[Elecraft] Funny K4 Story i.e. SWR

[Ray]

I Though it was 52 Ohms ?  

WA6VAB   Ray K3 #3824 

From: Bob McGraw
Sent: Wednesday, May 19, 2021 1:43 PM
To: elecraft at mailman.qth.net; tom at w7sua.org
Subject: [Elecraft] Funny K4 Story i.e. SWR

Most all SWR meters relative instruments.  Meaning they provide an 
indication in terms of ratio of one value of voltage to another value of 
voltage.  Thus better described as VSWR indication.

As to measurement of power, most all are calibrated to operate in a 50 
ohm circuit.  Departure from 50 ohms, where one uses the power 
indication post tuner, will yield an error which is sometimes 
significant, in the power indication.

73

Bob, K4TAX

Message: 10
Date: Tue, 18 May 2021 08:44:01 -0700
From: Tom Azlin W7SUA<tom at w7sua.org>
To:elecraft at mailman.qth.net
Subject: Re: [Elecraft] Funny K4 Story
Message-ID:<aefcac35-9173-0eb2-3ee9-2f83aabd1844 at w7sua.org>
Content-Type: text/plain; charset=utf-8; format=flowed

I have an external meter on each of my antenna feedlines so I know the
actual SWR for each antenna. Also see a difference in the reported power
out on my (still) K3 versus the power reported on the external SWR/PWR
meter.

Tom w7sua


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