[Elecraft] KX3 external battery (Maxtron) VERY NOISY

[Dominic Baines]

Yeah it is an oxy moron sometimes... operate off grid using a battery 
and you get noise (this will be the internal LiION battery 
recharging/regulation circuitry causing it).

Have you tried adding ferrite to the DC leads (and weirdly to the 
headset leads, I need to if using ext battery sometimes). You could make 
up a simple choke and plug your rig power lead into that, doesn't need 
to be in a box or anything... leads from battery then 12 turns of the 
power leads or so in opposite directions in parallel on the ferrite (try 
FT240-61) to a set of connections to the rig. Or a string of those 
little 5mm ID clip on ferrites (ebay) on the Elecraft lead.

72

Dom
M1KTA
Owner of #1082 & #2334
On 06/03/15 04:53, Robert Sands wrote:
> A reflector poster mentioned the Maxtron  MX 160A for use with the KX3. I
> got one off Amazon and tried it. My noise level jumped from S4 to S9.Not
> sure how to eliminate it.Nice otherwise.Transmit plug it in. Receive, pull
> it out.
> Robert E. Sands
> K7VO