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Thursday, May 19, 2011

3S4 QRP Midget


Last week I paid a visit to my friend Skip, K7YOO, in Winona. While rooting around in his parts storage I noticed a little transmitter. I've a weakness for QRP homebrew and this one, with miniature tubes, is of an era I don't have covered. A couple of days ago Skip dropped it off here in Rochester as he headed for the airport.

It is a version of the "QRP Midget" first described in July 1967 Popular Electronics by W5LET. Dave Ingram also covered it in November 1992 CQ. This one is build in a little bigger box with an added current meter and RF choke in the B+ line but otherwise it is a good copy of the original.

This transmitter uses tubes designed for battery powered portable radios common just before transistors took over the market. Two "power" pentodes in parallel run about a watt out on 80 or 40...not a barn burner but it should be good for some contacts.

Now I need to come up with a receiver along the same lines...

2 comments:

Сергей Николаеску said...

Hi Niel!

Continuing to read your blog.
Really like your designs.

You might fit the description in the journal "Radio № 3 1950"
(http://www.rw6ase1.narod.ru/0/god/1950/r50_03.djvu)

Yours!
Sergei ER1NS

Jack Jones said...

Hi,I would very much appreciate a permanent link on your blog-site to my QRP shortwave website.

Here’s a link to my QRP-website: www.stationqrp.com

Thank you very much in advance!

73's
Jack