CM500, a good headset/boom mike, I bought mine at Full Compass for
under $40. It sounds beautiful on the K3 and is plug-n-play with bias
provided in the K3 menu.
Those EC folks thought of everything.
Dale, K9VUJ
On 13, Mar 2010, at 18:41, Jim Brown wrote:
> On Sat, 13 Mar 2010 14:56:47 +0000, Brendan Minish wrote:
>
>> Is there anything I can do to increase the magnetic shielding of the
>> amplifier? Will using 'Mu metal ' type material on the outer case
>> of the
>> amplifier in the vicinity of the PSU help?
>
> It is VERY unlikely that you can fix this with shielding. There are
> two
> good and simple fixes that you MAY make work. 1) Increase the distance
> between the field source and the mic. 2) Rotate the field so that it
> is
> perpendicular to the pickup field of the mic.
>
>> 2/ Is there anything I can do to improve the immunity of the the
>> dynamic
>> microphone element to the magnetic field ( I suspect there isn't.)?
>
> This is solved with pro mics by adding a "hum-bucking" coil that is in
> series with the mic element and out of polarity with it. I don't
> think it's
> practical with the DT-109. I don't know of any other good solutions.
>
>> I would really like to be able to continue ot use this headset, the
>> DT-109 headset
>
> I know those headsets well -- for many years, I've specified them for
> production intercom systems in the theaters for which I design sound
> systems.
>
> Something else you can (and should) do with the K3 is roll off the low
> octave bands in TXEQ. For most mics and most voices, the two lowest
> bands
> should be full cut on the K3. That's 16dB for each band, and if
> they're
> minimum phase filters, they'll combine to add a bit more. There's no
> useful
> speech content in those two bands, but that's the spectrum where
> breath
> pops and handling noise are prevalent. Indeed, many mics should also
> have
> the next higher band cut as well.
>
> Another headset that works VERY well with the K3 (and most other ham
> rigs)
> is the Yamaha CM500, which sells in the US for under $60 (I've seen it
> discounted at $40). If that is available to you, it's worth
> considering.
> Although some catalogs (including Yamaha's) list it as a dynamic, it's
> actually an electret.
>
> 73,
>
> Jim Brown K9YC
>
>
>
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