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19-1125.fm Page 13 Tuesday, August 3, 1999 9:47 AM
UNDERSTANDING THE HTX-212
This section explains some of the HTX-212's features. See "Basic Opera-
tion" which starts on Page 17 for instructions about how to use these fea-
tures.
DUAL VFO MODES
The VFO (Variable-Frequency Oscillator) modes let you directly select a
frequency anywhere within the HTX-212's operating range. Your HTX-212
has two VFOs: VFO-A and VFO-B. You typically use the VFOs to tune to
frequencies you have not stored into one of the HTX-212's memory chan-
nels (see "Memory Channels" on Page 14).
A related feature of the HTX-212 lets you transmit on the frequency
selected with one VFO and receive on the frequency selected with the
other VFO. (See "Using the Dual VFOs for Duplex Operation" on Page
27.)
DTMF (TOUCH-TONE) FEATURES
DTMF (Dual-Tone, Multiple Frequency) is another term for touch-tones
(the tones a telephone produces when you press a digit). This standard
set of tones is used by many different amateur radio systems for access-
ing programmable features and dialing through autopatches.
Your HTX-212 produces all 16 standard DTMF tones (0-9, Q, #, A, B, C,
and D). It has six DTMF memories which can each hold up to 15 digits for
quick transmission. You can also set the HTX-212 to listen for a specific
set of DTMF tones, and alert you when it detects them (this feature is
called DTMF Paging). Until it hears the sequence, the HTX-212 does not
pass any transmissions to the speaker.
Group Calling lets you DTMF page a single person or an entire group of
people. To use group calling, every person in the group selects the same
first three digits as their DTMF page sequence. They then select up to four
additional digits unique to each person. To page an individual, you trans-
mit their entire DTMF page sequence. To page the entire group, you trans-
mit at least the first three digits of the sequence, followed by the DTMF
tones for A, B, and C.
Note: Group Calling only works with the HTX-212 and other transceivers
that support this feature.
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