[Elecraft] K2 #4293 KAT2, KNB2 etc.

[Jukka Tarvainen (OH4MFA)]

Thank You Don!

I did R1 adjustment during lunchbreak using RF-probe and got it about right.
I will check cantenna resistance afterwards and re-adjust if necessary.
I was worried about breaking RF-probe, but now I believe I can connect it
with dummy load and can't connect it directly to antenna jack.

73 Jukka, OH4MFA
K2 #4293

>--Alkuperäinen viesti--
>Reply-To: "Don Wilhelm" <w3fpr at arrl.net>
>From: "Don Wilhelm" <w3fpr at isp.com>
>To: "Jukka Tarvainen (OH4MFA)" <jukkaotarvainen at suomi24.fi>,
>	<elecraft at mailman.qth.net>
>Subject: Re: [Elecraft] K2 #4293 KAT2, KNB2 etc.
>Date: Mon, 21 Jun 2004 09:16:36 -0400
>
>
>Jukka,
>
>Why not just use the RF probe built from the parts supplied with the K2
kit
>and you will have an instrument that you can trust?  The RF probe built
into
>the Heath cantenna MAY be the same thing, but I just can't recall how it
>is
>configured.
>
>Then you can use the RF probe (and your DMM) connected across the dummy
load
>to measure the rms RF voltage and determine the power output = V*V/R. 
(The
>DMM should read the rms value of the RF voltage directly for voltages above
>about 1 volt)
>
>Of course, you must know the resistance of the dummy load accurately too
>if
>you are expecting to do an accurate calibration.  For a dummy load to be
>a
>true dummy load, it must be entirely resistive (no reactance) at the
>frequency it is being driven.  The old Heath cantenna is only OK in this
>respect, and I have heard reports that the resistance does change a bit
with
>age.  (You can check a dummy load by measuring it with an antenna analyzer.)
>
>73,
>Don W3FPR
>



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