[Elecraft] The ERR 12V Message Question

[Bob McGraw K4TAX]

First, check all power connections.   And if your radio is powered 
through a DC distribution strip, my suggestion is to not use the strip 
for the radio power.   In other words, connect the radio power cable 
direct to the power supply.    Also shorten the power cable to be more 
convenient and have less voltage drop. It is a law of physics;   more 
wire, more connections = more resistance = more voltage drop for a given 
value of current.  Thus Ohms law  is E = I x R    {Those power 
distribution blocks are most often very problematic, regardless of what 
the advertising, or rating,  or sales person said.}

As to 10 watts, there is a K3/10 model which is a 10 watt radio. 
However, like the 100 watt version it should not be run at 100% power or 
otherwise 10 watts for FT-8 for a 10 watt radio.   When you turn the PWR 
back to 12 watts or so with a 100 watt radio, you will hear a relay 
click.  This is the switching of the KPA3 {100 watt amp} out of the 
circuit and then LPA is used as the PA.   It is rated for 10 watts.  I 
wouldn't suggesting running it at 10 watts no more than I would suggest 
running the KPA3 at 100 watts in the FT-8 mode.   About 50% rated power 
is a safe value.

As suggestion, remove the covers and remove the KPA3, examine and clean 
the power connectors and put it back in the radio.  This might solve the 
issue and be good for another few months.   Of course replacement of the 
power connectors is preferred for long term service.

73

Bob, K4TAX


On 7/2/2019 18:07, Joseph M. Durnal wrote:
>> I'm not sure if I am experiencing the KPA3 power connector issue or
>> not.  I've gotten the ERR 12V message twice today.  Powering the K3
>> off and on again will clear the message, but it came back, but cleared
>> again after a power cycle.
>>
>> And, as I type this while transmitting some FT8 in the background, it
>> gave me the error message again.  The full Elecraft K3  KPA3 Power
>> Connector Replacement  procedure looks like something I won't have
>> time to do until next month, is there a quick bandaid I an try until
>> then?  Also, is it safe to use the K3 at 10 watts until I get it
>> fixed?
>>
>> Thanks & 73 de Joseph M. Durnal - NE3R
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