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Author Topic: 40 meter CW transmitter  (Read 2874 times)
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ka1tdq
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« on: November 23, 2019, 07:38:13 AM »
I bought a round block of aluminum and built a 40 meter CW transmitter out of it. Power output is 9 watts with a 13.8vdc power supply.  It'll look nice on the desk paired next to my 20 meter QRP transmitter.

Jon

* IMG_1862.jpg (2078.1 KB, 4032x3024 - viewed 480 times.)
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W1NB
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« Reply #1 on: November 23, 2019, 06:57:50 PM »
Nice job!
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ka1tdq
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« Reply #2 on: November 24, 2019, 10:23:41 AM »
I was having a QSO with the 20 meter version, and he complimented me on the quality of the rig's sound. He said that homebrew rigs usually have chirps and the tone isn't steady.

I'm using an IXDD driving a FET and there may be key clicks there, but at such a low power level I'm not too concerned. I'm just keying the oscillator power going to the IXDD.  The FET and driver have power all the time. The 20m FET is an IRF-510 and an FQA11N90 for 40 meters.

Jon
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Opcom
Patrick J. / KD5OEI
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« Reply #3 on: November 24, 2019, 01:45:41 PM »
QST cover art!
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ka1tdq
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« Reply #4 on: November 27, 2019, 11:40:35 PM »
Thanks! I like to think of it as art.

I just made my first QSO with it. Nothing earth shattering for distance, but respectable. NQ6B, Tom near San Diego.

Jon
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KA0HCP
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« Reply #5 on: November 30, 2019, 12:32:29 PM »
Clever use of the jointing dowels to hold the toroids!
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New callsign KA0HCP, ex-KB4QAA.  Relocated to Kansas in April 2019.
KB2WIG
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« Reply #6 on: November 30, 2019, 02:32:12 PM »


I like how the flux was cleaned off.


klc
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