Measure V p-p into an accurate 50 ohm dummy load with a decent o-scope. Power
is then V^2/400.
At 01:45 PM 7/3/2005, J. Coote wrote...
Comments on the accuracy of using the Tek 492 method, and on other accurate
wattmeter options?
___
Elecraft mailing
The Elecraft Mini-Module DL1 Dummy Load has test points that allow you to
use a DMM to measure out put. I can't imagine anything in that price range
being more accurate
73, KI4DGH
Chuck Gehring
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of J. Coote
Sent:
Jay,
I may have answered this already on QRP-L, but I find the most accurate way
to determine power output is to use a good 50 ohm resistive load (check it
with an antenna analyzer or use the Elecraft DL1). Measure the RF voltage
across the 50 ohm load (RF Probe reads in Vrms while a 'scope will
Jay, the Tek 492 will do the job IF you have an accurate way of
calibrating it and IF you know exactly the attenuation at all
frequencies of interest of the attenuator you will be using. I'm not
familiar with the '492... I have a 7L13, and on the 2dB scale the
divisions are .4dB.. which are
@mailman.qth.net
Sent: Sunday, July 03, 2005 5:10 PM
Subject: RE: [Elecraft] Accurate QRP Wattmeters?
The Elecraft Mini-Module DL1 Dummy Load has test points that allow you to
use a DMM to measure out put. I can't imagine anything in that price
range
being more accurate
73, KI4DGH
Chuck Gehring
Tom,
I believe I can answer that - the only thing you need with the DL1 is a DVM
and you can either use the formula or the graph from the manual to determine
the power.
In other words, yes the circuitry is built into the DL1, but a caution, you
will find the formula a bit different than the
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