Ctcss | Radio Shack BTX-127 specs

19-1206.fm Page 13 Tuesday, August 3, 1999 10:50 AM

Setting Frequency Options

Before you can use your transceiver, an	About CTCSS
authorized service facility must set your	CTCSS	helps eliminate		interference
transceiver to a VHF business band fre-
	between	different users		of the same
quency you have a license to use. Then,
	frequency, letting you talk and listen to
you can select a preset CTCSS (Contin-
uous Tone Control Squelch System) fre-	people who are using other transceiv-
quency and set your transceiver to use	ers set to the same frequency and
it.	CTCSS code. This is like having a sub-
Here is what you need to do to set your	channel within a channel, giving you
	greater communication flexibility. When
transceiver to use a business band fre-	you set a CTCSS code — there are 38
quency and CTCSS.
	to choose from — and turn on your

þ Send your transceiver to an authorized	transceiver’s CTCSS, the transceiver
service facility to have it set to a busi-	transmits a tone with your transmis-
ness band frequency.	sion, letting you communicate with
À Set the DIP switches for a CTCSS fre-	anyone who has a transceiver set to
	the same frequency and code. This
quency (see “Using a CTCSS Frequen-
cy” on Page 14).	tone is too low for you to hear, but oth-
Ã Set your transceiver to that CTCSS	er transceivers can detect it.
frequency.
Õ Set a DIP switch to activate or deacti-	If CTCSS is turned on and set to the
vate CTCSS.
	same tone on the receiving transceiv-
You can select one CTCSS frequency at
	er, it only receives those transmissions
a time. If you do not want to use a CTC-
	that include the		tone. If	two	different
SS frequency, skip Steps 2_4 above.
	groups	oper-ate	transceivers		in the

same area on the same frequency, they do not hear each other’s broad- casts if they both use CTCSS and each select a different CTCSS tone. Your transceiver’s default CTCSS tone is 100 Hz.