Technical Pages

In these pages, we hope to include information that you will find useful. Some past articles from SPRAT may also feature here.

Howes Kits - Chris Rees G3TUX has generously provided the club with all the instruction leaflets that accompanied his range of Howes kits. Chris has now ceased trading but has granted the GQRP club permission to provide reprints to people who need them. Click here for further information.

Quick and Easy Bandpass Filters for Receiver Input Tuning - George Dobbs G3RJV

A Short Guide to Harmonic Filters for QRP Transmitter Output. - George Dobbs G3RJV

The "Octopus Tester. - Richard Brittingham - W4MCD

G3RJV Data Card. - RECOGNISING RESISTORS AND CAPACITORS

G3RJV Data Card - TOKO 10K INDUCTORS FOR HF BAND USE

G3RJV Data Card. - Mr. Ohm's Law.

G3RJV Data Card - PRACTICAL VFO VALUES (for the HF Bands based on Toko Inductors).

G3RJV Data Card - DIODES - LED and ZENER (WORKING OUT THOSE RESISTORS)

G3RJV Data Card - Some "Cookbook Values" for the popular Colpitts VFO

"S" Meter Calibration Data Card - by Gareth Edwards GM7WFT

PCB Island cutting tool

Reverse Polarity Protection.

Using a standard Radioshack (or Icom) microphone on the Epiphyte transceiver. - Derry Spittle VE7QK

Epiphyte Modifications from the pages of SPRAT.

The Resistive SWR Bridge

VFO Calculator by John Dryden G4DSN

GQRP Club CW and SSB Filters. (pdf files)