[Elecraft] K4D #150

[Bill Johnson]

The background noise among other issues is why I switched to cardioid mic from Heil.  Directional, excellent sound reproduction.  

Bill
K9YEQ

-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On Behalf Of Tim Tucker
Sent: Thursday, June 24, 2021 1:36 PM
To: Elecraft Reflector <elecraft at mailman.qth.net>
Subject: Re: [Elecraft] K4D #150

I use a Heil GM5 mic, with the gain and compression adjusted so my lips have to be almost touching the windscreen to drive the rig.  When a fan blower from a big amp is going right underneath the rig, there is a limit to gain and compression adjustments that can be made to get rid of that much background noise.  Plus a room with hard floors makes the problem worse (although I do have throw rug down).  This is the type of environment where downward expansion shines.

Phase Inversion:  Perhaps I wasn't clear:  For some reason with my setup, this Heil GM5 mic produces negative deflection on a power meter when using AM.  Example:  you set the AM carrier at 25 watts, expecting modulation to
100 watts, but instead you observe 25 watts deflecting to 15 watts.  I don't know why that occurs, but I do know that flipping the Invert phase switch solves the problem.

Tim

On Thu, Jun 24, 2021 at 11:13 AM Jim Brown <jim at audiosystemsgroup.com>
wrote:

> On 6/24/2021 6:48 AM, Tim Tucker wrote:
> > Downward Expander is the most valuable,
>
> That can reduce room noise you transmit in a noisy shack, especially 
> if you've set compression too high, or work too far from your mic. 
> Using a boom mic headset like the Yamaha CM500, that puts the mic a 
> couple of inches from the mouth does a lot to minimize the need for that.
>
> phase inversion
>
> Correctly called "polarity," this does NOTHING to improve (on the 
> iPlus) on
> > AM (when needed), and I've found that the compressor just works 
> > better
> (at
> > least on the K3).
>
> I could believe that.
>
>   There are other minor interesting features, but the
> > reader can do their own feature comparison
>
> With the possible exception of better compression, everything else is 
> a way to extract money from those who don't understand audio.
>
> 73, Jim K9YC
> EE, Fellow of the Audio Engineering Society
>
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