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 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.
#61 is a VERY poor choice for suppressing noise at HF. #31 and #43 are the weapons of choice for the HF bands.
Or a string of those little 5mm ID clip on ferrites (ebay) on the Elecraft lead.
Strings of beads or clip-ons are NOT effective at HF. Study k9yc.com/RFI-Ham.pdf 73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
