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Microphone capsule for K2

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Karsten Eppert (DK4AS)

Microphone capsule for K2

I have purchased together with my K2 an MH2 microphone short before it
was discontinued two years ago.
The reports I receive always state, that the mike has too much bass.
The filters of my K2 were checked with spectrogram and - to me - appear
correct.

In parallel I have tried a cheap boomset with an electret-mike. That
resulted in unfavourable reports like "sounds like a c-class-amplifier.
Too little bias current". So I checked the bias and it is ok.

Well - I?m looking for a good alternative now, but which one to select?

Go for a Heil Proset K2? I figure, that one contains the Heil
iC-electret-capsule. But what are the specs?

Go and replace the electret-capsule of my MD2 with a Heil HC-5-capsule?
What disadvantages will I have with such solution regarding frequency
response as the HC-5 apparently is a dynamic or condenser mike?

Can anybody share his experience with me?

73
Karsten
DK4AS
K2 #4764
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dave.wilburn

Re: Microphone capsule for K2

I recently went back through and addressed my SSB alingments. A couple
of important pieces of information that were passed to me, were;

A- set the bottom of the passband, so it starts a 300hz. This is a very
near thing and relates closely to B. I found, to get B correct, that I
had to set it so somewhere between half and three quarters of the slope
of the left side of the passband, was at the 300hz point.

B- once you have set the passband (both upper and lower) stick a piece
of wire in the antenna connection of another rig, and transmit K2 into a
dummy load. You can then make changes as needed.

I initially set the bottom of the left edge of the passband at 300hz,
and the signals sounded high and pinched. I then went back,
transmitting on the K2, and listening on another rig, and sorted it out.
Make sure and perform this on U & L sidebands and check it out on each
band. I had U sideband on 80m sounding good, even though this is not
used, but then U sideband of 20m did not sound right. It is sounding
more complicated that it really is. Once you start listening on the
other rig, it comes together fairly quickly.

Just be careful after all of this, if you have KDSP2 and the KPA100,
putting it all back together. I knocked a SMT cap off of my KDSP2 and
now it is KAPUT1. ;)
-

David Wilburn
[hidden email]
K4DGW
K2 S/N 5982

On Sun, 2008-01-06 at 13:29 +0100, Karsten Eppert (DK4AS) wrote:

> I have purchased together with my K2 an MH2 microphone short before it
> was discontinued two years ago.
> The reports I receive always state, that the mike has too much bass.
> The filters of my K2 were checked with spectrogram and - to me - appear
> correct.
>
> In parallel I have tried a cheap boomset with an electret-mike. That
> resulted in unfavourable reports like "sounds like a c-class-amplifier.
> Too little bias current". So I checked the bias and it is ok.
>
> Well - I?m looking for a good alternative now, but which one to select?
>
> Go for a Heil Proset K2? I figure, that one contains the Heil
> iC-electret-capsule. But what are the specs?
>
> Go and replace the electret-capsule of my MD2 with a Heil HC-5-capsule?
> What disadvantages will I have with such solution regarding frequency
> response as the HC-5 apparently is a dynamic or condenser mike?
>
> Can anybody share his experience with me?
>
> 73
> Karsten
> DK4AS
> K2 #4764
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft
>
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com

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dave.wilburn

Re: Microphone capsule for K2

In reply to this post by Karsten Eppert (DK4AS)

I have a MH2, and going back and reviewing the SSB passband and filter
alignment helped me quite a bit. It sounds fine, though I heard through
another on the list that they had success with their Proset with HC5
without the preamp. I tried it out with a friend listening, and it
worked just fine, and is now what I use. I do notice that it is
impacted by the nearness of the mic to my mouth, so it would likely have
more dynamic activity with a preamp, but I am driving to a full signal
with the current setup.

If you are not getting good reports with the MH2, then switching to
another, similar mic (or even the HC5) will not help. First thing you
need to do is check you passband, make sure they start at 300hz and then
listen to both U & L sideband on another rig.
-

David Wilburn
[hidden email]
K4DGW
K2 S/N 5982

On Sun, 2008-01-06 at 13:29 +0100, Karsten Eppert (DK4AS) wrote:

AJSOENKE

Re: Microphone capsule for K2

In reply to this post by Karsten Eppert (DK4AS)

In a message dated 1/6/2008 6:21:57 A.M. Pacific Standard Time,
[hidden email] writes:
I have a MH2, and going back and reviewing the SSB passband and filter
alignment helped me quite a bit. It sounds fine, though I heard through
another on the list that they had success with their Proset with HC5
without the preamp. I tried it out with a friend listening, and it
worked just fine, and is now what I use. I do notice that it is
impacted by the nearness of the mic to my mouth, so it would likely have
more dynamic activity with a preamp, but I am driving to a full signal
with the current setup.

If you are not getting good reports with the MH2, then switching to
another, similar mic (or even the HC5) will not help. First thing you
need to do is check you passband, make sure they start at 300hz and then
listen to both U & L sideband on another rig.
-

David Wilburn
[hidden email]
K4DGW
K2 S/N 5982

On Sun, 2008-01-06 at 13:29 +0100, Karsten Eppert (DK4AS) wrote:

web page: _http://www.elecraft.com_ (http://www.elecraft.com)

I have run the Proset HC5 and the Elecraft Proset Which has an electret mic
element and found them to both work well and also sound very much alike. I
ran the checks while beta testing the IMA (Internal Mic Adapter) produced by
UN-PCB. _http://www.unpcbs.com/_ (http://www.unpcbs.com/)

Al WA6VNN

**************Start the year off right. Easy ways to stay in shape.
http://body.aol.com/fitness/winter-exercise?NCID=aolcmp00300000002489
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