Try setting the K3's mic gain menu setting to 'low'.
Eric
elecraft.com
On 4/9/2013 9:49 AM, Jay wrote:
I just got a CM500 yesterday for testing and would say the MIC is
quite sensitive..only takes a MIC setting of 4-6 and its
fine...increasing MIC gain apparently does nothing but increase
feedback. I guess these powered headset are different than the usual
Heil Pro line as one can move the MIC gain up and down for a Heil and
watch the ALC go higher or lower.
The K3 ALC using the CM500 (at least here) remains constantly at about
6-7 bars (compression set at about 10-12 for best overall performance
so far)
The ear cover is complete not like my Heil Pro
I also like the strap across the head. The Heil has some cushion over
some type of strap that after a while it's noticeable. The CM500 has a
net like strap that is not hard, also allows air to move so no
apparent sweat build up after a 5 hour stint in 95 degree weather.
Took a lot of antivox and TX gate to quiet the feedback down during RX
modes ( I may have to take a footswitch for a multi op site)
Settings were : MIC rpl, impedance L (tap 1) , bias on (tap 2)
A nice 9 foot long card, plugs right in to rear panel, no adapters
needed (less to fail when on the road) , makes things easy when
traveling with the K3.
----- Original Message ----- From: "Michael Usher AG6MK"
<[email protected]>
To: "Fabio IZ4AFW / NZ1W" <[email protected]>
Cc: "Tom Boucher" <[email protected]>; "Elecraft reflector"
<[email protected]>
Sent: Tuesday, April 09, 2013 9:24 AM
Subject: Re: [Elecraft] Cheap headphones
They look to be virtually the same headset.
Visually, the earcups and headband are identical. The mic boom looks
to be physically slightly different. And the Koss has single side
cable, vs dual on CM500.
The CM500 I have has "Koss" molded on the 3.5mm connectors.
From website specs, the Koss has lower impedance (100 vs 120) and
slightly better sensitivity.
My bet is that the Koss would be a slight improvement on the CM500.
Michael
AG6MK
On Apr 9, 2013, at 5:58 AM, "Fabio IZ4AFW / NZ1W" <[email protected]>
wrote:
If anyone in EU decides to make a group buy of some CM500 headphones,
please let me know, I am interested in buying one.
I already have one for my K3 but another one would be welcome!
Thanks
Fabio
IZ4AFW / NZ1W
2013/4/9 Tom Boucher <[email protected]>
Dave G3TJP,
Re your post on non-availability of cheap headphones, the Yamaha
CM500 is
undoubtedly a preferred choice but is unavailable in Europe - the US
suppliers won't ship it to Eu either. A good alternative I found for
my K3,
is the Koss SB/45, which is quite comfortable during long periods of
contest operation and has an excellent quality electret mic. It's
currently
£20.98 free postage on Amazon.
73
Tom G3OLB
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