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odd radio problem

 
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Richard Wheelwright



Joined: 15 Sep 2008
Posts: 111
Location: Halifax, West Yorkshire, UK
PostPosted: Thu Apr 10, 2014 10:26 am    Post subject: odd radio problem Reply with quote
I 'm have an odd radio problem..... the radio seems to lock up for no reason...... I have check the wiring ....... all connections...... I even have a radio on loan from LX Avionice and that does the same ????? I'm now thinking It could be my Dave Clark H10-13 head set, I have had a very short flight today 3 circuits, just to try with a different head set and all seemed OK but I will know better on a longer flight. The Radio is a funweak ATR 833 Has anyone ever come across this before?

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Richard Wheelwright
G-IRPW
First Flight 24th July 2013
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PostPosted: Thu Apr 10, 2014 10:39 am    Post subject: odd radio problem Reply with quote
On 10 Apr 2014, at 19:26, Richard Wheelwright wrote:

Quote:
the radio seems to lock up for no reason

Richard - can you describe the observed symptoms of this "lock up"? And is it cleared by powering off and on again?

I have the same radio but have not flown it yet.

in friendship

Rowland

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Richard Wheelwright



Joined: 15 Sep 2008
Posts: 111
Location: Halifax, West Yorkshire, UK
PostPosted: Thu Apr 10, 2014 10:59 am    Post subject: Re: odd radio problem Reply with quote
Rolland,
It locks up as in I can't change stations some times or alter the volume. but trying to transmit it shows TX as a normal transmission but ATC can not here me. If I turn the radio off and back on again all is well until it does it again. Their is no set time when it locks.. and I can not get it to do it with-out the engine running. Some times it is OK and others not.... I have wiggled every wire I can find.. But nothing is standing out to say this is where the fault is..

"Richard, I seem to recall a similar problem when G-OGAN was being checked out prior to first flight.
The problem was the jack plug sockets in the roof microphone and speaker jacks just touched causing a short,so make sure that there is enough space between the sockets.
Best regards
Andy Cullum. "

Andy, I have checked the mic and head set sockets and all seem well. This is a strange one !!! As nothing stands out to be the problem!!!!!!

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Richard Wheelwright
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PostPosted: Thu Apr 10, 2014 11:11 am    Post subject: odd radio problem Reply with quote
Richard,

If the radio has an embedded microprocessor it may be a product defect. I
have had experience where something will work fine in a metal or C/F
aircraft but not in a fiberglass aircraft. The reason is that there is no
attenuation of RF in the fiberglass structure and it finds its way into the
device, usually through the power feed. A well designed product should not
have this issue, however you could try adding some RF filtering on the
power, mic, headphone and ppt lines.

Paul

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PostPosted: Thu Apr 10, 2014 5:26 pm    Post subject: odd radio problem Reply with quote
One possibility is supply voltage spikes. Some embedded
microcontroller chips will freeze if the supply voltage goes outside
the spec even for a brief moment. I had that happen recently. The
spike was so brief that it did not register on the voltmeter.
Connecting a large capacitor across the power wires solved that
problem. You might want to give that a try.

On Thu, Apr 10, 2014 at 2:59 PM, Richard Wheelwright
<rpwheelwright(at)yahoo.co.uk> wrote:
Quote:


Rolland,
It locks up as in I can't change stations some times or alter the volume. but trying to transmit it shows TX as a normal transmission but ATC can not here me. If I turn the radio off and back on again all is well until it does it again. Their is no set time when it locks.. and I can not get it to do it with-out the engine running. Some times it is OK and others not.... I have wiggled every wire I can find.. But nothing is standing out to say this is where the fault is..

"Richard, I seem to recall a similar problem when G-OGAN was being checked out prior to first flight.
The problem was the jack plug sockets in the roof microphone and speaker jacks just touched causing a short,so make sure that there is enough space between the sockets.
Best regards
Andy Cullum. "

Andy, I have checked the mic and head set sockets and all seem well. This is a strange one !!! As nothing stands out to be the problem!!!!!!

--------
Richard Wheelwright
G-IRPW
First Flight 24th July 2013


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