TECHNISONIC INDUSTRIES LIMITED
www.til.ca
TFM-500 Installation & Operating Instructions
TiL 98RE243 Rev. N/C Issue 12
2-3
2.2
OPERATING INSTRUCTIONS (See Figure 2.1)
1. Switch power ON by turning the main volume clockwise. Depending how the radio is
configured, either the last programmed or last displayed frequencies will appear on the screen.
The transceiver is now in normal operating mode.
2. Adjust the audio level by adjusting the VHF, UHF, and GUARD volume knobs.
3. Pressing the squelch defeat button will open all receivers to confirm they work.
4. Read the display. The top line will indicate which VHF memory is selected followed by a "+" if
the memory position is included in a scan list, an alphanumeric message, and the frequency of
the VHF 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 or RX DPL code is programmed, or an "RX" if no Receive tone/code is
programmed. Similarly, in the transmit mode either a "TT" or "TX" is shown after the frequency.
The second line shows the same information for the UHF band. The third line indicates
information about the guard receiver.
5. Only TX CTCSS tones or TX DPL codes may be programmed for the guard receiver. At the
beginning of each line, an LED indicates open squelch.
6. Set the VHF/UHF/GD switch to the desired band.
7. Set the G1/G2 switch to the desired guard channel.
8. Set the HI/LO switch to the desired RF output power.
9. Select the desired memory by using the M.UP and M.DN buttons, or the RCL button and a
three digit number followed by ENTER.
10. To transmit DTMF tones, use the keyboard keys while holding the PTT button on the
microphone. There is a 5 second PTT delay after pressing a key so that you may press several
DTMF keys in sequence without having to hold the PTT. The keyboard returns to its normal
function when the PTT is released.
The display always shows the status of both receivers and the transmitter. The light at the left of
each line indicates which receiver is receiving. The display also indicates the memory channel in
use and the guard channel in use. A "TX" (no TX tone/codes programmed) or "TT"(either TX tone
or code programmed) on the right side of the display indicates which band is active when
transmitting. The transmit frequency is also shown. In the receive mode the display shows “RX”
beside the receive frequency if no RX tone or DPL code is programmed and “RT” if a CTCSS
tone or DPL code is programmed.
While in any programming mode, all receivers continue to function.
When the transceiver is in either of the operating frequency or CTCSS tone/DPL code
programming modes and you must respond to a call, click the microphone PTT once (the radio
will not transmit during this click). This will cause the transceiver to revert back to the normal
operating mode and communications with the caller can proceed in the usual fashion.
