Jimmy,
I did not make any reference to any switching supply. I have the same
supply, sans meters.
The meter on the power supply is reading internal to the supply. Check
on the outside with your DMM.
The terminals on that supply are bolts with the heads on the inside.
Those bolt heads apply pressure to the solder lugs on the inside. If
the nuts on the outside (the ones closest to the enclosure) are not
tight, there will be considerable voltage drop during transmit. The
connections made on the outside must also be tight to assure a low
resistance.
It is a simple matter to connect your DMM and monitor the voltage as you
transmit.
73,
Don W3FPR
On 1/29/2017 9:57 AM, James Walker wrote:
I tried the direct wiring fix first. It didn’t change anything. And
the voltage drop was radical. It would go down sometimes from 13 to 11
volts. The voltage drop was not indicated on the power supply volt
meter. And remember, the big Astron power supply works fine with my
IC-7300 and IC-746 off the Rig Runner strip. Maybe those rigs work
better with the voltage variation. But something is going on here with
either the power supple or the K3. I paid about $200 for the big power
supply back in the 90’s. I think the little Astron supply (switching
type) was less than $100. Maybe the difference is between transformers
and switching technology. Anyway, my nightmare is over with a happy
ending.
Jimmy
On Jan 28, 2017, at 10:27 PM, Don Wilhelm <donw...@embarqmail.com
<mailto:donw...@embarqmail.com>> wrote:
Compare the voltage directly at your power supply terminals between
receive and transmit. If it stays up, then check your power cable to
the K3 for adequate size wire and good connections. If you have a DC
power distribution device like the RigRunner, remove the K3 from it
and connect direct from the power supply to the K3.
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