2-1
SECTION 2
OPERATING INSTRUCTIONS
2.1
OPERATING FEATURES
The equipment has several important operating features which provide maximum flexibility,
performance and versatility. These features are outlined below. New features provided in
TFM-138 units of s/n 1540 and up with F10-B software are indicated by an “*”.
1.
100 memory positions* which can each be programmed with a transmit and receive
frequency with 25 or 12.5 kHz channel spacing*, Tx/Rx CTCSS tones and a 9-
character alphanumeric title.
2.
2 guard channels which can each be programmed with a Rx frequency with 25 or 12.5
kHz channel spacing*, CTCSS Tx tone and a 9-character alphanumeric title.
3.
Scanning of preprogrammed memories with selective memory scanning*.
4.
Priority scan of memory channel 1, if desired.
5.
Direct frequency entry mode.
6.
Receive frequency simplex function.
7.
Switchable RF output power between 1 watt and 8-10 watts.
8.
Lockout of keyboard to prevent inadvertent entries.
9.
Variable frequency mode to manually scan up and down in 2.5 kHz steps.
10.
LED display variable dimming mode.
11.
Selectable 90 second Tx time out feature.
12.
Quick download* of any of the 100 memory positions to the guard memories.
13.
PC Memory download capability. (Does not upload memories from the transceiver).
2.2
OPERATING INSTRUCTIONS (See Figure 2-1)
1.
Switch power on by turning the main volume clockwise. The last programmed
frequencies will be displayed. The transceiver is now in normal operating mode.
2.
Adjust the audio level by adjusting the main and guard volume knobs.
3.
Pressing the squelch defeat button will open both receivers to confirm they work.
4.
The top display line will indicate which memory is selected followed by a "+" if the
memory position is in the scan list, an alphanumeric message, and the frequency of the
main receiver. A small "n" before the frequency indicates 12.5 kHz narrowband
channel spacing is in effect on this memory position. In the receive mode, the
frequency is followed by an "RT" if a RX CTCSS tone is programmed, or an "RX" if no
Receive tone is programmed. Similarly, in the transmit mode either a "TT" or "TX" is
shown after the frequency. The bottom line indicates guard receiver information.
Summary of Contents for TFM-138
Page 13: ...2 2 FIGURE 2 1 Operator s Switches and Controls TFM 138 F10 B software...
Page 24: ...3 2 FIGURE 3 1 Outline Drawing for Model TFM 138 Transceiver...
Page 26: ...3 4 Figure 3 2 Wiring Connections for TFM 138 Transceiver...
Page 30: ...3 8 FIGURE 3 4 Microphone and Sidetone Level Main and Guard Squelch Adjustment Access Holes...
Page 42: ...STEP SYSTEM PASS FAIL NOTES A 11...
