Mt. St. Helena is an extinct volcano about 4300 FT AMSL just north of scenic Calistoga at the north end of Napa Valley. The station was located at the 4000 FT AMSL South-East Peak.
Mt. Hamilton is about 4200 FT AMSL, located on the east side of San Jose and is the home of Lick Observatory operated by the University of California. The station was located on Observatory Peak.
Equipment used at both ends are homebrew Gunn diode transmitters were the Gunn oscillator also serves as the receive local oscillator. The Gunn oscillator is wideband Frequency Modulated with direct voice frequency signals.
Transmitter
Gunn Diode Oscillator
Frequency: 10.250 GHz
Power: +15 dBm
Modulation: Wideband FM
Frequency Control: AFC to distant end.
Receiver
Single Diode Mixer
Frequency: 10.250 GHz ± 70 MHz
Noise Figure: 10 dB
IF: 70 MHz
IF Bandwidth: 1.0 MHz
Demodulator: Discriminator
Antenna
Parabolic Reflector
Size: 2 Ft Diameter spun Aluminum
Gain: 33 dBi
Frequency: 10.0 to 10.5 GHz
Feed: WR-75 Flared Horn - Button-hook
| Home
| Links |