Ordering Crystals. Radio Shack 19-1204, BTX-123

7. Replace the two screws you removed from the battery guide 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:

Transmit Crystal:

Operating Frequency

8

Receive Crystal:

Operating Frequency — 10.7 (MHz)

4

For example, to transmit and receive 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 crystals 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

13