[Elecraft] Heil Pro 7 headset with KX3 - RF feedback?

[hb9cvq at hispeed.ch]

I use mostly Heil Headsets for a long time. My latest with the FTDX101MP is Heil RED Pro 7 (with red contest cartridge) . 
Right after the TRX audio output and mike input I always have a Ferrite N30 7 windings on each shielded cable. 
The monitor (listening to SDRs e.g.) plug/shielded cable is blocked right at the headset with a small N30 core. 
The 1.5m long shielded audio cable goes to my station notebook. 
All is several times ferrite blocked and separated by a suitable audio transformer before going into the computer audio out.

I also own a Bose Aviation A20 Headset (over 1K$) with super active noise cancellation. 
Guess what, into the spiral shielded cable I had to put a 10cm ferrite rod ( Hi permeability, positioned toward electronic battery unit ) to finally kill all RFI. 
It goes without saying mike cable and phone cable are both ferrite core blocked right at the transceiver K3S.

In my Club CW Contests and FD I use Bose Quiet Comfort 25 (260$ around at that time?) - with N30 ferrite at the radio... I needed to build an extra audio attenuator to get to my wanted very low audio level.

My other older Heil (Headset) systems have all ferrite cores towards the radio.

Bose is most comfortable in my opinion...


Tnx, Cu, vy 73 de Andy
HB9CVQ, DK2VQ, AK4IG

https://www.qrz.com/db/HB9CVQ




-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On Behalf Of Jim Brown
Sent: Freitag, 18. Juni 2021 02:29
To: Reflector Elecraft <elecraft at mailman.qth.net>
Subject: Re: [Elecraft] Heil Pro 7 headset with KX3 - RF feedback?

On 6/17/2021 2:12 PM, Hank wrote:
> I dislike my CM500’s. They are uncomfortable to wear for an extended period of time. 

That's a GREAT reason for not liking them. And comfort in headsets is a very individual thing -- all of us a built a bit differently. I had that experience when I tried on the very expensive aviation-style headsets which are being sold to hams, and which some guys find quite comfortable. And after a few years when I heard a local contester saying how comfy they were, I tried them on again at a hamfest, with the same result. :)

I do have RFI issues with them when running full power on HF SSB.

What makes you certain that either headset is related to the RFI issue? 
There are MANY mechanisms that can be the cause, especially failure to do proper bonding.

73, Jim K9YC

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