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Title: WW2 Navy TBW-4 Transmitter Project Post by: ka1tdq 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 Title: Re: WW2 Navy TBW-4 Transmitter Project Post by: W7TFO on November 26, 2021, 11:48:36 AM Great progress with the old girl, Jon.
Spin the dials and talk to me! :D 73DG Title: Re: WW2 Navy TBW-4 Transmitter Project Post by: ka1tdq on November 26, 2021, 03:19:29 PM I texted this to Dennis earlier, so I guess I’ll share here as well. I initially thought this was engineering overkill, but now I’ll chalk it up to artistic license. Check out that geared butterfly capacitor! AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
Jon |