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Re: [Amps] How to measure output power of a 800W vhf amp

To: amps@contesting.com
Subject: Re: [Amps] How to measure output power of a 800W vhf amp
From: Steve Thompson <g8gsq@eltac.co.uk>
Date: Sat, 03 Nov 2007 13:28:07 +0000
List-post: <mailto:amps@contesting.com>

Hamilton Horta - PY2NI wrote:
> OOOpssss  I guess 30 dB is too much attenuation for this (too low RF voltage
> to be rectified) , well maybe 20 dB would do the job?
No, 30dB is just fine - it will give you 0.5-0.8W output which is 5-6V rf.

I tried a simple detector at 144MHz with 51R resistor, 1N4148 and 10nF 
capacitor (very short leads on all of them). Feeding a 1Mohm DVM the 
readings were: 100mW 2.1V, 500mW 5.6V, 80mW 7.5V , 1W 8.45V

If you feed a meter with lower resistance, the readings will be slightly 
lower. To make useful readings, you have to know the real value of your 
attenuator.

STeve
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