"payam" wrote in message
om...
hi, where can i find practical high fre spectrum analyser circuit?
thanks

If by High Frequency you mean up to 30MHz, mine is quite practical and goes
up to about 140MHz
(http://www.hanssummers.com/electroni...ctrumanalyser/). If you
want UHF then try a google for "homebrew spectrum analyser", brings loads of
good links.

72 Hans G0UPL