SPRAT is a quarterly magazine, edited by George G3RJV. SPRAT contains many circuits, technical hints and ideas for QRP construction projects, together with club news, contest and award information and other items of interest to QRP operators. SPRAT is an exclusive QRP journal and contains much practical information in each issue.
If members are interested to find out which is the current issue and if the next issue is due soon then bookmark the news page for the latest updates.
Sprat 149 - 8-pole 10MHz SSB Ladder Crystal Filter
Sprat CD version 3 - Issue 120. We managed to miss out page 20 when compiling the CD. You can download it from here.
Sprat 146 - A Graphical Aid for Measuring Inductance and Capacitance Using the MFJ-259B - Mark C. Readman, G3YTZ. Here are the graphs which print full size to preserve your Sprat. (Capacitance & Inductance). These print just fine on my ink-jet printer but my cheap 600dpi laser printer struggles a bit. - Tony G4WIF
Sprat 132 - "RAMU" (Remote Aerial Matching Unit)
RAMU was conceived by Ian Keyser G3ROO as a system for matching aerials to their transmission lines at their feed points.
You can download the source code from here.
YU1RK SSB Exciter - Winter Sprat 2010 - parts list
Download the entire index (up to Sprat 149) in Excel format.
Here is a list of the currently available datasheets.
Please note that the list of datasheets shown in the current handbook is incorrect. Postal prices are the same as for SPRAT reprints but you can download them for free from here. These documents are in Adobe Acrobat Format.
A Guide to Capacitors by Paul NA5N. This is a fabulous document which will answer most of the questions you ever asked about capacitors. (1.6Mb)
A Short Guide to Harmonic Filters for QRP Transmitter Output by George G3RJV. (83kb)
The Resistive SWR Bridge - by Tony G4WIF & Ian G3ROO. (77kb)
Toko 10k Inductors for HF band use by George G3RJV. (37kb)
Quick and Easy Bandpass Filters for Receiver Input Tuning by George G3RJV._(36kb)
The "Direx" 40/20m DC Receiver by George G3RJV. (893kb)
The "SCD" complete Transceiver by George G3RJV. (71kb).
Installing the SPRAT CD by Tony G4WIF. This datasheet was created to assist with the installation of the CD from Funk Amateur containing all the issues of SPRAT from 1 to 100. (89kb).
Oscilloscopes by Paul NA5N (335k).
TAK893 Mixer by Paul NA5N (439k) - See SPRAT 108 page 24 for details.
S Units (54k) by Paul NA5N
A guide to Japanese / European Transistors by John G8SEQ
Club CW and SSB filters by Graham G3MFJ
Handymans Guide to Solar Acticity and HF Propagation
The Sprat Pixie File - collection of simple radios.
Making a Toroidal KANK - a replacement for those hard to get coils used in so many older Sprat projects.
Sprat CD version 1 - You have a new computer and no floppy drive in which to use the key disk. This document was kindly written by Ingo Meyer DK3RED.
GQRP Club toroid information by Graham G3MFJ
G8ATH / G0SIB crossed monopole antenna for HF / NVIS page 1 page 2
Toroid Inductance Chart - David Smith G4COE
10.006 MHz Crystal Filter - Jack Hardcastle G3JIR. Extra information for his article in teh Summer 2011 Sprat.
Note: Your P.C. may be set up to open the pdf reader within your browser, and on some versions, there isn't a "save" option. An alternative is to right click on the link and choose "save target" and this will allow you to download the file.
Version 1 - Produced by a German radio club Funk Amateur. It has the blessing of GQRP but is a totally independent initiative.
All enquires (or even complaints) must go to Funk Amateur. The CD contains Issues 1 - 100 of SPRAT and is suitable for use with Windows 95/98 and Windows NT. It can be viewed using Adobe Acrobat Reader (which you have to provide). It arrives with a key (floppy) disc based on your callsign (which you provide with your order).
Version 2 was also produced by Funk Amateur and covered issues 1 - 109 but did not require a key floppy.
Version 3 is the first "in house" produced CD. For further information please see our club sales pages.
Check here (and the Index) for corrected article errors.
Issue 95 (Summer 1998) Urs Hadorn HB9ABO wrote a very interesting article on a PIC based Electronic Keyer, unfortunately, the circuit diagram on page 4 was a little indistinct. It can be downloaded from here. (68k)
Issue 98 page 5. There was a section missing from the circuit diagram. Download it here (92k).
Issue 107 (Summer 2001) The Epiphyte circuit diagrams were a little indistinct. They can be downloaded in these two PDF documents. Diagram A & Diagram B. My thanks to Derry VE7QK for his permission to put these on the web and for supplying the documents.
Note: Your P.C. may be set up to open the pdf reader within your browser and on some versions, there isn't a "save" option. An alternative is to right click on the link and choose "save target" and this will allow you to download the file.
Issue 129 - "All Tubes" 80 CW QRP - HB9FAE. The circuit diagram didn't reproduce too well in Sprat so you can download it from here.
Issue 144 - "Eden IF and Digital AGC" by Ron Taylor G4GXO. There is an error in the Eden IF strip schematic. C10 in the microphone amplifier is shown as 100uF. At this value, you will have a long for the microphone amplifier biasing to arrive at its operating point, during which you will not be able to transmit. This capacitor (which is actually a decoupling capacitor) should be shown as 0.47uF. In practice any value from 0.1uF to possibly 1uF will work here. Here is the corrected schematic and you can download the Source and hex files from here.