[Elecraft] SSB IMD

[Bill W4ZV]

Bill W4ZV wrote:
> 
> 
> Which reminds me...I set my power supply to deliver 14.5V at the input to
> my K3 terminals under load.  Although the power supply specification
> says...
> 
> "Supply Voltage/current: 13.8 V nominal during TX. (11 V min, 15 V max).
> 17-22 Amps typical in TX (100W). 0.9A minimum RX."
> 
> What is the voltage off-load when it is set like that?
> 
> ****It will depend on:
> 1.  Your specific power supply regulation.
> 2.  The resistance of the connecting cable (i.e. size and length).
> 
> ***I believe my drop is ~0.3V from 14.8 to 14.5, no-load to load.
> 
> 
> 
>> 
>> ...I would never intentionally run mine at the lower end of that range. 
>> If you have any concerns about overshoot when turning on your power
>> supply, always turn the PS on a few seconds before the K3.
>> 
> 
> But the K3 power switch is a "soft" switch isn't it, so some electronics
> are still connected to the supply even when the switch is off?
> 
> ***Since the applied voltage is never above the 15.0 spec, I don't worry
> about it.  If you're paranoid, you can disconnect the APP connector each
> time; or if you're concerned about wearing out the APP connectors,
> disconnect it at the power supply each time you turn the PS on.
> 
> 
> 
>> I tend to leave my PS on continuously so overshoot is never an issue.
>> 
> 
> ***Mine consumes 30VA even when no load is present, so for the sake of the
> environment everything here now gets switched off at the mains when not in
> use.
> 
> ***My shack is unheated in the winter, so the idle power is heating my
> shack.  :-)
> 
> The supply cable for the K3 certainly uses less copper than the ones
> supplied with JA radios. The PowerPole connectors seem a bit wimpy to me
> as well.
> 
> ***Nobody is forcing you to use the supplied cable.  A battery jumper
> cable should work nicely if you can figure out the connections.  If
> everyone in the UK is so paranoid, you can probably start a thriving
> business making special connecting cables ;-)
> 

73,  Bill

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