My brother is a helicopter pilot in the military. He gave me a D&C
H10-76XL headset. I understand that there is an impedance issue with
using a military headset in GA. So, I began looking for an impedance
adapter. In doing so, I found what I thought I needed. But, after
doing a little more checking, I'm finding that the H10-76 and H10-76XL,
specifically, are said not to work with the impedance adapter. In stead,
some sites recommend simply getting a heli->GA plug and replace the
dynamic mic with an electret mic. I've done some googling and find
conflicting reports, so it's hard to know for sure exactly what I need.
In some old posts, some people say that the adapter will work while others
say they won't; following up with supporting statements that the mic does
have to be replaced.

Any so, now my questions. Does this mean that my headset is actually a
high impedance headset? If not, why don't I need an impedance adapter?
Why would I need to replace the mic? Can I simply get away with using the
dynamic mic? If not, what's involved with replacing a mic on this
headset? Soldering required, or can I simply unplug the old mic and plug
in the new one? If I send it into D&C, what would it cost to have them do
the conversion? Estimates?

Thanks in advance!

Best Regards & Happy New Year,

Greg

all you need to do is get the conversion plug for the U-78 cord to a general
aviation cord, and then get an electret mic and install it. I did it on
mine, and it works great. I got the cord from www.Sportys.com and the mic's
from www.pilotmall.com I believe...Good luck.

"Greg Copeland" > wrote in message
...
> My brother is a helicopter pilot in the military. He gave me a D&C
> H10-76XL headset. I understand that there is an impedance issue with
> using a military headset in GA. So, I began looking for an impedance
> adapter. In doing so, I found what I thought I needed. But, after
> doing a little more checking, I'm finding that the H10-76 and H10-76XL,
> specifically, are said not to work with the impedance adapter. In stead,
> some sites recommend simply getting a heli->GA plug and replace the
> dynamic mic with an electret mic. I've done some googling and find
> conflicting reports, so it's hard to know for sure exactly what I need.
> In some old posts, some people say that the adapter will work while others
> say they won't; following up with supporting statements that the mic does
> have to be replaced.
>
> Any so, now my questions. Does this mean that my headset is actually a
> high impedance headset? If not, why don't I need an impedance adapter?
> Why would I need to replace the mic? Can I simply get away with using the
> dynamic mic? If not, what's involved with replacing a mic on this
> headset? Soldering required, or can I simply unplug the old mic and plug
> in the new one? If I send it into D&C, what would it cost to have them do
> the conversion? Estimates?
>
> Thanks in advance!
>
> Best Regards & Happy New Year,
>
> Greg
>

Also, there is no need to solder...just a jewler's screwdriver to loosen
the tiny screws in the mic. I also had to bore out the holes on the new
electret mic's to fit the bushing on the David Clark mic boom. Be careful if
you are using a hand drill, as it's really easy to crack the mic assy...As
far as the impedence issue, I really don't know, but I have flown with it
for about 5 hours now in a Cessna 172 and I have not noticed any problems so
far.

On Tue, 04 Jan 2005 20:45:51 -0600, SSG B wrote:

> all you need to do is get the conversion plug for the U-78 cord to a general
> aviation cord, and then get an electret mic and install it. I did it on
> mine, and it works great. I got the cord from www.Sportys.com and the mic's
> from www.pilotmall.com I believe...Good luck.

First, let me say thanks for replying!

By any chance, did you look at using this? This is what D&C came back and
recommended.
http://www.davidclark.com/Store/ProductDetails.aspx?productID=41

But you're saying that you used something like this:
http://www.mypilotstore.com/mypilotstore/sep/1251
with a mic like this:
http://www.mypilotstore.com/mypilotstore/sep/2162

If I did it my self, it looks like it will cost ~$82.00 + shipping. If I
order directly from D&C, it will cost ~$130.00. Hmmm...

I'm thinking the new mic sounds pretty good! That about what you paid?

Thanks again,

Greg

That's what I did.

I did pay around $80.00 to convert it.