On Sun, Jun 9, 2024 at 04:59 AM, Andreas DM7AK wrote:
Hi Spencer,
first of all: be sure that the current limiter of your PSU does not kick in as it will drop the voltage and thus trash the measurements ;-)?
Current limiting was set to 0.850 A and I watched to ensure that it didn't kick in.? I've even set it higher than that, still same issues.
My 15m RF sweep looked similar in the first place - but it was shifted upwards a lot - but the shape of your sweep could indicate a wrong turn count on 401a: /g/QRPLabs/topic/106334083
Your 17m sweep looks like the 15m BPF configuration.
But the SWR looks really bad - as if no dummy load was connected at all. On the diagnostics screen you can press and hold the T key to actually transmit this should give some more data. And there is the P key which will only switch the diodes.
I'll do this and add screenshots to this thread.
It could also be SWR measurement itself that is flawed - how about the binocular twin-transformer?
I've looked at this carefully and detect no issues, but I haven't removed it yet and rewound it.
73, Andreas
