[Elecraft] RF Probe measurments - K1

Mon Feb 18 17:01:15 2002

I'm not at home right now, but the KAT manual said 14 volts.  Hmmm - maybe a
fudge factor needs to be added, but 1.8 volts ?!  Interesting when I made
the adjustment, the max voltage of 19 volts did agree with the formula for
7.2 watts.  Go figure !

Jamie
WB4YDL

-----Original Message-----
From: [email protected]
[mailto:[email protected]]On Behalf Of Dan Barker
Sent: Monday, February 18, 2002 2:14 PM
To: Elecraft
Subject: [Elecraft] RF Probe measurments - K1

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= E^2 / R .  Plugging
the numbers in : (14 v)^2 / 50 ohms = 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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