Palstar AT5K Owner's manual - page 13
13
Operating Your AT5K cont’d
1-800-773- 7931 W W W .PALST AR.CO M
4. Any time a new or different antenna
is connected, it is necessary to repeat
the tuning procedure for the new
Troubleshooting
You hear a spitting sound while tuning
your AT5K at high power
You are probably tuning into an
impedance that is on the low side
(20W – 40W).
In this event, either reduce
transmitter/amplifier power to a lower
setting or change to a higher antenna
impedance by using a different antenna
or modifying the existing antenna.
Also, try to find the highest capacitance
setting (i.e. closer to 100 on the dial)
on the antenna knob. This will
probably require re-adjustment of the
inductance setting.
antenna. Be sure to write down the
new settings for future use with that
antenna.
As seen in the chart below an antenna
capacitance setting that is too low
under these conditions will result in
excessivly high voltages, high losses,
and poor efficiency.
1500 Watts into a 25
Ω
load
@3.5Mhz
8 W - 15 W
1000 watts (all bands)
15W - 25W
1500 watts (all bands)
25W - 50W
3500 watts (all bands)
50W - 2000W
160M — 3500 watts
80M - 15M—3500 watts
10M — 1500 watts (29.5 Mhz max)
Power Specifications
(assuming single tone key down)
Antenna Impedance
Max Power Rating
IF IN ANY DOUBT ABOUT YOUR ANTENNA
IMPEDANCE PLEASE USE A PALSTAR ZM30
ANTENNA ANALYZER BEFORE ATTEMPTING
HIGH POWER OPERATION.
Ant Cap Inductor
Voltage
Loss
100 pF
11.7 µH
4550
16%
200 pF
6 µH
2400
8%
300 pF
4 µH
1600
6%