Re: [Elecraft] KX3 external battery (Maxtron) VERY NOISY

2015-03-06 Thread Bob N3MNT
Yup. It is not a 12 or 13.8V battery, but rather a low voltage source that has a switching circuit ( aka noise) that generates the higher voltages, These are designed to do as advertised and charge phones and tablets at relatively low current. If you want battery operation, an SLA or LIFE

Re: [Elecraft] KX3 external battery (Maxtron) VERY NOISY

2015-03-06 Thread Jim Brown
On Fri,3/6/2015 12:43 AM, Dominic Baines wrote: 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). Probably so. Have you tried adding ferrite to the DC leads (and

Re: [Elecraft] KX3 external battery (Maxtron) VERY NOISY

2015-03-06 Thread 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

[Elecraft] KX3 external battery (Maxtron) VERY NOISY

2015-03-05 Thread Robert Sands
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