Today's Message Index:
----------------------
1. 09:35 AM - Re: Radio Noise Redux (William Yamokoski)
2. 12:06 PM - Re: Radio Noise Redux (Robert L. Nuckolls, III)
3. 12:50 PM - Re: Radio Noise Redux (William Yamokoski)
4. 02:33 PM - Headphone & microphone plugs (Paul McAllister)
5. 03:29 PM - Re: Airmaster AC200 manual switch? (Ronald J. Parigoris)
6. 06:07 PM - Re: Headphone & microphone plugs (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: Radio Noise Redux |
--> AeroElectric-List message posted by: "William Yamokoski" <yamokosk@lakemichigancollege.edu>
Hi Folks
<Sounds like ignition noise getting into the mic audio. Try
pushing the mic hi leads out of their pins on the back of the
radio (pins 1 and 3 assuming you're using both). Key up the
radio with mic audio leads disconnected and see if the noise
goes away.
snip
Bob>
Just wondering what if anything I can deduce from the fact that
disconnecting audio leads had no effect on transmission noise.
Also, which of the following is most likely
1.) Ignition is making a normal noise, and some flaw in my other
wiring is allowing it in
2.) Ignition is making an abnormal noise and wiring is ok
Now that my radio life consists of using the handheld tied into ship's
antenna(which works great of course) I have much time to ponder what to
do about this ignition noise. New plugs and plug wires are on the
maintenance schedule anyway, so that issue will soon be addresses.
Again, thanks for any thoughts.
Bill Yamokoski, N4970y
Message 2
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| Subject: | Re: Radio Noise Redux |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <b.nuckolls@cox.net>
At 12:32 PM 5/7/2005 -0400, you wrote:
>--> AeroElectric-List message posted by: "William Yamokoski"
><yamokosk@lakemichigancollege.edu>
>
>Hi Folks
> <Sounds like ignition noise getting into the mic audio. Try
> pushing the mic hi leads out of their pins on the back of the
> radio (pins 1 and 3 assuming you're using both). Key up the
> radio with mic audio leads disconnected and see if the noise
> goes away.
>
> snip
>Bob>
>Just wondering what if anything I can deduce from the fact that
>disconnecting audio leads had no effect on transmission noise.
I'm having trouble getting my arms around this one.
The only other conduction path open to the radio is
the 14v source. Do I recall correctly that you
ran the radio from an independent battery. I recall
that you had problems with the experiment setup but
did you ultimately find out if an independent supply
helped? Have you tried any kind of filters in the
radio's supply line? Like:
http://aeroelectric.com/articles/filter/RS_Noise_Filters.pdf
> Also, which of the following is most likely
>1.) Ignition is making a normal noise, and some flaw in my other
>wiring is allowing it in
>2.) Ignition is making an abnormal noise and wiring is ok
None of these can be ruled out . . . yet. #1 is most
likely but in really intractable troubleshooting efforts,
I've learned not assume anything about what's under
every rock until you turn it over and see for yourself.
>Now that my radio life consists of using the handheld tied into ship's
>antenna(which works great of course) I have much time to ponder what to
>do about this ignition noise.
If you don't hear it in the hand held, then it's not coming
in through the antenna.
> New plugs and plug wires are on the
>maintenance schedule anyway, so that issue will soon be addresses.
>Again, thanks for any thoughts.
Sure wish you lived close by. This would be an interesting
problem to tackle first hand.
Bob . . .
Message 3
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| Subject: | Re: Radio Noise Redux |
--> AeroElectric-List message posted by: "William Yamokoski" <yamokosk@lakemichigancollege.edu>
< I'm having trouble getting my arms around this one.
The only other conduction path open to the radio is
the 14v source. Do I recall correctly that you
ran the radio from an independent battery. >
Yes...running from an independent battery eliminated the problem.
Running from ship's supply with mic pins 1 & 3 disconnected did not
eliminate noise. Running from independent battery with pins
disconnected resulted in no transmission at all, as if PTT had been
disabled. Also, when on ship's supply it didn't matter if I even had
headset mic plugged into its jack. Push pilot's PTT and hear the
machine gun. Push co-pilot's ptt with nothing plugged into either
co-pilot jack and hear the macnine gun
Once I get the fried radios back, would I learn anything by removing
the engine ground strap from the ground block and connecting the strap
directly into the ground next to the plane? Is that safe? I have a
few other components grounded to the engine side of the ground block, as
per your drawings. Any point doing the same with those, or am I just
going to fry something else?
Thanks for your thoughts Bob. I'm starting to think that life with a
handheld and portable intercom might just not be too bad :)
Bill Yamokoski
Message 4
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| Subject: | Headphone & microphone plugs |
--> AeroElectric-List message posted by: "Paul McAllister" <paul.mcallister@qia.net>
Hi all,
The cable on my Telex headset has failed near the jack and I need to re terminate
them.. Could someone tell me a good source for a mic and phone jack. Something
with a good cable relief would be nice.
Thanks, Paul
Message 5
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| Subject: | Re: Airmaster AC200 manual switch? |
--> AeroElectric-List message posted by: "Ronald J. Parigoris" <rparigor@suffolk.lib.ny.us>
Hello Bob
I will be using a Airmaster prop on 914UL Rotax.
The Airmaster Hub is called a AP332, it houses the electric motor and articulation
mechanism while holding Warp drive Blades. You could use the AP332 like this and
just have
an adjustable pitch prop.
Or you can add the AC200, which is a Constant speed black box controller.
http://www.airmasterpropellers.com/
Or can try http://www.airmasterpropellers.com/wa.asp?idWebPage=3474
I am pretty certain your Schematic will work with just the AP332, if it were plumbed
direct
to the electric motor.
When using the Constant speed black box controller, I downloaded as much info as
i could,
but it does not give enough detail as to what the switch does, perhaps it controls
the
motor direct somehow, or perhaps it is controlling some sort of circuit in the
AP332 that
is not direct to the motor.
Thx.
Sincerely
Ron Parigoris
"Robert L. Nuckolls, III" wrote:
> --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <b.nuckolls@cox.net>
>
> At 04:23 PM 5/6/2005 -0400, you wrote:
>
> >--> AeroElectric-List message posted by: "Ronald J. Parigoris"
> ><rparigor@suffolk.lib.ny.us>
> >
> >Hello Bob
> >
> >Thx. for the reply.
> >
> >What I am looking for is the requirements of the AC200 from the manual input.
>
> I guess I'm lost. What's the AC200?
>
> Bob . . .
>
Message 6
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| Subject: | Re: Headphone & microphone plugs |
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <b.nuckolls@cox.net>
At 04:29 PM 5/7/2005 -0500, you wrote:
>--> AeroElectric-List message posted by: "Paul McAllister"
><paul.mcallister@qia.net>
>
>Hi all,
>
>The cable on my Telex headset has failed near the jack and I need to re
>terminate them.. Could someone tell me a good source for a mic and phone
>jack. Something with a good cable relief would be nice.
I presume you're talking about PLUGS on the ends
of headset cords. The JACK is the receptacle that
mounts to the airplane.
The mil-spec mic plugs can be had from
Allied Electronics in their Switchcraft line. See
http://www.alliedelec.com/catalog/pf.asp?FN=291.pdf
The microphone plug is a Switchcraft #480
The phone plug isn't available in the mil spec version
but a good commercial substitute is:
The headphone plug is Switchcraft #250
Bob . . .
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