[Elecraft] RF Probe measurments - K1

Mon Feb 18 15:16:01 2002

My KAT2 book said 15.8 volts. What revision you reading?

>From the website, The Rev D manual (3/22/01) also says 15.8. My =
calculator agrees!

Dan / WG4S / K2 #2456

-----Original Message-----
From: [email protected]
[mailto:[email protected]]On Behalf Of James C. Hall, MD
Sent: Sunday, February 17, 2002 10:23 PM
To: [email protected]
Subject: [Elecraft] RF Probe measurments - K1

Hello:

Today I built an RF probe to calibrate power output on my K1 after =
adding
the antenna tuner unit.  In the instructions for calibration, the 5.0 =
watt
setting on the meter is to corrolate to a DC volt reading of 14 volts =
using
the probe on the center pin of the dummy load.  My question is how does =
one
come up with that corrolation, since the equation is P=3D E^2 / R .  =
Plugging
the numbers in : (14 v)^2 / 50 ohms =3D 3.92 watts.  Where is the =
missing
volts ?

My probe saw 19 volts at max output which corrolates to 7.2 watts out - =
and
that's what the meter shows as well.

Neat beginner project - the RF probe !

Jamie
WB4YDL

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