Because 12V is greater than 9V?
The 12V version has a different turns
ratio on the output transformer.? So while the voltages on the
output side are the same the voltages on the driver stage are
higher.? This also applies to reflected power, it comes back
through the LPF and the output transformer to become a higher
voltage on the driver side.? AIUI higher voltages are bad.
Chris, G5CTH
On 25/08/2023 19:52, Rick NF6G wrote:
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Why would 5W at exactly 9V, for the 9V version be ok, but 5W at
exactly 13V, for the 12V version, be dangerous? FWIW, I’ve ran my
QMX off a LiFePO4, transmitting with as high as 13.8V, but mostly
in the 13.2-13.3V range, with no problems. But to be fair, I’m
using a manual tuner. ?But again, it borderline feels like what
I’m reading, on a near daily basis, is running more than 4W at 12V
is a sin.?
