"amdx" wrote in message
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"Owen Duffy" wrote in message
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"amdx" wrote in news:4f6f2$46a49e2b$18d6b40c$11917
@KNOLOGY.NET:

I built the circuit from the page below.

http://www.atvinderby.co.uk/2.4Ghz_SWR_Meter.htm

The I get 0v out when held near my wireless router, if
I put it near the microwave oven, the high input impedance
meter bounces up and down between 7mv and 80mv and
everything in between.
I used a 1N416E diode and a 1500pf filter capacitor. The
tuning cap doesn't have any affect.
Should this circuit work? If so what could I be doing wrong?

Mike



Mike,

In this part of the world, WLAN equipment at 2400MHz is restricted to
10dBm EIRP. (A microwave oven delivers almost 60dBm to its load, leakage
is hopefully much less.)

If you were to place your quad at 1m (meaning 1 metre) from the router,
and lets assume your router had 0dBi gain, that your quad is actually
optimised (including impedance matched to the load) and delivering 7dBi
gain, you would expect to develop around -23dBm in a 50 ohm load. That is
a pretty small voltage, and you would expect to get around 1mV DC from a
microwave detector if the source was a continuous source... but is it?

Owen
I don't know but, I'll go fire up the laptop and see if I get more signal
while
I'm loading my homepage.
Mike much more than
Ok, I have the field strength meter about 1ft from the router and it reads
about 3mv,
while loading the homepage it jumped to 15mv and loading a pdf file caused
it to go to
25mv. However I get 0v if I move much more than a foot away.