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World of Ham Radio 1997
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WOHR97_AmSoft_(1997-02-01).iso
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th78_4.doc
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1997-02-01
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TH78.4
On UHF all public safety frequencies up to about 500 MHz seem to
come in well but sensivity greatly drops from there (we really
can't ask for more). Frequencies can be programed in up to the
920MHz ham band but I have no way of measuring sensivity. 800MHz
works but the signals are very weak, you must be near the
transmitter for reception. Assuming you are in the town or city
where the transmissions originate it should work.
Transmit is enabled up to and incl. 500MHz but after testing this
on a frequency counter I find that a signal is only generated to
about 490 MHz, even though the trans. LED shows output in the
higher frequencies.
Crossband repeat seems to work fine but the audio is unacceptable
for use, BE AWARE the radio get's HOT! Prolonged use or use on a
busy frequency would not be recommended. Also remember this is a
dual band HT please use a proper antenna while in this mode to
avoid a high SWR, we should all know better... Right?
After first booting up the CPU in the mod I found that the message
screen showed "Cloning" so it seems that this radio now has cloning
capabilities. After searching I have found that holding the "0" key
and powering up the radio will display the clone feature, see below
for further explination.This leads me to believe that this HT may
have some more "Hidden" features that I am trying to find, some may
be useful.
Thanks to Gary KC8UD who sent me the following via packet .....
CLONING:
The TH-78 can be cloned without cloning cables or special equipment. It is done
entirely with RF, and, in fact, can be transmitted over the air, and even via
repeaters. This may be extremely useful for those users who do not have
the patience to program their own radios themselves. This application would
also be useful for clubs and user groups. (However, this can take as long as
50 minutes with the ME-1 expansion module. It is recommended that a dummy
load be used to prevent unwanted QRM.)
(1) Both radios must be on the same frequency.
(2) Activate both radios by pressing the "0" key while turning the power on.
The radios will display CLONE.
(3) Now, click the PTT of the "master" radio. The radio will transmit in the
conomy low power mode. This may take about 4 minutes for fifty channels.
hen the data has been transferred, both radios will revert back to the
riginal frequency.
(4) Turn both radios off and then on again. They will now operate normaly
while the slave radio has the same memory contents as the master radio.
** I have not tried the following modification myself, try at your own risk **
*** Rich N2CZF ***