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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