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. If any of the drawings are not clear a better copy is available for a modest cost of handling.
My COR board project:
COR/Audio board Ver. 5.3
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 connections in PDF
Frequency options in PDF
Details on the casting in PDF
Operation manual in PDF
Motorola Micor area - Lot's of information (including Spectra-Tac)
Micor transmitter for repeater service in PDF
Transmitter supplement for above in PDF
Micor receiver conversation in PDF
Spectra-Tac supplement (goes with above document)in PDF
Spectra-Tac PL Module (goes with above document) in PDF
Micor squelch theory discussion in PDF
COR board version 5.4 for Micor Spectra-Tac downlink in PDF
COR board version 5.4 schematic in jpg
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
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.