The GRC-19 Radio Set was designed by Collins in the early 50's, but most of
them were built by other manufactures, the pair (the T-195 transmitter and the
R-392 receiver) that I have were built by Stewant Warner.
Their primary input voltage is 24-28VDC at about 45 Amps. They were designed to live on the back of a jeep in the elements, because of this they're weather proofed. When you put the transmitter in operation you have to open 3 vents, as the transmitter is forced air-cooled. In use, the transmitter sounds like a military jet waiting take off. An Amusing antidote happened to my transmitter concerning these air vents. I had the rig setup in an outside building for awhile and I was leaving these vents open. A mouse thought that one of them was a good storage place for a later meal! When I turned on the transmitter much to my amazement it started blowing seeds out of this vent! Luckily none of the seeds got inside of the transmitter. For the rest of the time that the rig was in that out building, I kept the vents closed when the transmitter was off! The transmitter covers from 1.5Mc to 24.4mc,on either CW or AM and also was setup to use an external frequency shift keyer for RTTY operation. It uses high-level plate modulation on AM and semi-break-in for CW. The power output is in 100 to 125 watt area depending on the input voltage. The transmitter will tune itself to the antenna, all that you do is set the band and the frequency and the transmitter does the rest, matching either a 15 foot whip or resonant antenna.
The receiver is a superheterodyne using triple conversion on the eight lower bands and double conversion on all the other bands. The frequency range is .5 to 32 mc in 1-mc bands using a mechanical digital readout. It receives AM and CW, and SSB using the BFO for product detection of the signal. It has 3 positions of selectivity 2, 4, and 8kc. It also is unique in the fact that it uses 24VDC on both the plate and filaments. It likes higher voltage (28 to 30VDC) on the plates for better gain. It only has 200 milliwatts of audio output, so you must use headphones with this receiver (especially with the transmitter running). This is a very nice receiver to use, not quite as stable as either the R-390 or R-390A, but very good even still. It tunes SSB very easily and sounds great on AM!
For more information on the T-195 and the R-392 Electric Radio has articles in Dec 1990 on the R-392 receiver and Dec 1999 on the T-195 transmitter.
I also have a photo of my 1998 Vintage field day station setup in the back of my Ford 4x4 Truck. I think that only thing that I didn't bring was the kitchen sink! This photo shows both the GRC-19 and the GRC-9 sets and the DY-88 supply for the GRC-9 and the DC supply for both radios. Enjoy Mike