Back to Home   Technical Information on the RLC Series of Repeater Controllers and Equipment
made by Link Corporation
Compiled by Mike Morris WA6ILQ
Web page maintained by Robert Meister WA1MIK
I know nothing about this equipment so please don't ask!

Contact Info:
  Audio Test Solutions, Inc.
4890 Vandaveer Road
Billings, MT 59101
Main Phone: 406-294-5108
Fax: 406-294-5109

Old Contact Info:
  Link Communications, Inc.
1035 Cerise Road
Billings, MT 59101-7378
Main Phone: 406-245-5002
Fax: 406-245-4889
Orders Only: 800-610-4085
  Email:     (disguised to avoid email-address-sniffing spambots)
info //at// link-comm //dot// com
For reference, Link's prior address (seen in many old manuals) was 1407 4th Ave N, Billings, Montana 59101, at the same phone numbers.

News flash:   And no, it's not an April Fools Day joke.
  March 30, 2011: Amateur Radio RLC Product Line Acquired by ATSI - Audio Test Solutions, Inc.

Link Communications, Inc. has provided high-end repeater controllers to Amateur Radio operators for over twenty-two years. In that time our business has grown from one product line up to six different product lines.

With this growth we have decided that more individual focus is needed in the RLC Product line. To further this focus ATSI - Audio Test Solutions Inc. of Billings, Montana has acquired the rights to the RLC Product Line from Link Communications, Inc. As of April 1, 2011, Link Communications will no longer be selling the RLC Product Line and it will no longer be featured on Link Communicationsí web site.
ATSI values your relationship and will be working directly with Link Communications, Inc. to insure a smooth transition for all of you in the Amateur Radio Community. For the immediate future the manufacturing aspect of the RLC products will continue to be done at the Link Communications manufacturing facility. All new sales, repairs and support will be done directly through ATSIís new web site.

ATSI - Audio Test Solutions Inc. is very excited about the acquisition of the RLC product line and has designed a new web site which is designed and dedicated specifically for the Amateur Radio enthusiasts.

Info on the products:

If you are at all serious about your Link repeater controller then you need to subscribe to one of these two Yahoo Groups (mailing lists)... Both have a large number of controller owners and if you post a request or comment you will get a response from someone, but Link has people that monitor the lists and sometimes reply to messages on each of them. They also post announcements about new firmware versions and other items of interest to both lists. covers all the Link products EXCEPT the DSP series controllers. To subscribe send a blank email message to covers the RLC-DSP series. To subscribe send a blank email message to

If you have problems, here are local (i.e. at repeater-builder) copies of a few Link-Comm repeater controller manuals:

RLC1 Repeater Controller Manual ver 1.01   83 pages, 613 KB PDF dated 25 June 1993
RLC2 V4.28 Repeater Controller Manual ver 4.28   365 pages, 1.58 MB PDF dated 14 March 1997
RLC2 V4.30 Repeater Controller Manual ver 4.30   366 pages, 1.53 MB PDF dated 18 Feb 1999
RLC3 Repeater Controller Manual ver 1.80   348 pages, 893 KB PDF dated 17 Sept 1998
RLC4 Repeater Controller Manual ver 1.79   228 pages, 526 KB PDF dated 18 Sept 1998

The serial port (computer programming connection) on the RLC-1, RLC-3 and RLC-4 all use pin 2 as the transmit data, pin 3 as the receive data, and either pin 5 or pin 9 as ground. This is a standard 9-pin serial port.

The RLC-2 uses a regular DB-9 connector hooked to a standard serial port but with a non-standard serial port pinout. You will have to make a custom cable for it. Pin 5 is ground, pin 4 is receive data, and pin 9 is transmit data. Do not connect any other pins, they are used as soft-pot connections. Once you have the custom cable made and connected the operation is normal. The communications parameters are 9600 baud, No parity, 8 bits, 1 stop bit, but you need to add an inter-character delay and an inter-line delay to the PC-to-RLC side to let it keep up with the data flow. Command 244 is provided to configure the serial port baud rate, allowing selection of 300,600,1200,2400,4800, and 9600 baud.

Link has a support Wiki page at that is worth looking at.

Click here to download the manual for the RLC-MOT "MICOR Squelch Module" (local copy here at
There is additional info, including a FAQ page, at Link's web site.
Click here to download the Tech Specs and notes for the RLC-MOT "MICOR Squelch Module" (local copy here at
Click here to download the Tech Specs and notes for the RLC-ADM "Audio Delay Module" (local copy here at
Additional Digital Outputs for the Link RLC-4 Repeater Controller By Brad Andrews KB9BPF

Neither of the two manuals below are on the Link web site - it's as if the equipment never existed.

RLC-5 Repeater Link Controller
There were two completely different designs / products and three different manuals named RLC-5. The original was a linking board and is described in the manual above. The other design was similar to an RLC-4 with built-in autopatch and DVR. Link sold it primarily for commercial applications with custom firmware, although an amateur version was available for a short time.
If anyone has a copy of either the commercial RLC-5 or the amateur RLC-5 manuals we'd like to PDF them. 1.1 MB PDF file.
RLC-6 Four Port Repeater Link Controller
This is a port expansion board that was designed for the RLC-1 prior to the RLC-4 but can be added to any controller to create additional link ports. 1.3 MB PDF file.

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This page originally posted on 30-Nov-2003

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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.