Today's Message Index:
----------------------
1. 02:34 AM - Re: Noisy Comm Radio (Bill & Sue)
2. 03:04 AM - Re: Noisy Comm Radio (Frans Veldman)
3. 10:33 AM - Re: Noisy Comm Radio (Christoph Both)
4. 12:44 PM - Re: Blinking Charge Light (h&jeuropa)
Message 1
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| Subject: | Re: Noisy Comm Radio |
Troy,
I had a similar problem with my a200/sigtronics/rotax setup - a loud rough whine
on transmit- and it was the earthing. I was pretty certain it was the earthing
but it took a couple of attempts to find the culprit- it may not be the radio
earth itself, in fact your description sounds as though the radio earth is
OK, poor power earths can induce the noise too. Good luck!
I'm not sure about the reception side of your problem other than my A200 sometimes
seems a bit deaf and other times is fine - I never did entirely resolve this
but I suspect it may be sensitive to stations slightly off frequency.
Regards
Bill
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=422541#422541
Message 2
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| Subject: | Re: Noisy Comm Radio |
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
On 04/28/2014 04:25 AM, Troy Maynor wrote:
> <wingnut54@charter.net>
>
> Hi All, I know this has been discussed before on the forum. I have
> looked til I bleary eyed and can't find the answer I'm looking
> for.
Looks to me (experienced HAM) that you have a failure in your antenna
or the coax cable. Get it checked with a SWR meter to see if it is
still ok.
If it is not ok it can cause the symptoms you described.
The SWR of the antenna can also go wrong if you change something close
to the antenna, like adding another antenna or a piece of metal.
Frans
> When I key the mike I have started getting a loud static noise or
> feedback that wasn't there before. I have near radio silence of
> incoming traffic until I am in the pattern and then it's scratchy.
> It sounds ok with the engine off but I don't know how far I'm
> transmitting or receiving on the ground. I am running an ICOM A200
> and Bob Archer antenna. The antenna is mounted on the fuselage wall
> behind the D panel port side. It has always performed well until
> recently but can't pin down what has changed. I have checked the
> security of all the grounds on and forward of the firewall, as far
> as I can tell. I was thinking it is time to pull the instrument
> panel but got to thinking about these torroids or suppressors. Can
> I just string some of these onto the RG58 coax back near the
> antenna and maybe help matters? I'd really appreciate any pointers
> to look at specifically. I have a Sigtronics intercom with the
> music switcher also. Can the presence of an IPAD communicating with
> a Stratus ADSB cause this? Most of what I found on the forum dealt
> with the transmitter affecting other equipment. This is not the
> case. I am hearing huge noise when I key the mike and can't here
> others calling me until I'm very near, like in the landing pattern.
> I can also hear the electric gyros in the headsets a little but
> that has always been there but not too noticeable, a little pop
> from the strobes faintly, but I can live with that. I just need to
> kill the giant, not the little noises necessarily. I'd like to
> figure out what change took place. Thanks, Troy Maynor 240 TT hours
> to date
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=422480#422480
>
>
>
>
>
>
>
>
>
>
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Message 3
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| Subject: | Re: Noisy Comm Radio |
Radio Troubled Europas:
I had exactly the same symptoms. I just replaced the entire antenna cable
and even more importantly, remade a new BNC connector (soldered type) into
my MGLV6 radio. This helped significantly to reduce the screeching noise.
Later this week I will replace the ROTAX912 regulator/rectifier which
introduced low frequency spikes to my bus. I hope this is the cure as the
spikes froze my radio and electric VSI as soon as RPM goes up.
Christoph Both
#223 TRI 912ULS 75+ hours
Nova Scotia, Canada
On 2014-04-29, 6:56 AM, "Frans Veldman" <frans@privatepilots.nl> wrote:
>
>-----BEGIN PGP SIGNED MESSAGE-----
>Hash: SHA1
>
>On 04/28/2014 04:25 AM, Troy Maynor wrote:
>> <wingnut54@charter.net>
>>
>> Hi All, I know this has been discussed before on the forum. I have
>> looked til I bleary eyed and can't find the answer I'm looking
>> for.
>
>Looks to me (experienced HAM) that you have a failure in your antenna
>or the coax cable. Get it checked with a SWR meter to see if it is
>still ok.
>If it is not ok it can cause the symptoms you described.
>The SWR of the antenna can also go wrong if you change something close
>to the antenna, like adding another antenna or a piece of metal.
>
>Frans
>
>
>> When I key the mike I have started getting a loud static noise or
>> feedback that wasn't there before. I have near radio silence of
>> incoming traffic until I am in the pattern and then it's scratchy.
>> It sounds ok with the engine off but I don't know how far I'm
>> transmitting or receiving on the ground. I am running an ICOM A200
>> and Bob Archer antenna. The antenna is mounted on the fuselage wall
>> behind the D panel port side. It has always performed well until
>> recently but can't pin down what has changed. I have checked the
>> security of all the grounds on and forward of the firewall, as far
>> as I can tell. I was thinking it is time to pull the instrument
>> panel but got to thinking about these torroids or suppressors. Can
>> I just string some of these onto the RG58 coax back near the
>> antenna and maybe help matters? I'd really appreciate any pointers
>> to look at specifically. I have a Sigtronics intercom with the
>> music switcher also. Can the presence of an IPAD communicating with
>> a Stratus ADSB cause this? Most of what I found on the forum dealt
>> with the transmitter affecting other equipment. This is not the
>> case. I am hearing huge noise when I key the mike and can't here
>> others calling me until I'm very near, like in the landing pattern.
>> I can also hear the electric gyros in the headsets a little but
>> that has always been there but not too noticeable, a little pop
>> from the strobes faintly, but I can live with that. I just need to
>> kill the giant, not the little noises necessarily. I'd like to
>> figure out what change took place. Thanks, Troy Maynor 240 TT hours
>> to date
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=422480#422480
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
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Message 4
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| Subject: | Re: Blinking Charge Light |
Problem solved! Pulled each fast-on terminal off the regulator and pushed it back
on again, cleaning the contact. Also cleaned the ground connection. All
is well. Thanks for the suggestions.
Jim & Heather
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=422557#422557
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