RE: [Elecraft] Microphone preamp and Heils

2007-02-16 Thread Don Wilhelm
Dave,

As far as the connections to the mic, yes, you will be 'good to go' if you
use the Kenwood adapter and wire the K2 for the Kenwood configuration..
Whether you will want a preamp or not with that HC5 element is an entirely
different question.  For use with your HC5 element Proset, you might want to
make the changes to the KSB2 board suggested by Jim Brown - Jim is an expert
in the Pro-Audio field and has done a lot with ham radio too, so if Jim
found those changes helpful, I do not boubt his word, in fact I may make
those changes here too just to see what happens.  In any case, you do not
have your K2 completely built yet, so do not modify anything until you
complete the kit and have things up and running.

Of course, there is another alternative if you use only the boom/headset
type mic - the Elecraft Proset-K2 is still available from Elecraft.
I really don't know what happened with the MH2 and MD2 mics - they were good
although I do recall a few complaints about the MH2 which was the handheld
mic (in an impact resistant hard plastic case) - the desk mic (MD2) is a
very nice metal body microphone.  I have both here.  If you can find someone
selling the MH2 or the MD2, you may want to check it out (I am not giving up
mine!).

73,
Don W3FPR

> -Original Message-
>
> Never did get a clear answer on this.  If I wire the K2 up for the
> Kenwood, and I have a Heil Pro Headset with the Kenwood adapter, I will
> be good to go?
>
> Curious, why did they stop making the Elecraft associated mike?  Was it
> plastic or metal?
>
> David Wilburn
> [EMAIL PROTECTED]
>
>
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Re: [Elecraft] Microphone preamp and Heils

2007-02-16 Thread David Wilburn
Never did get a clear answer on this.  If I wire the K2 up for the 
Kenwood, and I have a Heil Pro Headset with the Kenwood adapter, I will 
be good to go?


Curious, why did they stop making the Elecraft associated mike?  Was it 
plastic or metal?


David Wilburn
[EMAIL PROTECTED]



David Wilburn wrote:
Just curious of why the focus on the ICOM mikes?  When I looked at the 
drawing for the pins on the front panel, it looked like the Kenwood was 
the least complicated to wire.


A bit off topic, the Heil website does not show the hand mikes anymore. 
 Well not a 'real' hand mike that sits and your hand as something 
rugged.  They have these little microphone mikes.  Not something that 
I'm interested in connecting to any of my radios.  If I want a hands 
free setup, I'll use a headset and boom.  Bar that, if I want to talk on 
a mike and listen via the speaker, I want a substantial mike that feels 
like I have something in my hand.


My current plan is to wire my K2 up for the Kenwood microphone.  My 
other radio is a TS-570.  The assumption on my part, is that I will then 
be able to use my Heil headset on both the Kenwood and the K2.  Is this 
a valid assumption?


David Wilburn
[EMAIL PROTECTED]



Don Wilhelm wrote:
The Heil microphone preamps are required for the Heil microphones 
using the
HC4 and HC5 elements.  The electret elements do not need a preamp (but 
they
do need a resistor at the mic jack).  The Heil mics designated for use 
with
Icom transceivers are usually of the electret typw and work quite well 
with

the K2.

Remember that Heil has a wide variety of mics, just saying that you are
using a Heil mic is not sufficient information, one must specify WHICH 
Heil
mics - they are not created equal.  I guess an anology is that you 
would not
refer to an automobile as a General Motors car - you must specify if 
it is a

Chevrolet, a Buick, a Cadillac, etc., and in many cases one must also
specify which variety of Chevrolet, Buick, etc.  Heil mics are much like
that.

So, yes choose the Icom mics if possible, but if you prefer those with 
the
HC4 or HC5 elements (those elemetns have low ouput), you should plan 
to add
a mic preamp.  As far as I know, no PC boards or kits are available 
for the

mic preamps.

73,
Don W3FPR


-Original Message-

Hi, sorry if this repeats previous information request, but I did
a lot of
searching and didn't find anything directly on point (even though
there were
several threads on preamps and Heils, etc.)


I downloaded the Microphone Pre-Amp for Heil  schematic on the Elecraft
website.

My questions are:
1.  Does anybody make a PCB for this  project?  I imagine all
these parts are
available from Radio Shack  or Mouser?

2.  Does the preamp make the microphones  work really well, or is it 
just

something that "gets you  by?"

3.  As far as Heil microphone modules go,  if I build the preamp,
and want to
buy the Classic, can I use any module, like  the Pro, HC-5, HC-4,
etc., or
should I get the ICOM only module, which I believe  is an
electret module.  I am
a bit confused about all this.  I asked  Elecraft and they said I
should get
the electret module.  Bob Heil said the  Classic was not a good
choice for the
K2 and he suggested his iCM mic for  ICOM.  Doesn't the iCM mic
have the same
electret element  that the Classic with the  IC element has?  If
all I needed
was  an electret element, do I need the preamp at all, or does it
make the
electret  work even better?

4.  Once I build the preamp, is it  something that I can tuck into the
microphone itself (like a Heil Classic) or  does it go inside the
K2 or do I need to
put it into it's own little  enclosure.

Thanks for your help.  I am a new ham, and  am trying to sort through 
all

this stuff.
Christ Kacoyannakis
K4CMK



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RE: [Elecraft] Microphone preamp and Heils

2007-02-15 Thread Bernie Gardner
One quick note on the Heil Handi Mic.  You can order it with any of 
the standard Heil elements.  It doesn't have a permanently attached 
cord.  You can order a variety of cords for different radios.   So I 
ordered the Icom element with the Kenwood cord.  Adding the resistor 
to the Kenwood style connector worked fine without having to change 
the Elecraft header.  The Handi Mic is a little smaller than the 
regular mike, but it still seems like a substantial unit and works 
great.  I wanted to take it 'on the road' and the compact size is an advantage.


Bernie
W1AZ

At 10:17 AM 2/15/2007, Don Wilhelm wrote:

Dave,

The stock K2 works best with a high output mic.  The previously available
Elecraft MH2 and MD2 were high output electret mics (the ProSet-K2 was
also).  Unfortunately, the MH2 and MD2 are not currently available.  The
folks at Elecraft are trying to find suitable replacements, but so far no
announcements about that.

In the absence of actual Elecraft microphones, the Icom mics are the ones
that use the electret type element, and a line of those mics is available
from Heil - unfortunately, the Heil "iC" microphones have the Icom pinout,
so the easiest route is to just use the mic as-is and set the K2 mic
configuration header for Icom.

For those who want an electret mic at a more economical price, take a look
at the Ten Tec 701 mic priced at $28.  It comes with a 4 pin plug that must
be changed to an 8 pin, but the advantage is that you can wire it for the
Elecraft mic pinout, so that when Elecraft finds a good supplier for their
own line of mics, users can just plug in the new mics.

73,
Don W3FPR

> -Original Message-
>
> Just curious of why the focus on the ICOM mikes?  When I looked at the
> drawing for the pins on the front panel, it looked like the Kenwood was
> the least complicated to wire.
>
> A bit off topic, the Heil website does not show the hand mikes anymore.
>   Well not a 'real' hand mike that sits and your hand as something
> rugged.  They have these little microphone mikes.  Not something that
> I'm interested in connecting to any of my radios.  If I want a hands
> free setup, I'll use a headset and boom.  Bar that, if I want to talk on
> a mike and listen via the speaker, I want a substantial mike that feels
> like I have something in my hand.
>
> My current plan is to wire my K2 up for the Kenwood microphone.  My
> other radio is a TS-570.  The assumption on my part, is that I will then
> be able to use my Heil headset on both the Kenwood and the K2.  Is this
> a valid assumption?
>
> David Wilburn
> [EMAIL PROTECTED]
>
>
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RE: [Elecraft] Microphone preamp and Heils

2007-02-15 Thread Jim Brown
On Thu, 15 Feb 2007 10:17:57 -0500, Don Wilhelm wrote:

>The stock K2 works best with a high output mic. 

Yes. But that's really a nice way of saying that the audio 
circuitry of the K2 lacks sufficient gain to work well with a real 
mic. There are several mods to improve this situation, and all 
that I've seen posted look pretty solid. 

One simple mod that I've done to my K2's increases the gain by 6 
dB and raises the low-cut filter to about 250 Hz. The importance 
of the low cut change is that the lows don't contribute to 
communications, but they do suck power, and they also cause the 
compressor to reduce the mic gain. 

That mod is:

Change R14 to 2K.  Change C34 to 0.22 uF.  Add 2.2 uF in series 
with R15. 

If you have a source for good audio transformers, you can get 
another 6 dB by adding a step-up transformer with a turns ratio of 
about 1:3. I found a vintage UTC Ouncer in my junk box that did 
the job. It's wired with an XLR on one end (that plugs into my EV 
RE11) and the Elecraft connector on the other. 

The radio mods will work for any decent mic. The transformer will 
only work with dynamic mics. It won't work with electret mics 
(because they need a bit of current from the radio to run the 
capsule and it's FET output stage).  

73,

Jim Brown K9YC



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RE: [Elecraft] Microphone preamp and Heils

2007-02-15 Thread Don Wilhelm
Dave,

The stock K2 works best with a high output mic.  The previously available
Elecraft MH2 and MD2 were high output electret mics (the ProSet-K2 was
also).  Unfortunately, the MH2 and MD2 are not currently available.  The
folks at Elecraft are trying to find suitable replacements, but so far no
announcements about that.

In the absence of actual Elecraft microphones, the Icom mics are the ones
that use the electret type element, and a line of those mics is available
from Heil - unfortunately, the Heil "iC" microphones have the Icom pinout,
so the easiest route is to just use the mic as-is and set the K2 mic
configuration header for Icom.

For those who want an electret mic at a more economical price, take a look
at the Ten Tec 701 mic priced at $28.  It comes with a 4 pin plug that must
be changed to an 8 pin, but the advantage is that you can wire it for the
Elecraft mic pinout, so that when Elecraft finds a good supplier for their
own line of mics, users can just plug in the new mics.

73,
Don W3FPR

> -Original Message-
>
> Just curious of why the focus on the ICOM mikes?  When I looked at the
> drawing for the pins on the front panel, it looked like the Kenwood was
> the least complicated to wire.
>
> A bit off topic, the Heil website does not show the hand mikes anymore.
>   Well not a 'real' hand mike that sits and your hand as something
> rugged.  They have these little microphone mikes.  Not something that
> I'm interested in connecting to any of my radios.  If I want a hands
> free setup, I'll use a headset and boom.  Bar that, if I want to talk on
> a mike and listen via the speaker, I want a substantial mike that feels
> like I have something in my hand.
>
> My current plan is to wire my K2 up for the Kenwood microphone.  My
> other radio is a TS-570.  The assumption on my part, is that I will then
> be able to use my Heil headset on both the Kenwood and the K2.  Is this
> a valid assumption?
>
> David Wilburn
> [EMAIL PROTECTED]
>
>
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Re: [Elecraft] Microphone preamp and Heils

2007-02-15 Thread David Wilburn
Just curious of why the focus on the ICOM mikes?  When I looked at the 
drawing for the pins on the front panel, it looked like the Kenwood was 
the least complicated to wire.


A bit off topic, the Heil website does not show the hand mikes anymore. 
 Well not a 'real' hand mike that sits and your hand as something 
rugged.  They have these little microphone mikes.  Not something that 
I'm interested in connecting to any of my radios.  If I want a hands 
free setup, I'll use a headset and boom.  Bar that, if I want to talk on 
a mike and listen via the speaker, I want a substantial mike that feels 
like I have something in my hand.


My current plan is to wire my K2 up for the Kenwood microphone.  My 
other radio is a TS-570.  The assumption on my part, is that I will then 
be able to use my Heil headset on both the Kenwood and the K2.  Is this 
a valid assumption?


David Wilburn
[EMAIL PROTECTED]



Don Wilhelm wrote:

The Heil microphone preamps are required for the Heil microphones using the
HC4 and HC5 elements.  The electret elements do not need a preamp (but they
do need a resistor at the mic jack).  The Heil mics designated for use with
Icom transceivers are usually of the electret typw and work quite well with
the K2.

Remember that Heil has a wide variety of mics, just saying that you are
using a Heil mic is not sufficient information, one must specify WHICH Heil
mics - they are not created equal.  I guess an anology is that you would not
refer to an automobile as a General Motors car - you must specify if it is a
Chevrolet, a Buick, a Cadillac, etc., and in many cases one must also
specify which variety of Chevrolet, Buick, etc.  Heil mics are much like
that.

So, yes choose the Icom mics if possible, but if you prefer those with the
HC4 or HC5 elements (those elemetns have low ouput), you should plan to add
a mic preamp.  As far as I know, no PC boards or kits are available for the
mic preamps.

73,
Don W3FPR


-Original Message-

Hi, sorry if this repeats previous information request, but I did
a lot of
searching and didn't find anything directly on point (even though
there were
several threads on preamps and Heils, etc.)


I downloaded the Microphone Pre-Amp for Heil  schematic on the Elecraft
website.

My questions are:
1.  Does anybody make a PCB for this  project?  I imagine all
these parts are
available from Radio Shack  or Mouser?

2.  Does the preamp make the microphones  work really well, or is it just
something that "gets you  by?"

3.  As far as Heil microphone modules go,  if I build the preamp,
and want to
buy the Classic, can I use any module, like  the Pro, HC-5, HC-4,
etc., or
should I get the ICOM only module, which I believe  is an
electret module.  I am
a bit confused about all this.  I asked  Elecraft and they said I
should get
the electret module.  Bob Heil said the  Classic was not a good
choice for the
K2 and he suggested his iCM mic for  ICOM.  Doesn't the iCM mic
have the same
electret element  that the Classic with the  IC element has?  If
all I needed
was  an electret element, do I need the preamp at all, or does it
make the
electret  work even better?

4.  Once I build the preamp, is it  something that I can tuck into the
microphone itself (like a Heil Classic) or  does it go inside the
K2 or do I need to
put it into it's own little  enclosure.

Thanks for your help.  I am a new ham, and  am trying to sort through all
this stuff.
Christ Kacoyannakis
K4CMK



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Re: [Elecraft] Microphone preamp and Heils

2007-02-14 Thread Geoffrey Mackenzie-Kennedy

Don, W3FPR wrote:


Remember that Heil has a wide variety of mics, just saying that you are
using a Heil mic is not sufficient information, one must specify WHICH 
Heil

mics - they are not created equal.


-

Absolutely, and it would appear that mics using the HC4 and HC5 elements are 
not created equal either. I use a Heil Proset Plus headset with boom mic 
which uses the HC4 and HC5, and have no difficulty in obtaining full rated 
output on all bands from an unmodified K2/100  #3255 without using a 
preamplifier. A preamp would be required if the mic were to be at a greater 
distance from my mouth e.g. a desk mic. BTW 'Headquarters' reports that I 
have a quiet voice.


73,
Geoff
GM4ESD





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RE: [Elecraft] Microphone preamp and Heils

2007-02-14 Thread Don Wilhelm
The Heil microphone preamps are required for the Heil microphones using the
HC4 and HC5 elements.  The electret elements do not need a preamp (but they
do need a resistor at the mic jack).  The Heil mics designated for use with
Icom transceivers are usually of the electret typw and work quite well with
the K2.

Remember that Heil has a wide variety of mics, just saying that you are
using a Heil mic is not sufficient information, one must specify WHICH Heil
mics - they are not created equal.  I guess an anology is that you would not
refer to an automobile as a General Motors car - you must specify if it is a
Chevrolet, a Buick, a Cadillac, etc., and in many cases one must also
specify which variety of Chevrolet, Buick, etc.  Heil mics are much like
that.

So, yes choose the Icom mics if possible, but if you prefer those with the
HC4 or HC5 elements (those elemetns have low ouput), you should plan to add
a mic preamp.  As far as I know, no PC boards or kits are available for the
mic preamps.

73,
Don W3FPR

> -Original Message-
>
> Hi, sorry if this repeats previous information request, but I did
> a lot of
> searching and didn't find anything directly on point (even though
> there were
> several threads on preamps and Heils, etc.)
>
>
> I downloaded the Microphone Pre-Amp for Heil  schematic on the Elecraft
> website.
>
> My questions are:
> 1.  Does anybody make a PCB for this  project?  I imagine all
> these parts are
> available from Radio Shack  or Mouser?
>
> 2.  Does the preamp make the microphones  work really well, or is it just
> something that "gets you  by?"
>
> 3.  As far as Heil microphone modules go,  if I build the preamp,
> and want to
> buy the Classic, can I use any module, like  the Pro, HC-5, HC-4,
> etc., or
> should I get the ICOM only module, which I believe  is an
> electret module.  I am
> a bit confused about all this.  I asked  Elecraft and they said I
> should get
> the electret module.  Bob Heil said the  Classic was not a good
> choice for the
> K2 and he suggested his iCM mic for  ICOM.  Doesn't the iCM mic
> have the same
> electret element  that the Classic with the  IC element has?  If
> all I needed
> was  an electret element, do I need the preamp at all, or does it
> make the
> electret  work even better?
>
> 4.  Once I build the preamp, is it  something that I can tuck into the
> microphone itself (like a Heil Classic) or  does it go inside the
> K2 or do I need to
> put it into it's own little  enclosure.
>
> Thanks for your help.  I am a new ham, and  am trying to sort through all
> this stuff.
> Christ Kacoyannakis
> K4CMK
>
>
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Re: [Elecraft] Microphone preamp and Heils

2007-02-14 Thread Bernie Gardner

I recently bought a Heil 'Handi-MIc' with the Icom element (designated
HM-IC).  It works fine without a preamp, but does need the resistor to
bias the electret element.  Rather than removing the front panel and
wiring the jumper, I just opened up the connector shell on the mic and
soldered the resistor between the appropriate pins on the connector.
(I'm away from home at the moment and don't have the diagram to tell
you which pins, but it's pretty easy to figure out.)  The microphone
seems to work very well.  I assume this would work with other Heil mics
with the Icom element.

Bernie
W1AZ


At 09:51 PM 2/14/2007, [EMAIL PROTECTED] wrote:

Hi, sorry if this repeats previous information request, but I did a lot of
searching and didn't find anything directly on point (even though there were
several threads on preamps and Heils, etc.)


I downloaded the Microphone Pre-Amp for Heil  schematic on the Elecraft
website.

My questions are:
1.  Does anybody make a PCB for this  project?  I imagine all these parts are
available from Radio Shack  or Mouser?

2.  Does the preamp make the microphones  work really well, or is it just
something that "gets you  by?"

3.  As far as Heil microphone modules go,  if I build the preamp, and want to
buy the Classic, can I use any module, like  the Pro, HC-5, HC-4, etc., or
should I get the ICOM only module, which I believe  is an electret 
module.  I am

a bit confused about all this.  I asked  Elecraft and they said I should get
the electret module.  Bob Heil said the  Classic was not a good 
choice for the

K2 and he suggested his iCM mic for  ICOM.  Doesn't the iCM mic have the same
electret element  that the Classic with the  IC element has?  If all I needed
was  an electret element, do I need the preamp at all, or does it make the
electret  work even better?

4.  Once I build the preamp, is it  something that I can tuck into the
microphone itself (like a Heil Classic) or  does it go inside the K2 
or do I need to

put it into it's own little  enclosure.

Thanks for your help.  I am a new ham, and  am trying to sort through all
this stuff.
Christ Kacoyannakis
K4CMK

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