[Elecraft] K3/100 Voltage Drop when transmitting

[Don Wilhelm]

Jimmy,

Astron power supplies have a nasty habit of having loose wiring 
terminals.  They use only pressure to hold the ring terminals on the 
inside to the terminal bolts.
If you can detect even a slight rotation of the bolt when tightening 
terminals on the outside, remove the covers and tighten those bolts from 
the inside.

The other problem is improperly assembled APP connectors.  If you look 
straight into the end of the connector, if you can see the tip of 2 
blades in either side, give the contact blade an extra push from the 
wire side until the contact blade locks over the locking tab.
That is also a cause of APP connectors which tend to pull out with very 
little tension.

73,
Don W3FPR

On 2/25/2019 2:12 PM, James Walker wrote:
> I have a K3 that behaves similarly to what Mike described. I switched from an Astron 25 amp (15 years or more old) power supply to a switching power supply. Problem solved. One would think the problem was my Astron power supply, but I don’t see any such power drop when I use my Astron with other 100 watt rigs. Very strange.
> 
> Jimmy Walker, WA4ILO
> Macon, GA