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george(at)georgejenson.co
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 Posted: Mon Apr 07, 2008 1:40 pm Post subject: PM3000 Wiring |
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Bob & Listers,
I have a used PM3000 stereo intercom for my RV-7. I am intending to wire
two stereo signals, a Garmin 496 and a 1/8" panel jack, through a 4PDT
switch into the intercom's entertainment input. This input mutes when there
is other activity and allows for pilot isolation. That is the easy part.
The more complicated part is how to handle all the mono signals:
1. Comm1 - Panel mounted, probably a Garmin 480 or a 430w
2. Comm2 - Icom A6 handheld in a panel dock
(I have a 4PDT switch for these two to switch the intercom's transmit output)
3. Nav1 - Garmin 480 or 430w
4. EIS - GRT EIS has audio, and it is the likely candidate.
5. EFIS (?) - Some EFIS's output audio so this is a possibility
6. Garmin 496 Voice Output (?) - Not sure if I need to use this if the
stereo output is attached, though I'd rather have warnings come through an
unmutable (immutable?) input and I'd like to still get 496 audio warnings
if I happen to be listening to an mp3 player.
So that's 4 for sure, 5 likely, and perhaps 6, mono signals for the PM3000,
which has one mono input. Further, the mono input of the PM3000 is supposed
to come after the Aux headset jack. That jack is supposed to be installed
between the Comm radio and the intercom, and from a SHTF perspective, that
makes great sense.
Note that I don't need nor want any of those inputs switched nor do any
need added volume controls. Simple is as simple does, and I'm a simple
(minded) guy.
My current plan is build an audio isolation amp per Bob's plans and route
the output of that into the Aux jack and then into the PM3000.
1. Is this OK or should I put the isolation amp between the Aux jack and
the PM3000 so that the primary comm goes to the Aux jack first, then to the
isolation amp? If the SHTF, I would think that having the Aux jack
immediately after Comm1 might be more betterer, though I would lose all the
other audio. If the audio iso amp is so robust as to be a likely survivor
of most failure modes, then perhaps having the Aux jack on the output side
of it but before the intercom is best. What are your thoughts?
2. If I build the isolation amp per the mono schematics (1.8 an 1.8.1)
there appear to be sufficient inputs and others can even be added (with a
little breading of Bob's circuit board). However they both show only one
input going to pin 3 of U115 and the rest going to pin 2. Does it matter or
should the number of inputs be balanced between those two pins? Or, should
they all go to pin 2 as none of the inputs are a single channel of a stereo
signal? I confess my understanding of how that circuit actually works is
minimal.
3. Is there a chance that this can all be done without the iso amp? I sorta
figured that after about 2 mono signals you pretty well need the iso amp,
but I wanted to confirm that.
Finally Bob, assuming I do need an iso amp, I'd like to order one of your
remaining circuit boards for it. Please advise how I should do so. I was a
teenage ham radio operator and worked in an two-way radio factory during my
youth so I'm very comfortable soldering and building projects.
Thanks in advance,
George Jenson
Tucson, AZ
RV-7 in progress
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rv-9a-online(at)telus.net
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| Posted: Mon Apr 07, 2008 2:26 pm Post subject: PM3000 Wiring |
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George:
I think I can help.
Today, I signed off for proto release on a new aviation audio product called
the AMX-2A Audio Mixer Amplifier.
It takes 10 monophonic audio sources, isolates and amplifies them into one
output. Sort of like Bob's isolation amplifier, but more inputs, mono only
and much smaller package.
Four of the audio inputs have volume controls to allow the adjustment of
audio levels from instruments that have no controls (e.g. Dynon EFIS). The
other six inputs are fixed level, assuming that you have source control of
the audio level from them (e.g. Comms, Traffic Monitors). All inputs are
10K ohm impedance.
The output can be connected into the aux audio input on an intercom. If
your intercom does not support aux inputs (Such as Sigtronics types), the
output can be wired directly into the headphone bus. Both mono and stereo
headphone buses are supported.
All of this is contained in a small package, with a 25-pin D-sub connector
(10 inputs, 2 outputs, power and 12 grounds). In fact, it's so small that
the entire unit mounts in a D-sub backshell.
I don't want to compete with Bob's isolation amplifier (after all it's his
site), but I think he offers it more as a public service than a profit
center. In that spirit, If Bob objects, I will back off.
Documentation is pending, but I can send a pinout pretty quickly.
Thanks, Vern
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Bill Denton
Joined: 10 Jan 2006
Posts: 97
Location: Chicago, IL USA
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| Posted: Mon Apr 07, 2008 2:38 pm Post subject: PM3000 Wiring |
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One thing to consider...
Even though they haven't made much noise about it, about a year ago PS
Engineering added two mono auxiliary inputs to the PM3000. I don't know how
old your unit is, but you might check with PS to see if it has the auxiliary
inputs...
Bill Denton
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sam(at)fr8dog.net
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| Posted: Mon Apr 07, 2008 4:45 pm Post subject: PM3000 Wiring |
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Put me on your list for more info, etc.
Sam Marlow
Vernon Little wrote:
[quote]
George:
I think I can help.
Today, I signed off for proto release on a new aviation audio product called
the AMX-2A Audio Mixer Amplifier.
It takes 10 monophonic audio sources, isolates and amplifies them into one
output. Sort of like Bob's isolation amplifier, but more inputs, mono only
and much smaller package.
Four of the audio inputs have volume controls to allow the adjustment of
audio levels from instruments that have no controls (e.g. Dynon EFIS). The
other six inputs are fixed level, assuming that you have source control of
the audio level from them (e.g. Comms, Traffic Monitors). All inputs are
10K ohm impedance.
The output can be connected into the aux audio input on an intercom. If
your intercom does not support aux inputs (Such as Sigtronics types), the
output can be wired directly into the headphone bus. Both mono and stereo
headphone buses are supported.
All of this is contained in a small package, with a 25-pin D-sub connector
(10 inputs, 2 outputs, power and 12 grounds). In fact, it's so small that
the entire unit mounts in a D-sub backshell.
I don't want to compete with Bob's isolation amplifier (after all it's his
site), but I think he offers it more as a public service than a profit
center. In that spirit, If Bob objects, I will back off.
Documentation is pending, but I can send a pinout pretty quickly.
Thanks, Vern
--
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grjtucson
Joined: 07 Apr 2008
Posts: 7
Location: Tucson, AZ
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| Posted: Mon Apr 07, 2008 11:04 pm Post subject: Re: PM3000 Wiring |
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Vern,
I'd love to hear more, particularly price, and assuming we're not overstepping things on the list. It sounds like exactly what I need.
Bill,
My PM3000 is older than that based on the manual provided. I haven't examined the intercom closely enough to confirm, but it's a fair bet that I don't have one of the newer ones.
All,
I'm likely to still be interested in rolling my own once I find out what buying one will cost (I'm frugal in the extreme). So if anyone can shed light on my questions, I'd be obliged.
George
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_________________
George Jenson - http://www.georgejenson.com
Tucson, AZ - RV-7 Standard Build
Empennage Completed 1/06
Wings Completed 11/06
Fuselage in Progress |
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