is simplex operation on the OUTPUT frequency of a repeater pair -
sometimes called "LOCAL" or "DIRECT". The
Syntech 1 series radios are capable of Talk-around operation when
appropriately programmed and activated by a front panel
switch. Reference is made to this function in the Midland 70-1000
programmer manual, in relation to the Z-273TA module.
The good news
is that this does NOT actually require a different EPROM module - the
standard Z-273 is fully capable of containing the information
required for the microprocessor to implement this function. Now
your channel list no longer needs to be filled with
the simplex-on-output version of all your repeater channels, and that
faster selection of Talk-around and valuable
extra channel space.
The bad news
is that you need to arrange a suitable switch to select Talk-around
operation. While the latent functionality is there in the Syntech
1, no front panel space was allowed after MON/PRI/SCAN
for a fourth switch. You can invent your own workaround, but with
the two scan buttons one can
readily be diverted to this role. Details are available on
Commencing with version 1.14 of
the Z-273 programming software, the required TA information will
always be automatically placed into
the Z-273 module. This
will have no effect where a TA switch has not been connected.
See the software
release page for details of our software distribution
|For the Syntech 80-channel
portables (70-155/255) the story is similar. These also
latent capability within the standard set. We even have a number
70-255B sets with Talkaround enabled as received from the supplier,
with the corresponding factory labelling! As
these units at hand provided the basis of our Z-350 analysis, we
the TA feature into the Z-350 programming from the outset (beta version
As our only service manual copy does not contain schematics, it will take a bit of digging on our part to ascertain where the SCAN line was diverted to the microprocessor's TA input.
1. The Talkaround function is identical on the early 36-channel version of the ST-1, and is probably more important there due to their lower channel capacity.
to differences in the microprocessor mask programming, the A.W.A. RT-85
can NOT support this direct talkaround.
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