[Elecraft] TX Calibration fails on 30m only

[Bob McGraw K4TAX]

I’ve found that one should use a 12” to 18” jumper of known good condition and quality.  Use this jumper to connect the dummy load direct to the radio. No switches, and no tuners in bypass mode.  

The dummy load should be 50 ohms +/- 5 (thats 10%)  ohms and be resistive.  Light bulbs and soldered up resistors and the like,  aren’t resistive, meaning no reactance.   Don’t take what’s written on the label as fact!  They change!  Measure them with an ohm meter and antenna bridge at several points from 1.8 MHz to 54 MHz.  Anything greater than 1.1 to 1 is out of tolerance.  

Run TX Gain cal on all bands.  Your results are only as accurate as your procedure and test equipment.  

Bob, K4TAX


Sent from my iPhone

> On Apr 7, 2020, at 10:59 AM, Bill Steffey NY9H <ny9h at arrl.net> wrote:
> 
> thought it good day to do a tx calibration.
> 
> I don't very often use 30 meters..    and today the calib quits at 30 meters saying  too high for calibration   4.1 swr...
> 
> All other bands indicate swr of 1.1 //  except 10mHz...
> 
> 
> I looked and the 10mHz low pass filter is shared with 14mHZ... and 20 looks ok. Don't know if the problem is in the tuner while in "BYPASS " for the test, or elsewhere.   Any help ???  searching found nothing for me.
> 
> 
> bill
> 
> 
> 
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