Today's Message Index:
----------------------
1. 12:11 AM - two com radios (JOHN TIPTON)
2. 12:18 AM - Re: two com radios (Bob Verwey)
3. 07:04 AM - Re: Radio not working (GNS430 and GMA240 setup) (Bill Watson)
4. 07:49 AM - Re: Radio not working (GNS430 and GMA240 setup) (David Lloyd)
5. 08:00 AM - Re: two com radios (nuckollsr)
6. 08:16 AM - Re: Zodiac 601 with Jabiru engine radio noise revisited. (nuckollsr)
7. 01:12 PM - Alternators on aircraft (Bill Bradburry)
8. 05:15 PM - Re: Alternators on aircraft (Bill Putney)
Message 1
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Hi Guys (Bob)
I'd like to fit 2 x radio coms, I don't want or need a full 'audio panel'
what are my options, I guess I really need is some kind of sophisticated
change-over switch
John
Message 2
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Subject: | Re: two com radios |
Intercom?
On 26 July 2013 09:07, JOHN TIPTON <jmtipton@btopenworld.com> wrote:
> jmtipton@btopenworld.com>
>
> Hi Guys (Bob)
>
> I'd like to fit 2 x radio coms, I don't want or need a full 'audio panel'
> what are my options, I guess I really need is some kind of sophisticated
> change-over switch
>
> John
>
>
Message 3
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Subject: | Re: Radio not working (GNS430 and GMA240 setup) |
I too ran into this.
In fact, it took a good bit of 'shimming' to get the G430, an SL30 and
a PMA9000EX to all 'line up'. They each have a slightly different
criteria for relating to the front panel.
Bill
On 7/24/2013 12:49 PM, David Lloyd wrote:
> Sacha,
> My suggestion is a bit far out, but, I have witnessed the 430 problem. . .
> When the 430 chassis box is mounted in the panel, it maybe set a bit
> too far back in the rack; maybe 1/8 inch or so. It must be fixed
> flush with the panel front. If it is not flush, when you slide the
> 430 in, all the pins do not fully engage into the chassis box receiver
> pin sockets. This can also happen when you install the 430 into a
> properly located chassis box, if the 430 is not fully drawn back into
> the chassis via the screw locking device.
> D
> ------------------------------------------------------------------------
>
> ----- Original Message -----
> *From:* Dave Saylor <mailto:dave.saylor.aircrafters@gmail.com>
> *To:* aeroelectric-list@matronics.com
> <mailto:aeroelectric-list@matronics.com>
> *Sent:* Wednesday, July 24, 2013 6:41 AM
> *Subject:* Re: AeroElectric-List: Radio not working (GNS430 and
> GMA240 setup)
>
> Do you have power to all the power inputs on the 430? It needs
> two separate inputs, and the separation isn't intuitive. It'll
> still do some comm stuff without comm power, IIRC.
>
> Other than that, if you're using 12V, are you sure it's a 12V
> unit, not 24?
>
> Dave Saylor
> 831-750-0284 CL
>
>
> On Wed, Jul 24, 2013 at 5:52 AM, Sacha <uuccio@gmail.com
> <mailto:uuccio@gmail.com>> wrote:
>
> <uuccio@gmail.com <mailto:uuccio@gmail.com>>
>
> Hi List,
> I have a problem that is driving me nuts. I have run out of
> ideas for trouble shooting this.
> I have a GN430 as com 1 and a GMA240 audio panel mounted in my
> Kitfox. My com2 is a handheld and I haven't wired it in yet.
> All the GNS and GMA functions (GPS, intercom, music, etc) work
> except for the radio: I cannot hear others and they cannot
> hear me, even though I can see the Tx and Rx symbols on the
> GNS's LCD display which indicates that the PTT buttons are
> working and that the radio is receiving *something*.
> Here are the steps I have taken so far towards trouble shooting:
> - I have checked that the headsets are working (the intercom
> works perfectly and they work on other a/c).
> - I have also checked that the radio works on my bench (I can
> hear transmissions that I send using a handheld radio, even
> without mounting an antenna on the GNS).
> - I have checked all the connections between the GNS and GMA
> connectors using a tester.
> - I have turned up the volume and turned down the squelch on
> the GMA and on the GNS.
> Has anyone had a similar experience? Am I missing something
> obvious that I should check? I suppose I haven't checked that
> the com1 channel on GMA works but I have no reason to doubt
> it, since the unit is new.
> Any help would be greatly appreciated!
> Sacha
>
Message 4
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Subject: | Re: Radio not working (GNS430 and GMA240 setup) |
Sacha,
I 'assume' what you are asking is a method to be able to "plug-in" a
handheld into the aircraft's antenna system.
There is and Bob has addressed this before in one of his many responses.
In summary, (others will point to the details. . .) One builds or buys a
small shielded box with the main ship's antenna cable going thru it via
BNC connectors, but, broken via a jack and plug set-up with the jack
connector accessible via the panel.
The handheld's antenna is removed and a short shielded cable is attached
and the other end does to the new switch box.input located on the panel.
The connection is made such that the main comm's are disconnected from
the antenna and the handheld now has command of the ship's antenna.
Bob or others will point to the detailed article & method of doing this
or where to purchase.....Dave
-------------------------------------------------------------------------
-------
----- Original Message -----
From: Sacha
To: aeroelectric-list@matronics.com
Sent: Thursday, July 25, 2013 9:20 PM
Subject: Re: AeroElectric-List: Radio not working (GNS430 and GMA240
setup)
David,
Absolutely. In fact I did exactly as you said. I still can't believe
it's all working, it feels like a luxury not to have to grab the
handheld everytime I need to make a radio call!
I've been wondering.... Is there a way that one can wire in the
handheld (Icom A3E) to the audio panel as a standby com2?
I already have an adaptor to use the headset with the handheld, but it
would require me to unplug the headset from the aircraft and plug it
into the handheld. Is there a way that I wire things so I just have to
select com2 on the audio panel?
Sacha
On Jul 26, 2013, at 0:19, "David Lloyd" <skywagon@charter.net> wrote:
Sacha,
I am glad my suggestion worked out to fix the 430 problem . . .
Here is another tip about installing the 430 back into the receiver
chassis whenever you have removed it.
I don't recommend that you draw the 430 back into it chassis by only
using the Allen drive screw-jack. This is hard on the small screw
assembly and could cause it to fail later on.
I always insert the 430 using my thumbs on the panel ends until I
feel engagement resistance. Then, I take up 1 turn on the screw jack,
then using my thumbs again, I press and rock the 430 further back into
the chassis and then use the screw-jack to take up the slack until it is
fully seated.
Two reasons for doing this..... using your fingers can detect if the
430 is hanging up going into the chassis and you can stop and
investigate. #2.. is to take the torqueing wear and tear off the screw-
jack mechanism. It is small and uses nylon parts. It is not very
durable if you are the ham fisted slam it in type.....
Dave
-------------------------------------------------------------------------
---
----- Original Message -----
From: Sacha
To: aeroelectric-list@matronics.com
Sent: Thursday, July 25, 2013 12:11 PM
Subject: Re: AeroElectric-List: Radio not working (GNS430 and
GMA240 setup)
Thanks all for your help. It turns out that the unit was not
sufficiently screwed in. The unit appeared to work but did not work
completely. The installation manual says it needs a minimum of three
turns of the Allen key and mine only had two turns. I wiggled the unit
and managed to squeeze an extra turn into it and bingo! It works
perfectly!
Thanks all for your help, I can't tell you how relieved I feel...
I had been trying to fix this for months.
My next project is to wire in the handheld (its an Icom A3E)...
Does anyone know if this is possible?
On Jul 24, 2013, at 22:36, Charlie England <ceengland7@gmail.com>
wrote:
Don't forget *all* the grounds, too. I tried to help a friend
with a similar issue several years ago; even spoke directly with a
Garmin tech & told him exactly which pins were hooked up. The tech told
me we were golden on all the wires. Radio worked when inserted in
another a/c. He finally took it to a radio shop. They took one look at
the back of the tray & said, "You're missing that ground right there."
They installed the ground, & everything worked. Sorry to say I don't
know which ground they added (there are several).
On 07/24/2013 01:23 PM, Sacha wrote:
Thanks guys. I hadn't thought of that but it seems like a good
place to look. When my GNS slides in, it does in fact have some trouble
doing so. I'll check that and report any findings.
Regards
Sacha
On Jul 24, 2013, at 19:50, Tim Andres <tim2542@sbcglobal.net>
wrote:
Dave's suggestion is a good one and there is a test
procedure in the 430 install manual to determine if you are getting
complete pin engagement from the tray/panel assembly
Check the audio panel for the same issue. Next pull all the
D subs and make sure all the pins are fully seated and don't push out
when you try to press them out.
Tim
Sent from my iPhone
On Jul 24, 2013, at 9:49 AM, "David Lloyd"
<skywagon@charter.net> wrote:
Sacha,
My suggestion is a bit far out, but, I have witnessed the
430 problem. . .
When the 430 chassis box is mounted in the panel, it maybe
set a bit too far back in the rack; maybe 1/8 inch or so. It must be
fixed flush with the panel front. If it is not flush, when you slide
the 430 in, all the pins do not fully engage into the chassis box
receiver pin sockets. This can also happen when you install the 430
into a properly located chassis box, if the 430 is not fully drawn back
into the chassis via the screw locking device.
D
------------------------------------------------------------------
----- Original Message -----
From: Dave Saylor
To: aeroelectric-list@matronics.com
Sent: Wednesday, July 24, 2013 6:41 AM
Subject: Re: AeroElectric-List: Radio not working
(GNS430 and GMA240 setup)
Do you have power to all the power inputs on the 430?
It needs two separate inputs, and the separation isn't intuitive. It'll
still do some comm stuff without comm power, IIRC.
Other than that, if you're using 12V, are you sure it's
a 12V unit, not 24?
Dave Saylor
831-750-0284 CL
On Wed, Jul 24, 2013 at 5:52 AM, Sacha
<uuccio@gmail.com> wrote:
<uuccio@gmail.com>
Hi List,
I have a problem that is driving me nuts. I have run
out of ideas for trouble shooting this.
I have a GN430 as com 1 and a GMA240 audio panel
mounted in my Kitfox. My com2 is a handheld and I haven't wired it in
yet.
All the GNS and GMA functions (GPS, intercom, music,
etc) work except for the radio: I cannot hear others and they cannot
hear me, even though I can see the Tx and Rx symbols on the GNS's LCD
display which indicates that the PTT buttons are working and that the
radio is receiving *something*.
Here are the steps I have taken so far towards trouble
shooting:
- I have checked that the headsets are working (the
intercom works perfectly and they work on other a/c).
- I have also checked that the radio works on my bench
(I can hear transmissions that I send using a handheld radio, even
without mounting an antenna on the GNS).
- I have checked all the connections between the GNS
and GMA connectors using a tester.
- I have turned up the volume and turned down the
squelch on the GMA and on the GNS.
Has anyone had a similar experience? Am I missing
something obvious that I should check? I suppose I haven't checked that
the com1 channel on GMA works but I have no reason to doubt it, since
the unit is new.
Any help would be greatly appreciated!
Sacha
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Message 5
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Subject: | Re: two com radios |
There are a number of options. Suggest you review the chapter on audio systems
and then come back for necessary clarification on selection of a solution.
Bob . . .
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=405341#405341
Message 6
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Subject: | Re: Zodiac 601 with Jabiru engine radio noise revisited. |
The voice is clear but along with the voice is a very loud hum (whine). This happens
with either the radio, or intercom being used, makes no difference.
This suggests that the noise is being injected into the microphone wiring such
it is heard on the intercom and carried through to the radio.
So far Ive installed a forest of tabs on the firewall, and rewired all grounds
to it
ALL grounds? Avionics grounds should be treated as shown in installation diagrams.
For example, microphone and headset grounds are generally routed with their
signal wires and grounded to the device that get the signals . . . intercom
or radio. This is illustrated and discussed in the chapter on audio systems.
Jabiru recommended twisting the alternator(PM) leads full length, this was done,
Pointless
Phone jack isolation washers where installed and checked for no errant grounds,
Good
regulator/rectifier hot lead was moved to the battery, ground was moved to forest
of tabs big bolt.
Okay
Mic audio and mic ground wires where separated as best as I could for most of their
length(short run anyway).
OOPS! See above.
Capacitor was installed across the bus to ground.
Okay but pointless. Bus filters never help.
The noise starts to appear at 1600 rpm and increases in volume up to max engine
rpm. The alternator cuts in at 1600 rpm. Disconnected the alternator and ran
it, no hum, everything is fine. If it is the alternator being the culprit, is
there anyway to deal with it?
The alternator is the greatest generator of noise in the airplane. It cannot be
filtered by any practical means . . . only careful crafting of system architectures
will isolated the victim radios from the potential antagonism of the alternator.
Thanks for everyone's suggestions so far but Im running out of ideas.
Run all three microphone wires in twisted trio (shielded too if handy but not a
driving requirement) from mic jack to the intercom. Do you have a stick mounted
push to talk? Make sure it doesn't get to ground anywhere at connects only
to the COMMON and PTT terminals on the mic jack.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=405343#405343
Message 7
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Subject: | Alternators on aircraft |
How often is there a scenario where an aircraft or automobile alternator
needs to be balanced? Is this something that needs to be considered?
Bill B
Message 8
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Subject: | Re: Alternators on aircraft |
Generally or specifically, never.
The only time they give trouble in general is if the bearings are worn out o
r if there's a bad diode. Rarely there's problems with bushes since not much
current goes through them. They do wear out like everything. Bad bearings a
re sometimes the result of an over tightened belt.
There's nothing to wear asymmetrically so if they're balanced from the facto
ry they're good for life.
Bill
On Jul 26, 2013, at 13:10, "Bill Bradburry" <bbradburry@bellsouth.net> wrote
:
> How often is there a scenario where an aircraft or automobile alternator n
eeds to be balanced? Is this something that needs to be considered?
>
> Bill B
>
>
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