALLY.  THEY APPEAR TO WORK OK.  

MORE ON THIS SUBJECT LATER.                                    
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Welcome

Welcome to our online store! We are now open for business, and I look forward to serving you all in the future. If you have any questions about this store or the products found within, please don't hesitate to contact me any time. This website has been carefully designed to provide you with an amazingly flexible online shopping experience, and its ease of navigation is something we think you'll grow to depend on and appreciate. Feel free to browse our entire product catalog, and let us know if you have any questions, comments or concerns about the items housed within. I am always ready and willing to assist customers, and are happy for your visit.Thanks, Steve
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