Today's Message Index:
----------------------
1. 01:22 AM - Re: Strobe noise in radio (Jan de Jong)
2. 05:21 AM - Re: Strobe noise in radio (Kingsley Hurst)
3. 06:26 AM - Re: Strobe noise in radio (Jan de Jong)
4. 10:50 AM - CS10 removal; Mod 76 (graeme bird)
5. 11:26 AM - Re: CS10 removal; Mod 76 (david park)
6. 01:12 PM - Re: CS10 removal; Mod 76 (Roger Sheridan)
7. 02:12 PM - Re: CS10 removal; Mod 76 (graeme bird)
8. 02:31 PM - Re: CS10 removal; Mod 76 (graeme bird)
Message 1
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| Subject: | Re: Strobe noise in radio |
Kingsley,
Where I lost you:
People like to have 5V USB charging points for their ipads etc. fed from
a 12V cigar lighter socket. These are very cheap and very noisy
switchers; interfere badly with AM radio like our COM. Mitigation
involves a filter on their 12V input and on their 5V output. Even so a
cheap switcher radiates and degrades radio reception.
If what we hear is the charging of the capacitor the source should be
the input power lines or the (transformer in) the box, not the output
wiring to the strobe.
With the box located at the bagage bay station it would then seem
strange that the antenna in the tail would be affected and an antenna
near the panel (although lower quality) not at all.
Maybe some more experimentation with antennas would be useful: 1. moving
a test antenna from panel to tail via the bagage bay 2. replacing the
tail dipole with a 50 ohm dummy load.
Jan
On 12/23/2015 11:24 PM, Kingsley Hurst wrote:
> RON I do have twisted pair power supply lines to the strobe power
> supply thanks.
> PETE Thanks for that tip . . . . . LED Strobe will be considered if
> all else fails.
> JAN Comments / answers embedded below . . . .
> Thank you all
> Kingsley
> *From:* Jan de Jong <mailto:jan_de_jong@casema.nl>
> *Sent:* Wednesday, December 23, 2015 7:36 PM
> *To:* europa-list@matronics.com <mailto:europa-list@matronics.com>
> *Subject:* Re: Europa-List: Strobe noise in radio
> I don't know what you mean when you say "chew chew"?
> *It is hard to describe a noise in words . . . Chew Chew is the best
> I can come up with Im afraid.*
>
> Does it appear when receiving radio or always?
> *Always whenever the radio is turned on. Volume of the noise can be
> controlled with the Vol control.*
> The "chew chew" could be the power supply charging its capacitor after
> each discharge?
> *Think you are right on the mark here Jan . . . . the noise
> immediately follows the flash and it does sound like the power supply
> charging its capacitor.*
>
> How did you prove that it is radiation coupling to the antenna?
> *1 Disconnected the power wires to the strobe unit to isolate the
> unit from the rest of the aircraft wiring and then supplied power from
> a second battery direct to the strobe unit. Made absolutely no
> difference to the noise.*
> *2 Disconnecting the aerial from the back of the radio completely
> eliminates the noise as does connecting an aerial from a hand held radio.*
>
> 5V USB switchers are made to behave in the presence of AM radio mainly
> by a filter on the input (2 capacitors and an inductor).
> *Sorry but you have lost me here.
> *
> Thanks again
> K
Message 2
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| Subject: | Re: Strobe noise in radio |
Many thanks for your much appreciated advice Jan.
I'm away from home now so can't do any more testing at the moment. Also, I'm
thinking I will just leave the problem in the 'too hard' basket for a while
and move on with more important things. The strobe is not critical for flig
ht so is not a high priority at the moment.
When the time comes, I'll refer again to your suggestions.
Thanks again and all the best for the festive season.
Kingsley
Sent from my iPhone
> On 24 Dec 2015, at 7:21 PM, Jan de Jong <jan_de_jong@casema.nl> wrote:
>
> Kingsley,
>
> Where I lost you:
> People like to have 5V USB charging points for their ipads etc. fed from a
12V cigar lighter socket. These are very cheap and very noisy switchers; in
terfere badly with AM radio like our COM. Mitigation involves a filter on th
eir 12V input and on their 5V output. Even so a cheap switcher radiates and d
egrades radio reception.
>
> If what we hear is the charging of the capacitor the source should be the i
nput power lines or the (transformer in) the box, not the output wiring to t
he strobe.
> With the box located at the bagage bay station it would then seem strange t
hat the antenna in the tail would be affected and an antenna near the panel (
although lower quality) not at all.
> Maybe some more experimentation with antennas would be useful: 1. moving a
test antenna from panel to tail via the bagage bay 2. replacing the tail di
pole with a 50 ohm dummy load.
>
> Jan
>
>> On 12/23/2015 11:24 PM, Kingsley Hurst wrote:
>> RON =93 I do have twisted pair power supply lines to the strobe pow
er supply thanks.
>>
>> PETE =93 Thanks for that tip . . . . . LED Strobe will be consider
ed if all else fails.
>>
>> JAN =93 Comments / answers embedded below . . . .
>>
>> Thank you all
>>
>> Kingsley
>>
>>
>>
>> From: Jan de Jong
>> Sent: Wednesday, December 23, 2015 7:36 PM
>> To: europa-list@matronics.com
>> Subject: Re: Europa-List: Strobe noise in radio
>>
>> I don't know what you mean when you say "chew chew"?
>> It is hard to describe a noise in words . . . =98Chew Chew=9D
is the best I can come up with I=99m afraid.
>>
>> Does it appear when receiving radio or always?
>> Always =93 whenever the radio is turned on. Volume of the noise ca
n be controlled with the Vol control.
>>
>> The "chew chew" could be the power supply charging its capacitor after ea
ch discharge?
>> Think you are right on the mark here Jan . . . . the noise immediately fo
llows the flash and it does sound like the power supply charging its capacit
or.
>>
>> How did you prove that it is radiation coupling to the antenna?
>> 1 Disconnected the power wires to the strobe unit to isolate the unit f
rom the rest of the aircraft wiring and then supplied power from a second ba
ttery direct to the strobe unit. Made absolutely no difference to the noise
.
>> 2 Disconnecting the aerial from the back of the radio completely elimi
nates the noise as does connecting an aerial from a hand held radio.
>>
>> 5V USB switchers are made to behave in the presence of AM radio mainly by
a filter on the input (2 capacitors and an inductor).
>> Sorry but you have lost me here.
>>
>> Thanks again
>> K
>
Message 3
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| Subject: | Re: Strobe noise in radio |
I absolutely need to get on with things as well.
Cheers.
Jan
On 12/24/2015 2:20 PM, Kingsley Hurst wrote:
> Many thanks for your much appreciated advice Jan.
>
> I'm away from home now so can't do any more testing at the moment.
> Also, I'm thinking I will just leave the problem in the 'too hard'
> basket for a while and move on with more important things. The strobe
> is not critical for flight so is not a high priority at the moment.
>
> When the time comes, I'll refer again to your suggestions.
>
> Thanks again and all the best for the festive season.
>
> Kingsley
>
> Sent from my iPhone
>
> On 24 Dec 2015, at 7:21 PM, Jan de Jong <jan_de_jong@casema.nl
> <mailto:jan_de_jong@casema.nl>> wrote:
>
>> Kingsley,
>>
>> Where I lost you:
>> People like to have 5V USB charging points for their ipads etc. fed
>> from a 12V cigar lighter socket. These are very cheap and very noisy
>> switchers; interfere badly with AM radio like our COM. Mitigation
>> involves a filter on their 12V input and on their 5V output. Even so
>> a cheap switcher radiates and degrades radio reception.
>>
>> If what we hear is the charging of the capacitor the source should be
>> the input power lines or the (transformer in) the box, not the output
>> wiring to the strobe.
>> With the box located at the bagage bay station it would then seem
>> strange that the antenna in the tail would be affected and an antenna
>> near the panel (although lower quality) not at all.
>> Maybe some more experimentation with antennas would be useful: 1.
>> moving a test antenna from panel to tail via the bagage bay 2.
>> replacing the tail dipole with a 50 ohm dummy load.
>>
>> Jan
>>
>> On 12/23/2015 11:24 PM, Kingsley Hurst wrote:
>>> RON I do have twisted pair power supply lines to the strobe power
>>> supply thanks.
>>> PETE Thanks for that tip . . . . . LED Strobe will be considered
>>> if all else fails.
>>> JAN Comments / answers embedded below . . . .
>>> Thank you all
>>> Kingsley
>>> *From:* Jan de Jong <mailto:jan_de_jong@casema.nl>
>>> *Sent:* Wednesday, December 23, 2015 7:36 PM
>>> *To:* europa-list@matronics.com <mailto:europa-list@matronics.com>
>>> *Subject:* Re: Europa-List: Strobe noise in radio
>>> I don't know what you mean when you say "chew chew"?
>>> *It is hard to describe a noise in words . . . Chew Chew is the
>>> best I can come up with Im afraid.*
>>>
>>> Does it appear when receiving radio or always?
>>> *Always whenever the radio is turned on. Volume of the noise can
>>> be controlled with the Vol control.*
>>> The "chew chew" could be the power supply charging its capacitor
>>> after each discharge?
>>> *Think you are right on the mark here Jan . . . . the noise
>>> immediately follows the flash and it does sound like the power
>>> supply charging its capacitor.*
>>>
>>> How did you prove that it is radiation coupling to the antenna?
>>> *1 Disconnected the power wires to the strobe unit to isolate the
>>> unit from the rest of the aircraft wiring and then supplied power
>>> from a second battery direct to the strobe unit. Made absolutely no
>>> difference to the noise.*
>>> *2 Disconnecting the aerial from the back of the radio completely
>>> eliminates the noise as does connecting an aerial from a hand held
>>> radio.*
>>>
>>> 5V USB switchers are made to behave in the presence of AM radio
>>> mainly by a filter on the input (2 capacitors and an inductor).
>>> *Sorry but you have lost me here.
>>> *
>>> Thanks again
>>> K
>>
Message 4
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| Subject: | CS10 removal; Mod 76 |
So all the instructions followed for CS10 removal but I cant see how it is going
to come out. Seems like CS08 would need to come out. Quite a job undoing all
the bolts. Also seem to have some mildew forming in the area for which I would
tend to use bleach on but I dont want to introduce corrosion - any ideas on
that?
--------
Graeme Bird
G-UMPY
Mono Classic/XS FFW 912S/Woodcomp 3000/3W
Newby: 200 hours 4 years on the Mono
g(at)gdbmk.co.uk
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=451400#451400
Message 5
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| Subject: | Re: CS10 removal; Mod 76 |
I am about to attack this job after Christmas and the instructions say it should
clear the CS08?
Dave G-LDVO
Sent from my iPhone
> On 24 Dec 2015, at 18:49, graeme bird <graeme@gdbmk.co.uk> wrote:
>
>
> So all the instructions followed for CS10 removal but I cant see how it is going
to come out. Seems like CS08 would need to come out. Quite a job undoing all
the bolts. Also seem to have some mildew forming in the area for which I would
tend to use bleach on but I dont want to introduce corrosion - any ideas on
that?
>
> --------
> Graeme Bird
> G-UMPY
> Mono Classic/XS FFW 912S/Woodcomp 3000/3W
> Newby: 200 hours 4 years on the Mono
> g(at)gdbmk.co.uk
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=451400#451400
>
>
>
>
>
>
>
>
>
>
Message 6
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| Subject: | Re: CS10 removal; Mod 76 |
The old mod 46 instructions apply and are slightly different.
You also need to disconnect the flap pushrod.
Ill be impressed if you get that job done tomorrow!
Merry Xmas.
> On 24 Dec 2015, at 19:25, david park <dpark748@icloud.com> wrote:
>
>
> I am about to attack this job after Christmas and the instructions say it should
clear the CS08?
> Dave G-LDVO
>
> Sent from my iPhone
>
>
>> On 24 Dec 2015, at 18:49, graeme bird <graeme@gdbmk.co.uk> wrote:
>>
>>
>> So all the instructions followed for CS10 removal but I cant see how it is going
to come out. Seems like CS08 would need to come out. Quite a job undoing
all the bolts. Also seem to have some mildew forming in the area for which I would
tend to use bleach on but I dont want to introduce corrosion - any ideas
on that?
>>
>> --------
>> Graeme Bird
>> G-UMPY
>> Mono Classic/XS FFW 912S/Woodcomp 3000/3W
>> Newby: 200 hours 4 years on the Mono
>> g(at)gdbmk.co.uk
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=451400#451400
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
>
>
>
Message 7
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| Subject: | Re: CS10 removal; Mod 76 |
mod 46 ? Can't find and info on that where could I find it?
Sounds like a good tip to disconnect the flap control.
Felt like a gynaecologist today working through a 4 x 5 " hole !
Took me from 11:30 to 5:00 to get all the nuts undone and out. That was on my own,
another pair of hands would have helped a bit.
--------
Graeme Bird
G-UMPY
Mono Classic/XS FFW 912S/Woodcomp 3000/3W
Newby: 200 hours 4 years on the Mono
g(at)gdbmk.co.uk
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=451404#451404
Message 8
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| Subject: | Re: CS10 removal; Mod 76 |
found mod 46 thanks.
[http://www.europaowners.org/main.php?g2_view=core.DownloadItem&g2_itemId=81847]
--------
Graeme Bird
G-UMPY
Mono Classic/XS FFW 912S/Woodcomp 3000/3W
Newby: 200 hours 4 years on the Mono
g(at)gdbmk.co.uk
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=451405#451405
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