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Monster Media 1993 #2
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PA570
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1990-09-05
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28 lines
PA570
Consumer Alert on P.C. Electronics
Supplier of ATV equipment
P.C. Electronics Item PA5-70 10 W amp
W6ORG, Tom O'Hara My invoice #11836
2522 Paxson Lane Date 7-27-90
Arcadia, CA 91007-8537 Cost $95.01
August 2, 1990
Last week I ordered a PA5-70, 10 watt ATV Power Module for
420-450 MHz. from PC Electronics. I received the power module
Saturday. I made the PC Electronics specified input attenuation
circuit to drop a 2 watt exciter below the 200 milliwatt maximum
rating. During the initial power up with the power control set to
minimum RF power out. I slowly increased power until a point that
I know to be 1.5 watts out of the exciter. During this RF power
increase I meticulously monitored the PA5 output power. However,
NO power gain was obtained. I got a maximum of about 600 milli-
watts from the PA5 into my Yaesu power meter running into a 100
watt dummy load.
Upon returning the defective PA5 I questioned the output
design of the PA5 as the coax is connected directly to the output
of the SAU-4 power brick. No matching trimmer capacitors are
included in the output design. Solid state devices are very
temperamental to the smallest of impedance mismatches.
CONTINUED IN FILE PA570.1