Read Bill's post carefully. Notice that he had no indication of the
effects of poor IMD due to low power supply voltage. You will *not*
hear bad reports from the stations you contact.
However, your signal will "splatter" over the band at frequencies away
from where you are transmitting.
Be kind to your ham 'neighbors' (and they do not have to be in close
proximity) and keep that power supply voltage up to reduce the transmit
IMD. Most Elecraft products will be happy with a power supply voltage
up to 15 volts. I recommend a power supply voltage of 13.8 volts (the
voltage of a fully and recently charged "12 volt" lead acid battery).
73,
Don W3FPR
On 12/29/2015 7:00 PM, Bill Mader wrote:
Actually, IMD in the PA increases significantly as battery voltage drops!
For example, during Field Day a few years ago someone kicked off the
generator power to our SSB station which kept operating on the back-up
battery. Sometime later the CW captain stopped by asking if we had changed
anything. He could hear "splatter" from our 20m signal on his 20m rig.
This was not the case earlier in the day.
I checked everything and discovered the AC power issue. I turned the outlet
switch back to On and checked with the 20m CW operator. His reception had
immediately cleaned up! He no longer heard anything from 20 SSB the rest of
the (non-contest) event. BTW, we went on to take 4th place overall with
just six transmitters (2012).
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