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QRP Related Equipment Modification Articles

Most of these articles have appeared in the ARCI QRP Quarterly.
Many of the ideas presented can be applied to other projects.

Modified Index Labs QRP-PLUS

QRP-PLUS Modifications and Improvements by Larry East, W1HUE
Part 1: Receiver Modifications (January 1997 ARCI QRP Quarterly)
Part 2: Transmitter Modifications (April 1997 ARCI QRP Quarterly)
Part 3: Notes and Corrections (July 1997 ARCI QRP Quarterly)
Fixing Transmitter "Chirp" (October 1997 ARCI QRP Quarterly)
MTP3055E Temperature Stabilization (July 1999 ARCI QRP Quarterly)
Latest info: More Mods for the QRP-PLUS (Winter 2003 & Fall 2005 ARCI QRP Quarterly)

Modified MFJ Cub

MFJ QRP-Cub Modifications (July and October 2000 QRP Quarterly)
Improved Tuning Linearity by W1HUE
Improved Sidetone Level, QSK, Keying Envelope by W1HUE
Reducing Warm-Up Drift (good general tutorial) by W1HUE
Simple RIT Mod by W1HUE
Alternate QSK Mod by Cub Designer Rick Littlefield, K1BQT

Modified OHR WM-1 QRP Wattmeter

Miscellaneous Modifications by Larry East, W1HUE
Peak Power Mod for the OHR WM-1/WM-2 QRP Wattmeter (January 1995 ARCI QRP Quarterly)
Cleaner Keying for the Ten-Tec 509 (June 1995 NorCal QRPp)
Improving SSB Performance of the Ten-Tec Argonaut 509 (October 1995 ARCI QRP Quarterly)
Curing VHF Interference in Ten-Tec Argonauts (July 1996 ARCI QRP Quarterly)
SAMLEX 305 Power Supply_Mods (October 1998 QRP Quarterly and 1999 QRP-L Posting)
- SAMLEX PSA-305 Schematic in HTML format - best for viewing
- SAMLEX PSA-305 Schematic in PDF format - best for printing (requires Adobe^® Reader)
Norcal 20 Modifications (April 2000 ARCI QRP Quarterly)
Improvements for the W9GR DSP Audio Filter (July 1994 ARCI QRP Quarterly)
HW-9 Tips (October 1988 QST - requires Adobe^® Reader to view)
Corrections to the above QST article

Links to Related Sites
More QRP-PLUS Mods & Tips
AD6A Norcal 20 Mods
LA3ZA's Unofficial Guide to Elecraft K2 Mods
K8ZT's Ten-Tec Resource Page
Assorted QRP Rig Mods
Mods for Rigs of All Types (must register to view mods)
KB2LJJ's Database of Mods and Manuals
QRP-PLUS User's Group Email List
QRP Amateur Radio Club International^SM
eham.net Radio Links

All mods found on this database are offered by other amateur. KB2LJJ takes no responsibility or liability for any damage resulting from .

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