Jim,
Get your DMM out and make the same measurement at the power supply
terminals.
If you see a substantial voltage sag during transmit there, you can
blame the power supply. But if the voltage stays close to constant, the
problem is voltage drop in the power cabling.
The RigRunner will contribute some drop due to the extra contact points
and even #12 or #10 wire has some resistance.
If the power supply is good, run a power cable direct from the power
supply to the K3 and run another power cable to the rigrunner. Run the
accessories in the shack from the rigrunner.
73,
Don W3FPR
On 3/9/2017 8:09 PM, James Bennett wrote:
Hi All -
Haven’t had any issues with the above configuration. Until today, when I
happened to punch the K3 DISP button, changing it from reading my VFO B
frequency to the other various bits of information. One of them was the rig
voltage. Sitting there on 17 meters in CW mode receive it was showing a nice
13.8V. Cool. I hit the key and - wait a minute…… it dropped way down to 12.4v.
Huh - not so cool. My first thought was that the Boost Regulator was not doing
it’s job. But I decided to start trouble shooring at ground zero - the MFJ
4245. I disconnected it from the Power Gate and ran it directly to the K3. Key
up = 13.8V. Key down = 12.0V. Yikes! I think (IMHO) calling this poor
regulation (15%) would be a gross understatement.
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