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tacaruth(at)dybb.com
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 Posted: Thu Jan 25, 2007 10:58 am Post subject: Homemade Audio Panel |
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Hi All,
I have an experimental aircraft I built. It currently has one comm radio. I am
interested in adding a second comm radio. To do this, one must be able to
switch between the radios. The common method for this is to install in audio
panel of which there are many versions on the market. The problem with these
solutions is that they have lots of switches such as nav radios, dme, adf, etc.
Does anyone know if a unit that only has switches for 2 comm radios? The
closest I can find is the PMA-4000 which also includes an intercom and 2 nav
inputs. I already have an intercom which handles my needs fine. I was
thinking of adding a 2 position, 3 circuit switch for radio selection. The 3
circuits would be for audio, mic, and ptt. If I wanted to expand this system,
I could add a pair of 2 position, 1 circuit switches to allow the radio that is
not selected with the first 3 circuit switch.
Any thoughts/comments would be appreciated.
Thanks, Tom
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fvalarm(at)rapidnet.net
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| Posted: Thu Jan 25, 2007 3:58 pm Post subject: Homemade Audio Panel |
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Tom, I don't know of one with only switches for 2 radios (although there
probably is one), but there's lots of basic audio panels on ebay. The basic
ones go pretty cheap. The following example is one that a do-it-youselfer
could start with and repaint/label the front panel for a low cost audio
panel. See
http://cgi.ebay.com/ebaymotors/BENDIX-KING-KMA-24-Audio-Panel_W0QQitemZ11008
4059554QQihZ001QQcategoryZ90973QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
Bevan
RV7A just bought a used PS engineering audio panel
--
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N6030X(at)DaveMorris.com
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| Posted: Thu Jan 25, 2007 4:43 pm Post subject: Homemade Audio Panel |
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Tom, on my 1960 Mooney they didn't have audio panels back then, so
they just wired the outputs of the 2 COM radios together and
installed a switch with a relay to control the mic/PTT inputs. I
then have an intercom with VOX and a music input to allow me to talk
to the copilot and listen to the iPod. When I want to listen to a
radio, I turn up its volume. If I want to listen to both radios, I
turn up both, realizing them with both switched on, the output volume
suffers somewhat. When I transmit on one, I turn the volume down on
the other so as not to hear the squeal. It's not the best way, but
it's definitely the cheapest way.
The next cheapest is probably the RST Engineering audio panel kit
http://www.rst-engr.com/rst/catalog/audio_panel.html
Dave Morris
www.N6030X.com
At 11:57 AM 1/25/2007, you wrote:
| Quote: |
Hi All,
I have an experimental aircraft I built. It currently has one comm
radio. I am
interested in adding a second comm radio. To do this, one must be able to
switch between the radios. The common method for this is to install in audio
panel of which there are many versions on the market. The problem with these
solutions is that they have lots of switches such as nav radios,
dme, adf, etc.
Does anyone know if a unit that only has switches for 2 comm radios? The
closest I can find is the PMA-4000 which also includes an intercom and 2 nav
inputs. I already have an intercom which handles my needs fine. I was
thinking of adding a 2 position, 3 circuit switch for radio selection. The 3
circuits would be for audio, mic, and ptt. If I wanted to expand this system,
I could add a pair of 2 position, 1 circuit switches to allow the
radio that is
not selected with the first 3 circuit switch.
Any thoughts/comments would be appreciated.
Thanks, Tom
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john(at)ballofshame.com
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| Posted: Thu Jan 25, 2007 5:25 pm Post subject: Homemade Audio Panel |
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If all you want to do is physically switch between radios, a switch should
work fine.
If you want to be able to mix and match (talk on one, transmit on the
other....talk/listen on one and just listen on the other) this is easily
doable with a few bucks worth of parts from Radio Shack. All you need to
do is send the audio out from the radios into isolation amplifiers
(nothing special about the amps....it's all in how you use them). I'm
sure you can find a schematic on the web somewhere and it shouldn't take
more than a weekend to assemble, test and package. The isolation amps
allow you to have multiple inputs without screwing up the impedence of the
load the radios see. If you try and just wire everything together, you'll
get funny sounding audio (low power, distorsion etc). Depending on the
radio and your tolerance it may or may not be OK.
| Quote: | From there, you can get fancier and add switches to select which audio to
listen to (instead of turning them up and down from the volume knob).
|
If I did this, I would setup each input with a 2 position switch - On or
Auto. Then a switch for mic/ptt (com1, com2). In "On", the channel is
always on. In Auto, it's on if the mic has selected that channel, else
it's off. 99% of the time, everthing will be auto. Every now and then,
you'll transmit on one channel and recieve on another so you'll have to
force the recieve channel to "On".
This really would make a nice weekend project. Maybe 2 weekends and a
couple of weeknights (and some help from a EE buddy) if it's your first
circuit project.
-John
[quote]
Tom, I don't know of one with only switches for 2 radios (although there
probably is one), but there's lots of basic audio panels on ebay. The
basic
ones go pretty cheap. The following example is one that a do-it-youselfer
could start with and repaint/label the front panel for a low cost audio
panel. See
http://cgi.ebay.com/ebaymotors/BENDIX-KING-KMA-24-Audio-Panel_W0QQitemZ11008
4059554QQihZ001QQcategoryZ90973QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
Bevan
RV7A just bought a used PS engineering audio panel
--
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nuckollsr(at)cox.net
Guest
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| Posted: Fri Jan 26, 2007 4:48 am Post subject: Homemade Audio Panel |
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At 12:57 PM 1/25/2007 -0600, you wrote:
| Quote: |
Hi All,
I have an experimental aircraft I built. It currently has one comm
radio. I am
interested in adding a second comm radio. To do this, one must be able to
switch between the radios. The common method for this is to install in audio
panel of which there are many versions on the market. The problem with these
solutions is that they have lots of switches such as nav radios, dme, adf,
etc.
Does anyone know if a unit that only has switches for 2 comm radios? The
closest I can find is the PMA-4000 which also includes an intercom and 2 nav
inputs. I already have an intercom which handles my needs fine. I was
thinking of adding a 2 position, 3 circuit switch for radio selection. The 3
circuits would be for audio, mic, and ptt. If I wanted to expand this system,
I could add a pair of 2 position, 1 circuit switches to allow the radio
that is
not selected with the first 3 circuit switch.
Any thoughts/comments would be appreciated.
|
Suggest you review . . .
http://aeroelectric.com/articles/Rev11/18Audio_R11.pdf
and stir the concepts discussed into your deliberations
and design plans. Also see . . .
http://www.aeroelectric.com/DIY/Audio_Isolation_Amplifier.pdf
Bob . . .
----------------------------------------
( IF one aspires to be "world class", )
( what ever you do must be exercised )
( EVERY day . . . )
( R. L. Nuckolls III )
----------------------------------------
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john(at)ballofshame.com
Guest
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| Posted: Fri Jan 26, 2007 8:30 am Post subject: Homemade Audio Panel |
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Neat, Bob. Do you happen to have a design for a Marker Beacon receiver
kicking around anywhere?
-John
Robert L. Nuckolls, III wrote:
| Quote: |
<nuckollsr(at)cox.net>
At 12:57 PM 1/25/2007 -0600, you wrote:
>
>
> Hi All,
>
> I have an experimental aircraft I built. It currently has one comm
> radio. I am
> interested in adding a second comm radio. To do this, one must be
> able to
> switch between the radios. The common method for this is to install
> in audio
> panel of which there are many versions on the market. The problem
> with these
> solutions is that they have lots of switches such as nav radios, dme,
> adf, etc.
> Does anyone know if a unit that only has switches for 2 comm
> radios? The
> closest I can find is the PMA-4000 which also includes an intercom
> and 2 nav
> inputs. I already have an intercom which handles my needs fine. I was
> thinking of adding a 2 position, 3 circuit switch for radio
> selection. The 3
> circuits would be for audio, mic, and ptt. If I wanted to expand
> this system,
> I could add a pair of 2 position, 1 circuit switches to allow the
> radio that is
> not selected with the first 3 circuit switch.
>
> Any thoughts/comments would be appreciated.
Suggest you review . . .
http://aeroelectric.com/articles/Rev11/18Audio_R11.pdf
and stir the concepts discussed into your deliberations
and design plans. Also see . . .
http://www.aeroelectric.com/DIY/Audio_Isolation_Amplifier.pdf
Bob . . .
----------------------------------------
( IF one aspires to be "world class", )
( what ever you do must be exercised )
( EVERY day . . . )
( R. L. Nuckolls III )
----------------------------------------
|
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rshannon(at)cruzcom.com
Guest
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| Posted: Fri Jan 26, 2007 9:02 am Post subject: Homemade Audio Panel |
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For a marker beacon receiver kit, see http://rstengineering.com
Ron
John Coloccia wrote:
| Quote: |
<john(at)ballofshame.com>
Neat, Bob. Do you happen to have a design for a Marker Beacon receiver
kicking around anywhere?
-John
|
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DanFM01(at)butter.toast.n
Guest
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| Posted: Fri Jan 26, 2007 9:20 am Post subject: Homemade Audio Panel |
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| Quote: | >When I transmit on one, I turn the volume down on the other so as not to
>hear the squeal. It's not the best way, but it's definitely the cheapest
>way.
|
I believe most com radios have a suppressor line output. They can be wired
so that when one is transmitting the other's receiver is turned off.
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lehmans(at)sympatico.ca
Guest
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| Posted: Sat Jan 27, 2007 9:51 am Post subject: Homemade Audio Panel |
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Tom wrote:
"I have an experimental aircraft I built. It currently has one comm radio.
I am
interested in adding a second comm radio. To do this, one must be able to
switch between the radios. The common method for this is to install in
audio
panel of which there are many versions on the market. The problem with
these
solutions is that they have lots of switches such as nav radios, dme, adf,
etc.
Does anyone know if a unit that only has switches for 2 comm radios?
<...>
Any thoughts/comments would be appreciated."
Tom,
My solution was simply a 4 pole, double throw toggle switch. The 'phones
out' from the not-selected radio is switched into an auxiliary audio input
of the selected com. This allows monitoring of a 2nd frequency regardless
of whether com 1 or 2 is selected. Works fine for me.
Mike
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