[Elecraft] Connecting Headset Aviation Bose A20 to K3S?

[Jim Brown]

On Wed,8/3/2016 5:25 AM, Andy D. Hansen wrote:
> I intend to buy a (1K$) noise canceling Headset to suppress the very
> disturbing FAN noise by my KPA 500 in QRQ > 30/40 Wpm  CW Mode. Changing of
> FAN + external Fans not successful.

I don't understand this, and I think it's at the heart of your problem. 
I strongly suggest that you correct the cause of this rather than 
spending big money on a noise cancelling headset. Have you communicated 
with Elecraft about this?  My KPA500 fan runs at high speed ONLY during 
long keydown transmissions (like JT65, for 50 seconds, then 70 seconds 
off) and when "beacon-CQing" on 6M (efficiency is lowest on 6M, so 
heating is greatest). It's hard to imagine this being a problem below 
15M unless you're making very long transmissions.

> Will this work with the K3S.

I see no reason why not.

> Bose says EMI /EMC should be ok for HF.
I don't know -- RFI to the shack tends to be greater if TX antenna is 
close to the shack, especially with an end-fed antenna that terminates 
in the shack.

> I understand DC Bias 8V is no problem.
Right.
> How about the Stereo 320 Ohm Earphone impedance and the K3S recommended 16
> Ohm min ?
320 ohms is >> 16 ohms, so no problem.

> How should the electret mike be configured Bias through 220 to 2200 Ohm?
Wire the mic with "hot" to the tip of a 3.5mm TRS plug, plug it into the 
rear panel, go to the menu and select rear panel, then while still in 
the menu, tap "2" on the keypad to turn on bias. Then exit the menu.

> Any experience here?
Only as cited above.

73, Jim K9YC