wdhartman
Member
- Joined
- Jan 23, 2005
- Messages
- 2
Hi Guys!
I've got a 2 part project that I hope you can help me with.Avalanche S&R training includes use of a low frequency beacon. I usually have to bury a unit, than have a student find it. Lots of work for a large class. There are "beacon parks" available where pre-buried transmitters are remotely turned on and off, but they start at several thousand dollars. Presently, I'm using a Velleman R/C setup. The receiver turns on an attached beacon.
Problem is that the units are $50 apiece, and I would rather the beacon be in a student's possession. I don't have enough beacons or receivers to make a full blown park.
My training is primarily in digital logic circuits, not R.F.. Can someone come up with a transmitter circuit? An alternative R/C circuit would be great too!
Thanks!
Dave
The beacon stats are-transmit frequency: 457 +/- 0.1 kHz
transmit field strength: between 0.5 and 2.16 mA/m at 1 m
output
modulation: A1A (carrier on/off)
turn-on time: >70 ms
turn-off time: >200 ms
period: 0.9 +/- 0.4 s
I've got a 2 part project that I hope you can help me with.Avalanche S&R training includes use of a low frequency beacon. I usually have to bury a unit, than have a student find it. Lots of work for a large class. There are "beacon parks" available where pre-buried transmitters are remotely turned on and off, but they start at several thousand dollars. Presently, I'm using a Velleman R/C setup. The receiver turns on an attached beacon.
Problem is that the units are $50 apiece, and I would rather the beacon be in a student's possession. I don't have enough beacons or receivers to make a full blown park.
My training is primarily in digital logic circuits, not R.F.. Can someone come up with a transmitter circuit? An alternative R/C circuit would be great too!
Thanks!
Dave
The beacon stats are-transmit frequency: 457 +/- 0.1 kHz
transmit field strength: between 0.5 and 2.16 mA/m at 1 m
output
modulation: A1A (carrier on/off)
turn-on time: >70 ms
turn-off time: >200 ms
period: 0.9 +/- 0.4 s