Transmitter Hunting, or Foxhunting, is a popular way to combine outdoor activity with the amateur radio hobby. The "Fox" hides a hidden transmitter, and the hunters use direction finding techniques to locate it.
The MicroFox line of hidden transmitters are small, self contained 2-meter transmitters designed for walking and driving foxhunts. They include a frequency agile 2-meter transmitter and a controller to generate all the user-defined tones and timings. A simple way to put on a hidden transmitter hunt.
These controllers can be connected to any handheld or mobile ham radio to create a hidden transmitter for walking and driving foxhunts.
AA1 Active Attenuator
The AA1 is an active / offset attenuator that can be used to help find a hidden transmitter in the last few hundred feet when a radio's s-meter is maxed out. It conects to an HT's SMA connector and an antenna, and by tuning to an image frequency, the signal strength can be adjusted to bring it to a useable level. This design is based on the K0OV attenuator
AA1 User Manual
With SMA male and female connectors. Includes a CR2032 coin cell.
SMA F-F adapter
Used to adapt the AA1 to a radio with a male SMA connector such as a Baofeng.
These 2W inline fixed attenuators can be used on a receiver to reduce the signal strength of a nearby foxhunt transmitter. They have a male and female SMA connection so they can be easily inserted in place in any SMA connection.
One of each of the above. Combine for 50dB total attenuation.
Other Foxhunting Items
This is a TDOA (Time Difference Of Arrival) antenna switcher that, when combined with a radio receiver, will tell the direction to a transmitter. It generates an audible tone on an 2-meter FM receiver when the two antennas are not the same distance from the transmitter, and thus receiving the signal out of phase from each other. That tone will fade away when the two antennas are rotated as they become equidistant from the transimtter, and fall into phase.
Full Byonics Product Line