On Thu, Apr 3, 2025 at 04:28 PM, Michael Shiplet wrote:
I am getting some strange power readings across all the bands, and my SWR readings are all over the place
I would start by doing (from the Hardware tool page of the terminal app):
- LPF sweeps of each of the bands
- SWR sweeps of each of the bands
both with a dummy load attached.
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But first make sure you didn't forget to install the jumper across the middle pads of JP501 by the BNC.
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Look not only at the shape of the curve, but also the left-axis labels.
For SWR all bands should give between 1.0 and 1.2 at the band frequency, and most of the way across the display; except on the higher bands it will be higher above the band frequency.
For the LPF sweeps, the left axis should show something near 0dB (or a few dB positive) at the top, going down to -30dB or so at the bottom.? And there should be a reasonable LPF shape.? If the left axis is all around 0 dB top and bottom, it means you are not getting any tx power out then back through T507 back to the processor to measure.
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So in addition, re-check all soldering of T501, T507, and L502 - a fault in any of these will cause havoc with TX on all/most bands.? Faults in single bands are more likely in the LPF toroids and their diodes.
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