View Full Version : qrp transmitters
06-24-2007, 08:44 PM
i am looking for either a kit or just a schematic of a QRP transmitter. i have already built a tuna tin 2 tx .all suggestions welcome.i am looking for something that gives anywhere between 1-10 watts or so.
06-24-2007, 09:53 PM
Have a look at GQRP on Yahoo, there will be plenty of members who will help you.
There are tons of options. Do you want multi-band or single band? Crystal control or VFO? Some places to look for info:
http://www.qrp.pops.net/ (schematics and descriptions of lots of circuits and projects -- good photos, too)
http://partsandkits.com/index.asp (supplies for building, RF building blocks)
http://www.intio.or.jp/jf10zl/ (it's in Japanese, but tons of cool schematics)
http://www.danssmallpartsandkits.net/ (Another source of parts, with some kits, too)
If you google qrp transmitter, I bet you'll find some good ones, too. Or if you can get old copies of QST or the ARRL handbook, there are lots of them. The "improved cubic incher" is a simple one for about 2 watts out.
06-25-2007, 01:50 AM
want to learn
realy learn to build
build a Universal QRP Transmitter MK II
designed by W7ZOI
its from Apr 2006 QST
with up grade mods in July 2006 QST
Kit comes from Kanga US
build it ugly style on blank pc boards
its a great next step
this is not a step by step
stuff parts in the board kit
you get the construction article from QST
and the parts
no heathkit or elecraft style instructions
you will learn more
building this parts kit
than building all the elecraft kits
go look it up on Kanga US web site
he sells some great advanced kits
06-25-2007, 02:24 AM
The original universal QRP transmitter came from chapter 2 in "Solid State Design for the Radio Amateur" a 1970's ARRL publication by DeMaw and Hayward.
It was/is a wonderfully simple solid state MOPA transmitter that, as Mac says, was updated in a recent QST article.
The original was a near foolproof class C design that could be adapted for any band. It was amazing in its simplicity and totally adaptive to ugly, manhattan or etched circuit board construction techniques.
There were some modifications on Haywards site for the updated universal QRP TX but for some reason he took them off the site.
AK7V posted a link to Dan's Small Parts. Dan likely has a kit (or had) a kit for the original universal QRP transmitter.
This site sells the parts for the current universal QRP TX and other kits:
Have fun with your homebrew projects,