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Kodiak Alaska Military History



The official web site of the Kodiak Military History Museum


1955 Pillar Mountain Microwave

Specifics on the Pillar Mountain Relay Site (1955)

Background in the picture was positively identified and placed the microwave site on Pillar Mountain at the location of the old White Alice tech control building. The site pre-dates the White Alice communications effort and was accessible via the old military road from Swamp Acres (Army Power Plant).

The tower has been identified as an AB-216/U. Typically 78 feet in height.

A close look at the antennas indicate that the antenna array is part of the AN/TRC-29 radio set.

	Specifics on the AN/TRC-29:  
	1700 to 2400 MHz microwave.
	27 RF channels spaced 25 MHz apart.
	Bandwidth: 9MHz (9000F9).
	It can handle TV, radar, FDM, TDM and Orderwire communications depending upon configuration.
	Uses an 8ft 30db wire mesh dish antenna.  100 mph wind loading without ice.
	Transmitter rack: 26.5 x 27 x 60 inches at 517 lbs.
	Receiver rack: 26.5 x 27 x 60 inches at 534 lbs.
	Power requirements: 115/230 volts AC, 50-60 Hz at 2300 watts.
	Transmission line: CG-1013/U (Surface Wave Transmission Line) for lengths 100ft and over.
The AN/TRC-29 radio system is part of an overall system, which can not be identified from the picture. So here are the configurations.

All configurations except the AN/TRC-38 are limited to 20 hops.

AN/TRC-38, Point to Point microwave system
 Two AN/TRC-29 radios
 One operational, one spare
 Orderwire capable
 One or two AN/TCC-13 multiplexer
  Each MUX capable of 23 channels
 	
AN/TRC-39, Baseband repeater system
 Three AN/TRC-29 radios
 Two operational, one spare
 Orderwire capable
 	
AN/TRC-40, Multi-hop repeater system
 Three AN/TRC-29 radios
 Two operational, one spare
 Orderwire capable
	
AN/TRA-10 Pulse form restorer (used on 5th or 6th hop)
	
AN/TRC-41, Multi-hop repeater system with drop/insert capability
 	
Three AN/TRC-29 radios
 Two operational, one spare
 Orderwire capable
 	
AN/TRA-10 Pulse form restorer (used on 5th or 6th hop)
 	
AN/TCA-1 Drop and insert for channels 1 thru 8.
Compiled by: Curtis Law 30 June 2013


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