Specifications

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1. SPECIFICATIONS
Function……………….The 70cm Discovery is a desk top linear RF amplifier with a
nominal output of 800W covering the range 430-440MHz for
amateur radio use.
Type of emission…………………………………………………SSB/FM/CW/RTTY
Dimensions………………………………….……14in wide x 9.75in high x 17in deep
360mm x 250mm x 430mm
Weight……………………………………………………………………………..25kg
Output power…………………………………...…………………….800W CW/SSB
Gain……………………………………………...………………………11dB nominal
Power requirements………………………………..………230V AC at 15A, 50/60Hz
Duty cycle………………………………………Full O/P with normal amateur service
Cooling………………………………..……………………….……Forced air cooling
Frequency coverage………………………..……………………………430-440 MHz
Input impedance……………………………..…………50 Ohms with tuned I/P circuit
Valve……………………………………….………………………single GS 31 triode
Harmonics………………………………….…………3
rd
harmonic: better than –45dB
Plate voltage……………………………………..……………………SSB: 2800V DC
Cabinet……………………….……………chassis – Zintec steel, covers – aluminium
RF compartment – aluchromed aluminium
Antenna relay…………24VDC antenna relays automatically transfer the driver
to the antenna when in STBY or OFF. Standard in-built are
coaxial O/P relay and short throw I/P relay.
The amplifier requires a relay contact in the driver to key the
amplifier.
Metering………………………… ……………Plate current, Grid current and RF O/P
Protection…………………………… AC fuses, Grid over-current, Plate over current,
Internal valve flash-over, over-drive, soft start,
Warm-up timer