Aerotron-Repco Information Index

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Information and Modifications
Compiled and HTML'd by Mike Morris WA6ILQ
Web page formerly maintained by Robert Meister WA1MIK (SK)
Currently maintained by Mike Morris WA6ILQ
I know nothing about this equipment so please go ask on the Repeater-Builder mailing list!

CONTRIBUTIONS TO THIS PAGE ARE WELCOME!
Actually to any page at this web site! (even one that just points out a typo).

The name Aerotron was trademarked in early 1962 and used by Aeronautical Electronics, Inc. which also went by Aerotron Aircraft Radio Inc. Later they merged with Repco to form Aerotron-Repco. Aerotron made land mobile, railroad and both aaircraft voice and navigation radios and transponders. The equipment was very well designed and built; too bad their marketing left a LOT to be desired. The company, based in Raleigh, North Carolina, has been out of business for decades. The AEROTRON trademark (one of many) was alowed to expire in 1987. I would imagine that all of their documents and drawings have been relegated to a landfill somewhere. The equipment and parts were sold off long ago. Any support information would have to be obtained from the web.

If anyone would like to compose a historical or descriptive paragraph or four we'd be happy to put it/them here.

The later Aerotron radios were programmable either wirh PROM / EPROM chips. If anyone would like to contribute Aerotron programming information, programs or schematics we'd be happy to put it/them here.

The various Aerotron models that I've been able to identify include: (this list is here so someone searching for info will land here and find out that they have an orphan)

123, 200, 200-A, 1037, 1075, 1259, 1292, 1938, 1939, 2314, 2323, 367, 500, 500-A, 500-B, 500-C, 500-CD, 600, 625, 625U, 70, Aerocom 7, Aerocom 8, Aerocom 9, AirPower, Alpha 1700, APC, Companion, Concept, Dimension, MEGA, MPAC-2, MPAC-6, MPAC-7, MRT-6, PAC 2, Packset, Slimline, Unicall, Unitracer (pager).

Donated Information and Modifications

MPAC UHF Base Station Receiver, part 1 of 4 Donated by Don Ritchie K8ZGW 2.9 MB PDF file.

MPAC UHF Base Station Receiver, part 2 of 4 Donated by Don Ritchie K8ZGW 2.7 MB PDF file.

MPAC UHF Base Station Receiver, part 3 of 4 Donated by Don Ritchie K8ZGW 7.1 MB PDF file.

MPAC UHF Base Station Receiver, part 4 of 4 Donated by Don Ritchie K8ZGW 1.6 MB PDF file.

MPAC UHF Base Station Transmitter, part 1 of 3 Donated by Don Ritchie K8ZGW 3.7 MB PDF file.

MPAC UHF Base Station Transmitter, part 2 of 3 Donated by Don Ritchie K8ZGW 5.2 MB PDF file.

MPAC UHF Base Station Transmitter, part 3 of 3 Donated by Don Ritchie K8ZGW 6.1 MB PDF file.

MPAC Test Set This manual covers both the portable and rack mount versions. This design is rather interesting - it has an oscillator in the IF frequency for tuning and netting crystal-based radios. 1.45 MB PDF file.

Rodger Williamson N4NRW has a complete manual for MPAC VHF rack mount. It includes schematics, parts list, service information, X-ray PCB views, etc. He is willing to provide copies of limited sections of the manual for those in need. Contact him directly at: his-callsign [ at ] arrl [ dot ] net.

1045 Power Supply 708 kB PDF Manual courtesy of Jerry Matthews WAØUZI, scan courtesy of Tim Peters K6TVP

1259 Tone Control Panel 13.2 MB PDF Manual courtesy of Jerry Matthews WAØUZI, scan courtesy of Tim Peters K6TVP

C111 Control Head 2.3 MB PDF Manual courtesy of Jerry Matthews WAØUZI, scan courtesy of Tim Peters K6TVP

UNICALL manual 19 MB PDF Manual courtesy of Jerry Matthews WAØUZI, scan courtesy of Tim Peters K6TVP
Has info on the 1044 tone panel, 1180 tone decoder, 1189 UNICALL, 1190 / 1191 four tone encoder, 1192A tone encoder, 1194 subaudible tone encoder / decoder, 1197 four tone expander and some service bulletins.

Aerotron/Repco Dimension VHF and UHF Repeaters Contains the schematic, service and alignment chapters for the 10w and 35w high band and UHF units. Donated by Andrew Pepper KC2EUS. 830 kB PDF file.

Aerotron/Repco Handwritten Notes on crystal formula and COS circuit. Donated by Mike KA2NDW 696 kB PDF file.

Aerotron/Repco Flier on VHF, UHF and 900 MHz RDL Link Radio Modules. Donated by Micheal Salem N5MS 704 kB PDF file.

Aerotron/Repco RDL Link Radio Module Pages. Donated by Micheal Salem N5MS 334 kB PDF file.

Aerotron/Repco 150 MHz RDL Link Radio Module Manual. Donated by Skipp 1.49 MB PDF file.

Aerotron/Repco 450 MHz RDL Link Radio Module Manual. Donated by Skipp 1.79 MB PDF file.

Aerotron/Repco 900 MHz RDL Link Radio Module Schematics. Donated by Micheal Salem N5MS 166 kB PDF file.

Technical manual on the Aerotron Mega-E synthesized low band radio 8.2 MB PDF file. John Harrington W5EME originally donated it in 2000 but the file wouldn't open, and emails to him bounced (I was hoping to get an article on converting the synthesizer to 5 kHz spacing). He wrote:
My local club recently came into a bunch of Aerotron Mega-E 100W LB synthesized trunk-mount radios, and it fell to me to get them on six meters. Since the radios were the high-split jobs and I had an instruction manual, after much gnashing of teeth and a totally inappropriate amount of cursing, I got them on 52.525. They work surprisingly well, 100W out and average 0.2 microvolts sensitivity. I ALMOST understand how to program the EPROMs for any frequency within 6 meters, but presently can only program frequencies within 100 kHz or so of 52.525 MHz (the national simplex freq.). Since I had to convert the synthesizer to 5 kHz spacing (the radio normally only uses 10 or 12.5 kHz channel spacing) the formulas in the book don't work anymore. Has anyone done this before who can help me with an algorithm good for 5 kHz spacing?

Also, the radios are equipped with a 16-channel "public service" control head, type 1292. This head has a scan function, but I need a book to show me how to program it to scan selected channels, pick a 'priority' frequency, etc. As it stands now, without programming, the scan, priority, aux1 and aux2 buttons don't do anything but light up when pushed. If anyone has a book on this control head, I'll gladly pay to have it copied and sent to me.

Jerry Coffman WB5RUA sent in a good 8.2 MB PDF copy in June 2007. He wrote:

I also added my estimation for hexadecimal numbers for the 6 meter frequencies, but make no promises they will work. Maybe someone could verify these and create us a little computer program to create a binary file to burn to the EPROM for 6 meters?

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This page first created a long, long time ago in a galaxy far, far away.

This web page, this web site, the information presented in and on its pages and in these modifications and conversions is © Copyrighted 1995 and (date of last update) by Kevin Custer W3KKC and multiple originating authors. All Rights Reserved, including that of paper and web publication elsewhere.

Donated Information and Modifications
	MPAC UHF Base Station Receiver, part 1 of 4 Donated by Don Ritchie K8ZGW 2.9 MB PDF file.
	MPAC UHF Base Station Receiver, part 2 of 4 Donated by Don Ritchie K8ZGW 2.7 MB PDF file.
	MPAC UHF Base Station Receiver, part 3 of 4 Donated by Don Ritchie K8ZGW 7.1 MB PDF file.
	MPAC UHF Base Station Receiver, part 4 of 4 Donated by Don Ritchie K8ZGW 1.6 MB PDF file.
	MPAC UHF Base Station Transmitter, part 1 of 3 Donated by Don Ritchie K8ZGW 3.7 MB PDF file.
	MPAC UHF Base Station Transmitter, part 2 of 3 Donated by Don Ritchie K8ZGW 5.2 MB PDF file.
	MPAC UHF Base Station Transmitter, part 3 of 3 Donated by Don Ritchie K8ZGW 6.1 MB PDF file.
	MPAC Test Set This manual covers both the portable and rack mount versions. This design is rather interesting - it has an oscillator in the IF frequency for tuning and netting crystal-based radios. 1.45 MB PDF file.
	Rodger Williamson N4NRW has a complete manual for MPAC VHF rack mount. It includes schematics, parts list, service information, X-ray PCB views, etc. He is willing to provide copies of limited sections of the manual for those in need. Contact him directly at: his-callsign [ at ] arrl [ dot ] net.
	1045 Power Supply 708 kB PDF Manual courtesy of Jerry Matthews WAØUZI, scan courtesy of Tim Peters K6TVP
	1259 Tone Control Panel 13.2 MB PDF Manual courtesy of Jerry Matthews WAØUZI, scan courtesy of Tim Peters K6TVP
	C111 Control Head 2.3 MB PDF Manual courtesy of Jerry Matthews WAØUZI, scan courtesy of Tim Peters K6TVP
	UNICALL manual 19 MB PDF Manual courtesy of Jerry Matthews WAØUZI, scan courtesy of Tim Peters K6TVP Has info on the 1044 tone panel, 1180 tone decoder, 1189 UNICALL, 1190 / 1191 four tone encoder, 1192A tone encoder, 1194 subaudible tone encoder / decoder, 1197 four tone expander and some service bulletins.
	Aerotron/Repco Dimension VHF and UHF Repeaters Contains the schematic, service and alignment chapters for the 10w and 35w high band and UHF units. Donated by Andrew Pepper KC2EUS. 830 kB PDF file.
	Aerotron/Repco Handwritten Notes on crystal formula and COS circuit. Donated by Mike KA2NDW 696 kB PDF file.
	Aerotron/Repco Flier on VHF, UHF and 900 MHz RDL Link Radio Modules. Donated by Micheal Salem N5MS 704 kB PDF file.
	Aerotron/Repco RDL Link Radio Module Pages. Donated by Micheal Salem N5MS 334 kB PDF file.
	Aerotron/Repco 150 MHz RDL Link Radio Module Manual. Donated by Skipp 1.49 MB PDF file.
	Aerotron/Repco 450 MHz RDL Link Radio Module Manual. Donated by Skipp 1.79 MB PDF file.
	Aerotron/Repco 900 MHz RDL Link Radio Module Schematics. Donated by Micheal Salem N5MS 166 kB PDF file.
	Technical manual on the Aerotron Mega-E synthesized low band radio 8.2 MB PDF file. John Harrington W5EME originally donated it in 2000 but the file wouldn't open, and emails to him bounced (I was hoping to get an article on converting the synthesizer to 5 kHz spacing). He wrote: My local club recently came into a bunch of Aerotron Mega-E 100W LB synthesized trunk-mount radios, and it fell to me to get them on six meters. Since the radios were the high-split jobs and I had an instruction manual, after much gnashing of teeth and a totally inappropriate amount of cursing, I got them on 52.525. They work surprisingly well, 100W out and average 0.2 microvolts sensitivity. I ALMOST understand how to program the EPROMs for any frequency within 6 meters, but presently can only program frequencies within 100 kHz or so of 52.525 MHz (the national simplex freq.). Since I had to convert the synthesizer to 5 kHz spacing (the radio normally only uses 10 or 12.5 kHz channel spacing) the formulas in the book don't work anymore. Has anyone done this before who can help me with an algorithm good for 5 kHz spacing? Also, the radios are equipped with a 16-channel "public service" control head, type 1292. This head has a scan function, but I need a book to show me how to program it to scan selected channels, pick a 'priority' frequency, etc. As it stands now, without programming, the scan, priority, aux1 and aux2 buttons don't do anything but light up when pushed. If anyone has a book on this control head, I'll gladly pay to have it copied and sent to me. Jerry Coffman WB5RUA sent in a good 8.2 MB PDF copy in June 2007. He wrote: I also added my estimation for hexadecimal numbers for the 6 meter frequencies, but make no promises they will work. Maybe someone could verify these and create us a little computer program to create a binary file to burn to the EPROM for 6 meters?