I know I've seen an explanation somewhere, but it's common to have
different readings between the tuner, amp and rig when connected to an
antenna. Readings seem to even out when connected to a dummy load...at
least in my case. 20 meters is my worst, and the amp will kick out at times.
On 11/17/2019 2:19 PM, Bob McGraw K4TAX wrote:
Jack, et.al.
Thanks, Yes I see from the circuit it is not a Breune. I have
calibrated the indications for power and all is well in that regard.
I just see a higher SWR that actually exists. That under certain
conditions causes the amp to fault. I'll figure a work-a-round and
be able to deal with it.
73
Bob, K4TAX
On 11/17/2019 10:12 AM, Jack Brindle wrote:
Bob;
The KPA500 does not use a Breune style bridge, but rather a true
directional coupler. It does not need to be nulled; there is no
adjustment.
There is an adjustment for the power; see the PWR ADJ setting in the
manual.
73!
Jack, W6FB
On Nov 17, 2019, at 6:58 AM, Bob McGraw K4TAX <[email protected]>
wrote:
I need to null the SWR detector on my KPA500. I've not found any
adjustment procedure as such. And from the schematic, there is none.
I do have a rather precise Bird 50.5 ohm dummy load. I see SWR
values higher than 1:1 on the LED display and also on the LCD
display on higher frequency bands. I've found that the PWR ADJ
does affect not only the indicated power but the FAULT values as
well. I am suspect that the SWR error likewise affects the Fault
actions.
Any thoughts?
73
Bob, K4TAX
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Joe Hutchens
AJ8MH - Radio
Marquette, MI
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