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List:       elecraft
Subject:    Re: [Elecraft] Signal analysis with the P3
From:       F5vjc <foxfive.vjc () gmail ! com>
Date:       2014-04-30 7:45:57
Message-ID: CABuWoS8KSkS9eJ3RY_E2kXCmu10UwHJc57aYf+tzTKL5p5k7zw () mail ! gmail ! com
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Interesting,

So, given a decent mic insert the overall audio response is very much
coloured by the housing of the the insert...

Close talking a mic gives a better S/N ratio, less background noise and
room colouration, but yields too much bass due to proximity effect?

How to overcome too much bass (besides moving further from the mic)?

What effect do pop shields and the various muffs have on the sound?
.
I do understand and practice Tx audio EQ to restrict the Tx BW to 2.8-3kHz
and attenuate useless audio below say 200Hz. for maximum communications
efficiency.

I'm interested in good communications microphones and technique, but not in
spending, silly money (hundreds, thousands) when a decent mic insert can be
 had for pennies, (almost).

I'm not interested in ESSB, done well or otherwise.

A good clean  3KHz SSB signal stands out and is very noticeable on our
bands today.

There are some very knowledgeable audio and broadcast people on this list
and I'm always keen to listen to their opinions.

73, F5VJC


On 29 April 2014 20:53, Joe Subich, W4TV <lists@subich.com> wrote:

>
> On 4/29/2014 12:32 PM, Fred Jensen wrote:
> > Not sure it is limited to dynamic mics.
>
> Proximity effect is not limited to dynamic mics.  But it seems to be
> more common with dynamic mics used for amateur service because the
> electret has both a higher output level and more low end to start with.
>
>
>  I recorded myself using his velocity mic [the large iconic RCA which
>> had a prismatic shape] on an Ampex 350 at varying distances. As I got
>> closer, I became more and more a bass.
>>
>
> I took every advantage of proximity effect when I started in radio.
> I had an overnight air shift - I worked the mic as close as I could
> and kept my voice level down in order to generate that more pleasing
> "low, soothing tone".  When it came time to rip and read the news, I
> backed off, talked louder and faster - almost sounded like a different
> person.
>
> 73,
>
>    ... Joe, W4TV
>
>
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