[Elecraft] K3 Voltage drop

[Bill W4ZV]

Ron W3ZV wrote
> 
>  Noted that the voltage on RX was 13.6. Dropped to 12.6 with 75 watts RTTY
> TX. Supplied power cord to an Astron RS-35M. I am concerned that the drop
> may be excessive. I'd like to make sure that there is a problem before I
> start tearing into things. Cause for concern?
> 

This recently came up on the Yahoo K3 list where N4PJ reported a 1.0V drop
using a RS-35M (13.6 to 12.6 key down).  I also use the RS.35M and my drop
is 0.4V (14.6 to 14.2 with 110W key down).  I'd check that your connections
at the RS-35M are solid.  Many of these hum slightly which can cause the
nuts to loosen slightly over time.

I run my voltage higher to improve TX IMD performance on SSB.  Elecraft's
maximum spec is 15V.  There's  a wheeled pot on the underside of the RS-35M
control board (or any Astron for that matter) which adjusts the output
voltage but be careful when adjusting it!

73,  Bill W4ZV

--
View this message in context: http://elecraft.365791.n2.nabble.com/K3-Voltage-drop-tp7318310p7319046.html
Sent from the Elecraft mailing list archive at Nabble.com.