7
MECHANICAL DRAWING
(WHEN USING THE POWER SUPPLY WITH RADIO TRANSCEIVERS)
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This power supply generates, uses and can radiate RF energy as per limits laid down under class
“B”, Part 15 of FCC rules. Position the radio, antenna and power supply to minimize any received
spurious noise from the power supply and excess RF energy from the transmitter. Ideally, for a
100 watt HF installation, the antenna should be at least 40 to 50 feet from the power supply to
eliminate the effects of transmitter energy on the power supply and induced noise from the power
supply to the receiver.
•
If the supply fails to turn on, check that the transceiver is off. The supply may turn on with a
lower load (transceiver in the receive mode) but may not turn on if the transceiver is in the trans-
mit mode (high current consumption).
•
The antenna being too close to the equipment may cause a slowly oscillating buzzing carrier
heard in the receiver. A loose coaxial connector or a broken or missing ground may aggravate
this problem. Normally, these noises will be below the background or “band” noise. RF feedback
from the transmitter may create instability in the power supply causing a poor sounding, raspy
or unstable transmitted signal. A distance of 40 to 50 feet between the antenna and equipment is
generally recommended for any 100 watt HF installation. Position the antenna as far and as high
from the equipment as possible.
•
The power supply may turn off due to excessive transmitter energy being coupled into the AC
and the DC lines. Either your antenna is too close (less than 10 feet) or the antenna system is not
radiating properly. First check the antenna system SWR. Then, if necessary, relocate either the
antenna or the equipment further apart.