[Elecraft] power issues

[Mel Farrer]

The rule of thumb is to over design the system.  I have nearly the same system with a few differences.  I don't use a distribution panel,  rather my 2x 140 AHr batteries and the solar panel are netted at the 
K3 with a 5 Farad cap 12" from the K3.  I monitor the voltage at the connector of the K3 and only see a .1-.2 volt drop from resting to key down.  So YES make all leads HEAVY and short.
Mel, K6KBE


      From: George Thornton <gthornton at thorntonmostullaw.com>
 To: Ron D'Eau Claire <ron at cobi.biz>; 'Bob Jonas' <wx2i.nnj at gmail.com>; "elecraft at mailman.qth.net" <elecraft at mailman.qth.net> 
 Sent: Saturday, February 4, 2017 4:17 PM
 Subject: Re: [Elecraft] power issues
   
I did some checking today on my voltage to the K3 using two different routes.

I am using an Astron RS-35m power supply.  It was tuned up to output slightly under 14v.  Normally it mediates through a PG40s backup and switching device, connected to three 140AH backup batteries as well as the power supply.

When I connect the K3 power through the PG40S distribution panel I read 13.3 volts at the K3.  This drops significantly when I transmit, going down to under 12 volts.

I then direct-wired the K3 lead to the Astron using ten gauge wire and a relatively short lead.  Power at the K3 then reads 13.8 and drops only to 13.7 during transmit.

Since I had failures attributed to erratic power supply, my conclusion is the K3 should only be run via a short, large gauge lead direct to a power supply in good order.


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