Hi Bob,
thanks for sharing this. I am a happy user of ANTLION MODMIC mic with my
BOSE QC25, the only down point is that now I have 2 cables going from the
headset to the radio or interface.
Let me see if I get this right, your mod to the ClearMic adds a separate
wire from the headset to the rig mic?
73's Filipe Lopes
CT1ILT - CR6K
F4VPX - TM3M
2016-04-18 18:34 GMT+02:00 Bob Henderson <bob.5b4agn@gmail.com>:
> I am one of those who purchased a ClearMic for QC15 from Headset Buddy only
> to find problems due to feedback between headphone output and mic input
> made it unusable for SO2R.
>
> I contacted Headset Buddy to explain their ClearMic was incompatible with
> my radio set up. I use a pair of K3s. They offered me a full refund
> inclusive of shipping costs and told me to keep the mic.
>
> The ClearMic languished in a corner of the shack for a while before I
> decided to investigate the problem. It quickly became apparent this was
> due to use of a high resistance ground lead shared between mic and
> headphones. The lead is 1.2m in length but the screen (shared ground) has
> a DC resistance of roughly 1 ohm which is enough to see a proportion of
> headphone audio shared with mic output.
>
> I solved the problem by cutting the supplied lead around 7cm from the plug
> which attaches to the QC15 phones. I re-used the lead I had just chopped
> off for the headphones and paralleled a separate single core screened cable
> for the mic.
>
> With the mic and QC15 grounds now separated the feedback problem is solved
> and the ClearMic QC15 works very well.
>
> I guess a few other folks might have ClearMics sat around waiting to have
> their grounds separated.
>
> 73 Bob, 5B4AGN
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