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Dana
Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA
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 Posted: Wed Feb 22, 2017 3:47 pm Post subject: headset matching to radio |
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I could use some help on headset and microphone wiring.
I just purchased a Starduster One, which is currently 1000 miles from my home. I plan to fly it home in a month or so. Before I do that, I need to get the communications worked out.
The plane has a King KY97A radio installed, with the typical 1/4 and 3/16" jacks for a headset. The owner's headset works fine, but he's keeping it and I don't own one (or not a standard one).
In my current plane, I've been using an Icom A24 with a homemade headset consisting of consumer stereo earbuds and an electret microphone salvaged from an old computer headset. This works just fine. I have also used a Comtronics helmet with the Icom radio, and it worked fine as well (aside from the Icom transmit squeal, which is a separate issue that I solved).
Anyway, my question is, will the homemade setup, which works with the Icom, work with the King or will I need some additional matching electronics? The Icom specs say 100kohm mic, 8ohm earphones, whereas the King installation manual says "Standard carbon or dynamic mic containing transistor-ized preamp. Must provide 100 mVrms into 100 ohm load," and receiver output "100 mW minimum into 500 ohms or 4 W into 4 ohms". I presume the 4 ohm is for a cabin mounted speaker and the 500 ohm is for a headset, which means I'd need an impedance matching transformer for the earbuds? As for the microphone, if it's looking for a dynamic mike with a preamp, it should work with an electret as is?
The problem is with the airplane 1000 miles away, I have to prep everything here at home, and it needs to "just work" when I pick the plane up as I won't have much time to fool around with it before departing.
Thanks for any help.
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Eric Page
Joined: 15 Feb 2017
Posts: 247
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| Posted: Wed Feb 22, 2017 4:57 pm Post subject: headset matching to radio |
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This isn't an answer to your question, but...
Do your hearing a favor and get a proper noise-attenuating aviation headset. There are inexpensive options available if that's the issue, but *any* headset is $hundreds$ cheaper than your first set of hearing aids when you suffer hearing loss from noise exposure. This is especially critical in an open cockpit.
If you like in-ear headsets, I can heartily recommend Clarity Aloft:
https://www.clarityaloft.com/
I've been using one in commercial flying for years and I love it. It's quieter than my old David-Clark H10-80 that was upgraded with an ANR kit, and I can wear it for hours with no discomfort.
Another very similar but cheaper option is the Quiet Technologies Halo:
http://www.quiettechnologies.com/
Eric
On Feb 22, 2017, at 3:47 PM, Dana <d-m-hague(at)comcast.net (d-m-hague(at)comcast.net)> wrote:
| Quote: | I could use some help on headset and microphone wiring.
I just purchased a Starduster One, which is currently 1000 miles from my home. I plan to fly it home in a month or so. Before I do that, I need to get the communications worked out.
The plane has a King KY97A radio installed, with the typical 1/4 and 3/16" jacks for a headset. The owner's headset works fine, but he's keeping it and I don't own one (or not a standard one).
In my current plane, I've been using an Icom A24 with a homemade headset consisting of consumer stereo earbuds and an electret microphone salvaged from an old computer headset. This works just fine. I have also used a Comtronics helmet with the Icom radio, and it worked fine as well (aside from the Icom transmit squeal, which is a separate issue that I solved).
Anyway, my question is, will the homemade setup, which works with the Icom, work with the King or will I need some additional matching electronics? The Icom specs say 100kohm mic, 8ohm earphones, whereas the King installation manual says "Standard carbon or dynamic mic containing transistor-ized preamp. Must provide 100 mVrms into 100 ohm load," and receiver output "100 mW minimum into 500 ohms or 4 W into 4 ohms". I presume the 4 ohm is for a cabin mounted speaker and the 500 ohm is for a headset, which means I'd need an impedance matching transformer for the earbuds? As for the microphone, if it's looking for a dynamic mike with a preamp, it should work with an electret as is?
The problem is with the airplane 1000 miles away, I have to prep everything here at home, and it needs to "just work" when I pick the plane up as I won't have much time to fool around with it before departing.
Thanks for any help.
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Dana
Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA
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| Posted: Wed Feb 22, 2017 5:14 pm Post subject: Re: headset matching to radio |
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I should have been more clear; I'm using noise canceling earbuds, not ordinary ones.
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nuckolls.bob(at)aeroelect
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| Posted: Wed Feb 22, 2017 5:47 pm Post subject: headset matching to radio |
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At 05:47 PM 2/22/2017, you wrote:
| Quote: | --> AeroElectric-List message posted by: "Dana" <d-m-hague(at)comcast.net>
I could use some help on headset and microphone wiring.
I just purchased a Starduster One, which is currently 1000 miles from my home. I plan to fly it home in a month or so. Before I do that, I need to get the communications worked out.
The plane has a King KY97A radio installed, with the typical 1/4 and 3/16" jacks for a headset. The owner's headset works fine, but he's keeping it and I don't own one (or not a standard one).
In my current plane, I've been using an Icom A24 with a homemade headset consisting of consumer stereo earbuds and an electret microphone salvaged from an old computer headset. This works just fine. I have also used a Comtronics helmet with the Icom radio, and it worked fine as well (aside from the Icom transmit squeal, which is a separate issue that I solved).
Anyway, my question is, will the homemade setup, which works with the Icom, work with the King or will I need some additional matching electronics? The Icom specs say 100kohm mic, 8ohm earphones, whereas the King installation manual says "Standard carbon or dynamic mic containing transistor-ized preamp. Must provide 100 mVrms into 100 ohm load," and receiver output "100 mW minimum into 500 ohms or 4 W into 4 ohms". I presume the 4 ohm is for a cabin mounted speaker and the 500 ohm is for a headset, which means I'd need an impedance matching transformer for the earbuds? As for the microphone, if it's looking for a dynamic mike with a preamp, it should work with an electret as is?
The problem is with the airplane 1000 miles away, I have to prep everything here at home, and it needs to "just work" when I pick the plane up as I won't have much time to fool around with it before departing. |
Your DIY audio rig is not legacy compatible for
aircraft. Virtually ALL off-the-shelf mic/headsets
for aircraft are electret elements fitted with
the amplifier described. Suggest you borrow a
legacy headset to get the airplane home where
your efforts to adapt the DIY system will are
easier to accomplish.
Bob . . .
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Dana
Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA
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| Posted: Wed Feb 22, 2017 6:08 pm Post subject: Re: headset matching to radio |
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| nuckolls.bob(at)aeroelect wrote: |
Your DIY audio rig is not legacy compatible for
aircraft. Virtually ALL off-the-shelf mic/headsets
for aircraft are electret elements fitted with
the amplifier described. Suggest you borrow a
legacy headset to get the airplane home where
your efforts to adapt the DIY system will are
easier to accomplish. |
That's probably what I'll do, unless I can get something together and tested here. I have a month or two.
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ceengland7(at)gmail.com
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| Posted: Wed Feb 22, 2017 7:01 pm Post subject: headset matching to radio |
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On 2/22/2017 8:08 PM, Dana wrote:
| Quote: |
nuckolls.bob(at)aeroelect wrote:
> Your DIY audio rig is not legacy compatible for
> aircraft. Virtually ALL off-the-shelf mic/headsets
> for aircraft are electret elements fitted with
> the amplifier described. Suggest you borrow a
> legacy headset to get the airplane home where
> your efforts to adapt the DIY system will are
> easier to accomplish.
That's probably what I'll do, unless I can get something together and tested here. I have a month or two.
Just plug your rig into an airport neighbor's plane with the same or
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similar age radio. You'll know fairly quickly if it's compatible or not.
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Dana
Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA
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| Posted: Tue Mar 28, 2017 6:23 pm Post subject: Re: headset matching to radio |
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I haven't picked up the plane yet, but I have a system I'm confident will work. On one side, an impedance matching transformer to convert the 8 ohm earphones for a receiver output expecting 300 ohms, and for the mike side, rather than working out an amplifier I bought a new replacement noise cancelling mike element from Aircraft Spruce. Wired to the appropriate connectors, I've verified they work, at least with the radio in a friend's Bonanza. Interestingly, they also work with the Icom handheld in my old plane... I guess the Icom is a lot more tolerant than the older radios.
As for the "why", I use the earbuds because they fit under a leather flying helmet. The mike is on a flexible boom that clips to my shoulder harness, much more comfortable than than being clamped around my head or over my ears.
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