On Thu, Feb 20, 2025 at 01:09 PM, Richard Dyer wrote:
however the QMX+ still goes into protection
Any of the switched-element tuners will generate very high VSWRs as they search for a tuning solution; a manual tuner much less so.?
The worst is toggling the high/low Z switch, it presents an open circuit to the radio as it switches over; the only VSWR limitation is due to the losses in the tuner.
The VSWR probably trips more readily on the higher bands because the return loss bridge has poorer directivity there, showing a higher than actual VSWR, or maybe the tuner doesn't present as good a match.
73, Don N2VGU
Donald S Brant Jr