Karl's Link Radio page

This page is all about modifying radio equipment for a better way to pass signals for long-distance links and other uses, starting with the COR/Audio board. Several versions were designed however, not produced. Your main starting point will be version 5.3.

My COR board project:

COR/Audio board Ver. 5.3 Updated 7/6/03, 3/29/04, 8/27/05, 6-25-06, 4-10-09

COR/Audio board Ver. 5.4 For Downlinks

COR/Audio board Ver. 5.5 For Uplinks only

COR/Audio board Ver. 6.0 Designed for a conventional repeater (single site).(alpha-not produced)

COR/Audio board Ver. 6.1 Designed only for mitrek, in place of PL deck.(beta-in prototype stage)

COR/Audio board Ver. 6.2 Designed only for mitrek, in place of PL deck.(beta-in prototype stage)

Version 6.3-for the Mitrek radio PDF

COR/Audio board Ver. 7.0 Designed only for mitrek and micor link radios.(alpha-not produced)

COR/Audio board Ver. 7.1 Designed only for mitrek, possibly in place of PL deck.(alpha-not produced)

COR/Audio board Ver. 7.2 Designed only for mitrek, in place of PL deck.(alpha-not produced)

COR/Audio board Ver. 7.3 Designed only for mitrek, in place of PL deck.(alpha-not produced)

Version Chart Quick comparison charge for different versions over the years.

Motorola Mitrek area - Lot's of information

Most of these documents are in PDF for easy viewing with any O/S. Also, some of them are large in size:

Mitrek conversion to Repeater or link in PDF

Details on the antenna conections in PDF

Frequency options in PDF

Details on the casting in PDF

Operation manual in PDF

Motorola Micor area - Lot's of information

Micor transmitter for repeater service in PDF

Suppliment for above in PDF

Micor receiver converstion in PDF

Micor receiver converstion Notes

Micor squelch theory in PDF

Other equipment

MX-350 Portable Radio for links Used in some SRG 20 repeater links

GE for repeater operation in PDF

Audio Standards Flat or conventional audio and level standards

Microphone discussion

Direct F.M. a Midland 13-509, or most any transmitter

Midland 13-509 Full story on F.M. and repeater conversions for 1 1/4 meters

Wilson 1 1/4 meter radio For the model T2202SM HT.

Johnson PPL6060 UHF radio notes Improving transmitter frequency stability

Fan assembly to cool a transmitter Used in some SRG 20 repeater equipment

GE Mastr II repeater interfacing to a link in PDF

SRG Library Tech documents

A note about the documents; recently they are starting to be converted to PDF for a couple reasons; this solves the issue with html pages (with images) being displayed on various browsers (with other variables) and generally is smaller in file size. This is especially true for a MS-Word document (with images) compared to the size of the same document in PDF. PDFs are easy to download to your PC for later viewing.


Note: Many of these projects are in the R-n-D stage, therefore, are subject to change and improvement without notice. They are intended to get the experienced builder in the right direction and not necessarily for the beginner. Tip: Some are PDF's therefore, to save time you can right click on the link and "save as" to your PC for local (and faster) viewing.

[SRG home Direction]