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Old July 23rd 07, 08:02 PM posted to rec.radio.amateur.antenna
Jerry Martes Jerry Martes is offline
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First recorded activity by RadioBanter: Jul 2006
Posts: 173
Default Malfunctioning homebrew field strength meter


"You" wrote in message
...
In article ,
"amdx" wrote:

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



Hmmmm, I am not suprised at you 0V out near the Wireless Router,
when compared with a Microwave Oven, the difference in Power
Output IS significant. (100Mw Spread Spectrum, 100+ Watts
CW)


Hi You

It seems reasonable to assume the oven door was closed when the voltmeter
readings were made.
But, If-*IF* the meter readings were accurate *and* he was able to read
even 1 mv at the Router and 80mv at the oven, there is alot-*alot* of error
introduced into this test from somewhere. The math and power level
estimates are left for the readers to deal with.

Jerry