IMHO you can try with a bolometer, wich is a milliwatt-meter, an some good
attenuators capable of handle the power levels that you are going to use...
An HP432A is a good instrument that you often find on ebay for less than
200,00 USD (thermistor head included).
If You are going to do some serious
0.4W ...
-Message d'origine-
De : [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] De la part de Andrew Moore
Envoyé : 2 mars 2005 16:15
À : elecraft@mailman.qth.net
Objet : [Elecraft] KX1 says PO.4 -- is this 0.4 W or 4 W?
Testing my KX1 with internal antenna tuner... When in tune mode the
0.4W ...
I was afraid of that -- I recalibrated the tuner with a 50 ohm dummy
load and now it's showing 1.9 W when running on batteries, which sounds
correct. I will further calibrate when I have access to a known
accurate wattmeter.
Thank you for clarifying.
--Andrew
If you have the Elecraft dummy load, you will be able to connect your
DCmeter and with the simple formula, calculate a good average of your
output. Power meter have always at least 10% error... so with your
meter and the DL, it will be more accurate
Le 05-03-02, à 17:02, Andrew Moore a
Andrew,
That elusive 'known accurate wattmeter' may be a challenge to find -
especially at the power levels you are attempting to measure. Many (most)
wattmeters spec the accuracy as a percentage of full scale - so if you use
one good for 10% on a 50 watt scale, the error can be as much as 5
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