In article , Serge Auckland
writes


"Keith G" wrote in message
...

"tony sayer" wrote in message
...

http://www.shakti-innovations.com/audiovideo.htm
--


Never mind that nonsense, Tony - I'm still waiting to hear if an FM signal
strength of '55 dBf' as per:

http://www.apah69.dsl.pipex.com/show/Signal.JPG


Is reckoned to be 'good' (or 'good enough')...???

(Certainly sounds OK!!)
Keith:-

If I haven't pressed any wrong tits on my calculator,

55dBf means 55dB above 1 femtowatt, or 10^12 watts
55dB is a power ratio of 3.16 x 10^5
so 55dBf is a power level of 0.316 microwatts.

Assuming a standard 75 ohm antenna, that translates to 4.87 mV, so I'd say
that was a pretty good signal.

S.

That tuner uses a common place audio demod chip just to drive the sig
and deviation meters!. They use a totally separate pulse count
discriminator for the audio .. and excellent it is too)
--
Tony Sayer