[FoxHunt] ARDF Xmitter

[J. B.]

Jack,

I have no immediate plans for a fox TX.
I am playing with a MAX267B bandpass filter. I feed it with a cmos555 clock at
a 200X rate and get a 30 Hz bandwidth out of it, no phase shift with amplitude
variations. Get a free sample from Maxim and try, it its a wonder.

I will probably make an improved doppler with it and the Roanooke filter, also
I will use the new PIC18F252 that runs at 40 mHz, this one is made for C
compiler, it has more instructions and math build-in. I will re-use the round
LED display along with a LCD for the menus.

I purchased a Mini-Circuit double balanced mixer with a built-in Mar amplifier
to make a front end to a MC13135 FM receiver chip but Motorola does not make
them any more. This stuff is on the proto board doing nothing...

I am aving a hard time converting the local Hams from mobile hunts to ARDF,
that is why I was asking for a fox receiver or a kit or a plan to make one to
ease foot hunting. Also I would like to bring local Scouts in the fun, but
most, including me do not want to loan our expensive handies or receivers.

73 de Jacques VE2EMM

Jack Smith a �crit :
Jaques,
Do you have any plans to come up with another ARDF Xmitter that doesn't use
the now hard to get ICS chips?
Jack  KE4LWT