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WW2 Navy TBW-4 Transmitter Project




 
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November 30, 2021, 04:59:50 AM *
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Author Topic: WW2 Navy TBW-4 Transmitter Project  (Read 241 times)
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ka1tdq
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« on: November 25, 2021, 09:09:13 PM »

Dennis, W7TFO gave me a completely original Navy TBW-4 transmitter with the condition that I build a power supply for it and put it on the air. I needed to build a pedestal for the transmitter to sit on and a cabinet for the power supply, modulator and controls. The pictures show what I came up with.

They originally used suppressor grid modulation but I'm going to go with plate modulation via a modified Heising configuration and solid state car amp. It'll also sport a high/low power output switch for varying the B+ on the final. I'll have a spot switch as well and an AM/CW mode switch. Not really necessary but it'll also have a soft start circuit with permissives.

The receiver, as usual, will be an SDR play.

Jon


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W7TFO
WTF-OVER in 7 land Dennis
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« Reply #1 on: November 26, 2021, 11:48:36 AM »

Great progress with the old girl, Jon.

Spin the dials and talk to me! Cheesy

73DG
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Just pacing the Farady cage...
ka1tdq
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« Reply #2 on: November 26, 2021, 03:19:29 PM »

I texted this to Dennis earlier, so I guess Iíll share here as well. I initially thought this was engineering overkill, but now Iíll chalk it up to artistic license. Check out that geared butterfly capacitor!

Jon


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