Your Bird 43 is likely far less accurate than your HP. The elements include a potentiometer that is prone to shifting or going ¡®rusty¡¯. Some even fail open circuit. I took an element apart once and was shocked at how highly geared the 10 cent pot was - from memory needing about 20k of 100k full range.
Find a properly calibrated power meter before you touch your 8920. Mine was within a percent or two after over a decade without cal.
If anything, adjust your Bird. But then you have two challenges: fiddling with the element, or the meter, as they both have adjusters.
73, Colin G4CWH
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On 8 Jan 2024, at 07:11, William Macham via groups.io <westwill1@...> wrote:
?Hello all,
I have finally got my instrument going well, NO FAILURES :)
The one thing left is to adjust the reading to agree with the value of watts at the rf input, measured with my Bird 43 watt meter.
I presume the adjustment is in the "Configure" menu ... ?
Can someone advise me as to the procedure to make the correction? 27.6 watts in @ 144 Mhz, reads about 21 on the screen.
Regards
Bill M. VK6IC
