QRO Technologies HF-3KDX, Инструкция по эксплуатации

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LOADING AMPLIFIER HEAVY: One technique for operating an amplifier at various output power
levels is to load it “heavy”. This procedure requires you to tune the amplifier for the maximum
output power you desire. Then, simply reduce your input drive power to the desired output power
level. If you wish to change your output power, simply increase or decrease your input drive
power to the new level of output power desired.
To facilitate your initial tune up, we have included a tune up chart. These settings and readings
are into a 50 ohm dummy load. Your actual reading may vary do to any reactance in your
antenna. Record your settings for future reference. You can control the power level of your voice
peaks on SSB by advancing the ALC Control clockwise assuming you have the ALC line
connected between your transceiver and amplifier.
TUNE-UP TABLE
Frequency
(MHZ)
Power
Input
Tune Load Grid
Current
(PC) Plate
Current
Power
Output
1.80
1.90
3.60
3.90
7.20
14.20
21.30
28.50
WARC BAND OPERATION:
The HF-3KDX has not been designed to operate on the WARC
Bands. This occurs because there are not enough bandswitch positions to accommodate these
bands. You can get some amplification on 17 & 12 meters. You will have to use
your transceiver’s
internal antenna tuner .This will get you a proper input match to the amplifier. Also, you will have
to set the bandswitch to 15 meters for 17 meter operation or set the bandswitch to 10 meters for
12 meter operation. However, you will not get amplification on 30 meters.
A Word About Wattmeters: The most reliable and accurate Wattmeters are either the Bird or
Coaxial Dynamics thru feed. Wattmeters which use a ferrite core for r.f. sampling can be
unreliable at high power levels. If you are using such a wattmeter and you observe an output level
less than 1,500 watts for the values listed above, your wattmeter is probably not giving you an
accurate reading.
Input SWR: The input SWR has been set for at least 1.5:1 on each band. You can make slight
adjustments using the tuned input access holes to adjust the mica trimmer capacitors for each
band.