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-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net> On Behalf Of Tim Tucker Sent: Thursday, June 24, 2021 1:36 PM To: Elecraft Reflector <elecraft@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 <j...@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 > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net Please help support this email > list: http://www.qsl.net/donate.html Message delivered to > ae...@worldwidedx.com > -- Owner, worldwidedx.com AE6LX, Amateur Radio ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to k9...@live.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
