[Elecraft] RFI on K3s

[Don Wilhelm]

Jimmy,

The voltage at your power supply may indeed be OK, but somewhere in the 
path to the K3, there is a huge resistance.

Possible causes:
- Lugs not tight at the power supply.  Tighten nuts with a wrench.
- Wire gauge inadequate for the K3 load on transmit - use #12 or better #10.
- Long power leads having too much wire resistance - related to above - 
use short wire.
- Incorrectly assembled Anderson Power Pole connector - look at the end 
of the housing.  If you can see the spring metal locking finger below 
the contact blade, it is not correctly assembled - push on the contact 
blade from the rear until the contact blade locks over the spring finger.

73,
Don W3FPR

On 6/20/2016 1:33 PM, James Walker wrote:
> This thread has lead me to notice the comments on operating voltage. I’ve been having some trouble with my K-3 and the MCU LD message on startup. It was suggested that I monitor the voltage on the rig during operation. I get the 13.5 on receive. But the voltage drops as low as 10.5 on 100 watt transmit. I have an Astron power supply that is rated at 35 amps, very conservative for this usage. I have used it to power 100 watt rigs in the past with no problem.
>
> Is it normal to register voltage as low as I’m seeing on my K-3? The power supply has meters for amps and volts and the voltage indicated during power cycles is unchanged. So it appears the voltage drop is at the rig. I can ever see dimming of the dial light in some situations. I don’t think the power supply is failing since I don’t notice these symptoms with any other rigs. And no, I never use the power supply for more than one rig at a time.
>
>