Just to complete the picture, I was away from the test for a bit and came
back to find the K3 turned off. It came right back when a reasonable
voltage was applied. Very likely, the voltage got too low at one point in
the transmission and sent the internal computer down. When it's down,
you're
The manufacturer has clearly, often, repeatedly stated, and keeps posted
their specification that the K3/K3S is designed for 11 to 15 volts.
Optimum THD is at the high end of that range. I have my supplies set at
14.4 VDC for this reason. This is also the bulk charge voltage for my "12"
volt
The K3 will actually continue to operate well below 11 V, which is rare for any
desktop transceiver. It will automatically reduce maximum allowed transmit
power output, to some degree, based on the supply voltage. This allows use from
a depleted 12-V car battery, for example. Our objective is
The K3 / K3S is rated to meet its specs with a power source between 11
and 15V. The problem with operating at low voltages is that the TX IMD
increases. Distortion of any type is one of the enemies of data modes.
Well, really, ALL modes.
I wouldn't operate the K3 / K3S much below 11.5V,
I'm running a test on my K3 with Olivia 8/500 data mode at 40 W output. The
duty cycle is 1/3 transmit (4 min) and 2/3 receive. A "LOW BAT" warning and
beep occur occasionally during transmit, however, the ALC remains at about 4
bars solid, one flickering. The voltage during receive is more
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