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World of Ham Radio 1997
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WOHR97_AmSoft_(1997-02-01).iso
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r7000_03.doc
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1997-02-01
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R7000.3
Using the internal, top-mounted speaker, the R7000 has
good audio power and fidelity, better than my R71A.
The user manual is generally good, and a schematic is
furnished. Some broken English makes it unclear as to
whether the R7000 battery backed up RAM contains
firmware as in the R71A.
There are provisions for activating a tape recorder
when a signal is received, but there is about a 1
second delay in activation, causing the recorder to
miss the start of the transmission. I may replace the
capacitor in that relay circuit when I get the nerve to
open the cabinet for the first time.
Another relay is used to switch in some filters for
reception above 512 MHz, so one hears the relay click-
ing while scanning a mixture of low and high frequen-
cies, a bit unnerving.
There's a lot of fun to be had with the R7000. It was
interesting tuning through the link and paging signals
in the 72-76 MHz band, and listening to military air-
craft in the 200-400 MHz band.
My UHF antenna system consists of a government surplus
FAA discone, good for coverage between 150-1200 MHz.
Although not as good as a Butternut SC3000 antenna in
the 150-174 and 440-512 MHz ranges, the discone has the
edge in the 225-400 and 512-1200 MHz bands. At these
frequencies, a low loss feedline is very important, and
I use a Belden 9913 clone made by International Wire
and Cable.