[Elecraft] Cheap headphones

Tue Apr 9 17:48:49 EDT 2013

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" 
> <ag6mk at muszka.com>
> To: "Fabio IZ4AFW / NZ1W" <iz4afw at iz4afw.org>
> Cc: "Tom Boucher" <tom at telemetry.demon.co.uk>; "Elecraft reflector" 
> <Elecraft at mailman.qth.net>
> 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" <iz4afw at iz4afw.org> 
> 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 <tom at telemetry.demon.co.uk>
>>
>>> 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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