Phil,
If you can get 3.5 watts or greater with a 13.8 volt supply, the KX1 is
performing better than specifications.
I would hesitate before trying to get 5 watts or greater out of it
unless you are willing to re-design the low pass filter and install LPF
capacitors with a higher voltage rating.
I know hams have a habit of 'squeezing all the juice', but that may
shorten the life of the PA components, especially when they are
subjected to the higher RF voltage peaks present when the SWR is increased.
73,
Don W3FPR
On 8/22/2013 1:23 PM, PHILIP GRAITCER wrote:
Last week, I asked for the group's help when I was in the field with a KX1 and
an antenna that wouldn't tune. Here's my report.
I trimmed the 66' wire that I have used as an End Fed Half Wave (with other
rigs and tuners) to 41 feet, added a 15 foot counterpoise, and the rig tuned
just fine.
I was unable to do anything about the input voltage, since I lacked a coax jack
that would have let me feed in 12 volts, instead of the internal 9v from the
Lithium AA cells. So the power remained at about 1.8-1.9Watts. SWR was below
1.5, according to the KX1's display. I had left the 3S Lithium battery pack at
home partly out of laziness, partly because of my fears of losing it in airport
security.
I did make a few contacts, so - mission accomplished.
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