Radio Shack BTX-123 User Manual
13
7. Replace the two screws you
removed from the battery guide
plate, then tighten all the
screws.
plate, then tighten all the
screws.
8. Replace the battery pack and
the antenna.
Ordering Crystals
To determine the crystals you need,
use the following formulas:
use the following formulas:
Transmit Crystal:
Operating Frequency
8
Receive Crystal:
Operating Frequency — 10.7 (MHz)
4
For example, to transmit and re-
ceive on 151.455 MHz, specify a
transmit crystal of 18.931875
(151.455 MHz/8) and a receive
crystal of 35.18875 MHz ( (151.455
– 10.7 MHz)/4).
ceive on 151.455 MHz, specify a
transmit crystal of 18.931875
(151.455 MHz/8) and a receive
crystal of 35.18875 MHz ( (151.455
– 10.7 MHz)/4).
We recommend you only order crys-
tals for this transceiver through your
local RadioShack store. If you do
purchase them from another source,
the following information might be
helpful:
tals for this transceiver through your
local RadioShack store. If you do
purchase them from another source,
the following information might be
helpful:
• Case Type: HC-50/T
• Load Capacitance: 20 pF