Note
The GP-11 replaced the VP-1-6 and VP-1-12 as Heath’s light-duty mobile power supply, and was promoted specifically for use with the Lunchbox transceivers. While the GP-11 still uses a vibrator, at least the vacuum tube of the VP series was replaced with silicon diodes.
Also, the choice of 6 or 12 volt operation on the GP-11 is made with a wiring option—no need for a completely separate product. In addition, the GP-11 delivers 67 percent more current than the VP series—100 ma instead of only 60, and uses a Mallory type 1610 (shunt-type) or equivalent vibrator running at about 115 Hz. (Note: This vibrator may be very difficult to find.) The shape of the output waveform is not specified, but will likely be found to be a crude approximation of a square wave. The output filter includes a 1.1 mH RF choke and a 0.01µF capacitor as hash filters. Finished in two-tone Heath green.
For a quick test, note that the unit should develop between 350 and 400 volts with no load attached. Caution: there are no bleeder resistors across the filter capacitors. Short the B+ and ground lugs to discharge capacitors.
WIRING OPTIONS
To determine the voltage for which the GP-11 has been wired, refer to photos for the location of vibrator socket F and terminal strip E. The voltage may easily be switched by changing the wiring as shown.
Power output (nominal): 250 VDC @ 100 mA, intermittent duty
Vibrator: Mallory type 1610 (shunt-type), or equivalent
Power requirements:
12.6 VDC nominal, 16 volts maximum @ 3 amps
6.3 VDC nominal, 8 volts maximum @ 6.5 amps
Photos, general information and specifications from "Heathkit: A Guide to the Amateur Radio Products," by Chuck Penson, WA7ZZE. Used with permission.
