Fox Hunting Transmitters

The Adept T400P-6 Programmable Transmitter, pictured at the right, is probably our most popular fox hunting transmitter. Its power output is 8 milliwatts, and it can be heard for up to a mile on the ground. The output frequency is 433.92 MHz. The T400P-6 is always welcome at events such as Field Day, and other events when hams and their families get together, such as the annual picnic. It is generally programmed to run in AM mode, and to identify itself with the local club's call sign. The receiving antennas on 433.92 MHz. are quite small, and are easy to handle by adults and children alike. This transmitter is also becoming quite popular art some of the larger and more organized fox hunts. This transmitter is quite rugged, and should last for many years. It can also be used as a tracking and location transmitter.

Many boy scouts have been introduced to Radio Direction Finding as they tracked the T400P-6 at their annual Jamboree On The Air, JOTA. This event is sponsored each year by various Amateur Radio clubs. This transmitter is easy to conceal in trees next to limbs, under leaves on the ground, and some hams like to bury them under sand for a real entertaining hunt. Many hams already have the necessary receiver for this device - most dual and triple band HTs include a wide band receiver with the ability to receive AM at 433.92 MHz. The quarter wave antenna plugs into a small socket on the top of the transmitter module. The module snaps onto a standard nine volt size battery. For a shorter hunt, up to a hundred yards or so, the antenna can be removed to lower the effective power output to a very low level.

T400P-6 Programmable Transmitter

Price: $55

T400P Transmitter, Instructions

Information on Programming

 

Specifications, T400P-6 Programmable Transmitter
  • Dimensions: 1.05" diameter by 0.7" thick (including connectors). Antenna measures 6.35" above module.
  • Weight: 14 grams, excluding battery.
  • Power Output: 8 milliwatts, RMS. Use shorter antenna to reduce power. Remove antenna for very low power.
  • Antenna: 1/16" by 6.5" brass. Soft Plastic Tip for safety.
  • Programmable: AM mode or CW mode, plus call sign (or other string of characters) up to about 15 letters depending on their lengths.
  • Modulation: sends 50 ms carrier pulse in CW mode, and 50 ms modulated (1 kHz) pulse in AM. Pulses (beeps) are every 1.3 seconds. Identifies in Morse Code every 85 seconds.

 

T400P-BNC Programmable Transmitter

Price: $69

Specifications

  • Dimensions of Block: 0.47 by 0.6 by 1.08 inches. 
  • Weight: 18 grams, as shown.
  • Antenna supplied by user.
  • Power and functional specifications same as for the T400P-6.

 

T400P-SMA Programmable Transmitter

Price: $67

Specifications

  • Dimensions of Block: 0.47 by 0.6 by 1.08 inches. 
  • Weight: 10 grams, as shown.
  • Antenna supplied by user.
  • Power and functional specifications same as for the T400P-6 and T400P-BNC.

 

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10-2-13