[Elecraft] SSB IMD

[K8RDD]

I found while assembling my K3 that the crimp connectors that go on the
circuit breaker were not crimped well. They pulled out very easily. I
replaced them. I go from 14.3 to 13.7 on the front panel voltmeter display
at full power out. I see no worse than -31db 3rd imd on my old HP analyzer.
It hasn't been cal'd in a while but my other rigs are about the same except
my old Ts-830. Of course it's better. I love that rig. But I can't seem to
get the cat interface to work.
Randy
K8RDD 



Julian, G4ILO wrote:
> 
> 
> 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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