Operating with Power amplifier
- Preferably start with 14 MHz or 7 MHz. To recall the appropriate tuning values from the
memory place the Tune/Memory switch in Memory position and select the appropriate
frequency cell. Check the adjustment for lowest reflected power.
- Switch on the power amplifier and set the Output power to approximately 200 Watts. If
you are using a tuneable (Plate and Load) PA, tune it for max. Output power by reading
Forward Power on the SWR meter.
Increase the power step by step while you readjust the PA accordingly.
-
Keep the On time to less than 30 Seconds during full power tuning
- For small corrections to bring the SWR to 1:1 use the ANT control knob only.
-
Never change L under full power condition!
When there is a sudden increase of the
backward power while the amplifier power
is increased, most probably an arcing
happened in the RF Unit.
Immediately switch of the transmitter.
The antenna is too short for this band
(frequency) or it is resonant.
Example Values for a Matched Antenna
Dipole 2 x 40ft. (2 x 13,5 meters), average height over ground 21ft. (7 meters) with 27ft. (9
meters) Wireman feeder line (here the shown antenna is too short in relation to the feeder
length, see 1.8 MHz band)
Band
MHz
TRX L ANT
Remarks
28 007 000 016
24 014 000 021
21 004 000 051
18 012 002 013
14 003 003 016
10 036 003 083
7 059 002 116
3,5 100 003 118
1,8
255
029
019
antenna too short, max. output power
400 Watts
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