AN/URT-3 Transmitter Restoration Project

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1/4/2009 UPDATE - It's alive! (without the booster until I figure out how to get 3-phase power to it). I still need to align the freq. synthesizer and work on the auto-tune, but I have 100 w out and modulation. Major thanks to John Dilks for providing extender cables! You should hear this beast when all 23 rotary solenoids start clacking madly and the auto-tune motors are whining away.

Kludge test set-up - Left to Right:   RF amp on desk, HV supply on floor, modulator in rack, oscillator on cart!

RF amplifier on the desk

HV supply (MVPS), 1300v & 500v, on the floor

LV supply and modulator in the rack

RF oscillator on the cart, with mike wires stuck into modulator connector.

3/19/2008 Acquired  - Early 1950's autotune HF transmitter - 100/500 watt, 136 tubes, dozens of relays
                                   300kc - 26 mc AM/CW/FSK
                                   More Info Here

Restoration Progress pages

Before delivery 100w transmitter rack	booster rack for 500w operation 4-125 modulators & 3kv HV p/s blowers in base	ACG - antenna tuner control unit	WANTED - I am looking for Antenna Tuning Unit, Extender Cables, Remote Control, & Test Units See Accessory Items Page
	xmtr rack upper note drain tubes from condensation drip tray at top	xmtr rack lower blowers in base	xmtr rack external connections in base
Nifty plug-in scheme for modules, but you really need the extender cables to work on anything.	upper xmtr rack module connections	PA to xmtr rack connections power, control, HV, & RF	PA module plug-in power, control, HV, & RF
RFA - PA - 4-400 socket at upper left	RFA - PA MF tank slug tuning	LLRM - 100w modulator control/monitor	MVPS - 100w HV p/s with 3B28's
RFO - freq synthesizer	above - manual freq control below - 10 preset freq	Uh-oh - serious mouse poop in the oscillator. This photo is after I'd cleaned it up some!	LVPS - control and LV p/s
LLRM - mouse nest	HLRM - 500w modulator with 4-125's and mouse nest	HVPS - 500w HV p/s missing 3B28's	HVPS - another mouse home

• Back to Navy Transmitter Page
• Back to AN/URT-2, -3, -4 Info page
• Please send me e-mail with suggestions, corrections, etc.