Radio Shack Mastering Subaudible Tones with HTX-242 Radio for Enhanced Communication

Using Subaudible Tones

Some repeaters require you to transmit a subaudible tone to acti- vate them. You can set your HTX-242 to transmit any of the 38 standard subaudible tones. You can also limit incoming reception by setting the HTX-242 to open the squelch only when someone transmits a subaudible tone you select.

Valid Subaudible Tones

Code	Freq. (Hz)	Code	Freq. (Hz)	Code	Freq. (Hz)
XZ	67.0	1B	107.2	6Z	167.9
XA	71.9	2E	110.9	6A	173.8
WA	74.4	2A	114.8	6B	179.9
XB	77.0	2B	118.8	7Z	186.2
WB	79.7	3Z	123.0	7A	192.8
YZ	82.5	3A	127.3	M1	203.5
YA	85.4	3B	131.8	M2	210.7
YB	88.5	4Z	136.5	M3	218.1
ZZ	91.5	4A	141.3	M4	225.7
ZA	94.8	4B	146.2	M5	233.6
ZB	97.4	5Z	151.4	M6	241.8
1Z	100.0	5A	156.7	M7	250.3
1A	103.5	5B	162.2

Setting the Subaudible Tones

Some repeaters require you to transmit a subaudible tone with your transmission. You can also set a tone that must accompany transmissions for your HTX-242 to open squelch.

Follow these steps to set the subaudible tones for the VFO mode. After you set the tones, you must activate the function to turn it on. Changing this setting does not change the tones stored in any memory channel.

1.Press VFO.

2.Hold F for at least 1 second. FUNC flashes.

3.Press T-SQL. The HTX-242 displays rC and the currently set receive tone.

4.Rotate TUNE, or press UP or DOWN on the microphone, to set a different receive tone. If you do not want a receive tone, select oFF.

36