David,
I think the answer to your question is a matter of degree.
I do not have any specific test data on the IMD increase as the DC
voltage is reduced, but it is a fact that the IMD with 'nominal 12 volt'
transceivers will worsen as the voltage drops.
The fact that the K3 IMD is better than most other transceivers also
says that the IMD as the voltage goes down is better on the K3 than others.
If you are concerned about it, I suggest you reduce the power to
something like 75 or 80 watts when your power source voltage decreases.
The difference between that power and 100 watts is likely not to be
noticed by the receiving stations.
73,
Don W3FPR
On 12/22/2014 5:50 PM, david Moes wrote:
I'm just curios is there any real test data available showing what
IMD may be present at various supply voltages? I have heard many
comments on the reflector over the years saying to keep the voltage
high one member saying to keep it at 15V. The specs say 13.8 V
nominal during TX. (11 V min, 15 V max) I would think that the
transmit signal should be fairly clean within this range.
At home its on a regulated supply 13.8 so NP but at the cottage
where there is no utility power its on a battery with 6 and 10ga
wiring all using solar charge. At night I will see voltages drop to
about 12V after operating with lighting from the same battery for a
while usually about 1:00 am in a contest. this is when I go off the
air and to bed, as this is typically about when the battery reaches a
40-50% charge and I don't like to go below this. is operating
approaching 12 volts (transmit) really an issue?
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