[FoxHunt] Attenuator

[Uwe DF7BL]

Hi Bob, ist there a way to get the schematic of that sniffer. May be direkt.
Sorry for the list but mailman does not accept attachments.
73 de uwe df7bl

Bob schrieb:
> 
> My friend Tony has built a sniffer around the Analog Devices
> Logrithmic amplifier chip. Here is his report...
> 
>    "This week I finished my new sniffer with the AD 8307. It
> is
> the best I have ever used. I combined the 8307 and a ticker
> that goes up
> in tone with more RF. It starts to tick at -107 dbw and has
> 70 db dynamic range to the high tone. I then can switch in
> 30 and 35 db
> attenuators to numb it  60 db. The lost 5 db is some kind of
> leakage. (marginal shielding)   I think I did the
> measurements correctly.    I can stand in my yard and key a
> repeater 10 miles away and it
> will start to tick when pointed in that direction. With the
> switches in, -60db, I can DF my repeater, 80 watts at 25
> feet."
> 
> I suggested to Tony that he replace the toggle switches with
> relays and use bypass feedthroughs for the wires to get
> better shielding. He is working on numbing down the 8307 as
> well. It is one hot chip It takes almost no support parts
> and has a 90 dB dynamic range if you can figure out how to
> get them all.
> 
> cut cut....