# Presentation: 317611

## TDFM-136VHF/FM Digital Airborne Transceiver

_**Instructor**_
*MAJ David Mull*

- U.S. AIR FORCE
-  A U X I L I A R Y
- New Jersey Wing

## TDFM-136 Transceiver Overview

- Provides airborne communications capabilities with ground teams, mission base and customers.
- The transmitter has a minimum of 8 watts and does not exceed 10 watts output power
-  May be reduced by a front panel switch to 1 watt.
- Channel information is presented on a 48 character, two line LED matrix display.
- Data entry and function control via a 12 button keypad.

## TDFM-136 Transceiver Overview

- Digital or conventional analog FM communications
- Extended frequency range with selectable channel spacing
- Only for government agencies or contractors
- 200 operator accessible memory positions.
- Each stores up to nine (9) character alphanumeric identifier, and Operating Mode information.
- Each memory position also contains information for both transmit and receive including: frequency, CTCSS tone, DCS (DPL) code,

## TDFM-136 Transceiver Operator Controls

_**On-Off & Volume Control**_
- Power control for radio
- Adjusts volume for main channel

_**Guard Volume Control**_
- Guard channels not currently programmed.
- Recommend leaving turned down.

_**Momentary Squelch Release**_
- Cuts out squelch to allow radio volume to be checked.
- Press button to test.

## TDFM-136 Transceiver Operator Controls

_**MN/GD Switch**_
- Controls whether keypad controls the Main or Guard channel.
- Guard channels not currently in use.
_**Leave in MN position**_

_**Guard Channel Selector**_
- Not currently in use.

_**HI / LO Switch**_
- Controls output power from 10 watts to 1 watt.
_**Leave in HI position.**_

## TDFM-136 Transceiver Operator Controls

## TDFM-136 Transceiver Display Controls

- To increase display brightness, press the “up” arrow (2)
- To decrease display brightness, press the “down” arrow (8)
- Display will continue to adjust as long as the key is held.

## TDFM-136 Transceiver Channel Selection

- To increase channel number, press the “right” arrow (6)
- To decrease channel number, press the “left” arrow (4)
- Channels will increase until the last programmed channel is encountered and then will wrap to the first or vice versa.

## TDFM-136 Transceiver Direct Channel Selection

## Northeast Region Channels

- Channel 1 - Simplex (Standard for most of region)
- Channel 2 - Simplex (Standard for NJ Wing)
- Simplex channels are on repeater outputs.
- When working with ground teams that are using the repeater, wait for the repeater to drop before speaking (4 count).
- Channel 3 - Gnd / Gnd (Not normally used by aircraft)
- Channel 4 - Air / Gnd
- Channel 5 & 6 - National Repeater Inputs
**Do not ever use these channels from the air!**

## Northeast Region Channels

- Channel 7 - Hammonton Repeater
- Channel 8 - Netcong Repeater
- Channel 9 - Lakehurst Repeater
- Channel 10 - Franklin Lakes Repeater
- Channel 11 - Valley Forge Repeater
***Channels 12 - 94 are NE Region Repeaters***
- Channel 95 - SARC (SAR Council of NJ)
- Channel 96 - SPIN4 (NJ State Police Emergency)

## Northeast Region Channels

- Channel 97 - 99 NOAA Weather 1 to 3
- Channel 100 - Marine 6
- Channel 101 - Marine 16 (Maritime Emergency)
- Channel 102 - Marine 21A (Tow Frequency)
- Channel 103 - Marine 22A (CG Talk Frequency)
- Channel 104 - Marine 23A (CG Emergency)
- Channel 105 - Marine 81A (CG Emergency)
- Channel 106 - Marine 82A
- Channel 107 - Marine 83A

## Tips for Effective Communications

- For Simplex Operations
- Climb for improved performance
- Better line of sight for communications
-  For Repeater Operations
- Descend for improved performance
- At 2000 feet or below airborne operations will not interfere with other repeaters.
- For all Communications
- Use proper radio procedures and prowords

## Questions?