Today's Message Index:
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1. 01:16 AM - 3mm foam cored wings for sale(unused and cockpit module also for sale) (roger cullum)
2. 01:43 AM - Re: Strobe noise in radio (Jan de Jong)
3. 11:35 AM - Re: 3mm foam cored wings for sale(unused and cockpit module also for sale) (kjburns@btinternet.com)
4. 12:24 PM - Re: Strobe noise in radio (Raimo Toivio)
5. 02:26 PM - Re: Strobe noise in radio (Kingsley Hurst)
Message 1
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| Subject: | 3mm foam cored wings for sale(unused and cockpit module also |
for sale)
Please contact me off forum by email rsc9@hotmail.co.uk
Thanks in anticipation
Roger Cullum
Rog. C
Message 2
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| Subject: | Re: Strobe noise in radio |
I don't know what you mean when you say "chew chew"?
Does it appear when receiving radio or always?
The power supply is a switcher. It induces large AC currents on its
supply lines and it contains a transformer that radiates as well. I
don't know the switching frequency. It should be beyond hearing.
Kuntzleman does not say.
The output should just be a single discharge once per second or so with
no AC component..
The "chew chew" could be the power supply charging its capacitor after
each discharge?
How did you prove that it is radiation coupling to the antenna?
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).
On 12/23/2015 1:15 AM, Kingsley Hurst wrote:
> Assembled wisdom . . . .
> I have the standard dipole aerial for the radio in the closeout of the
> fin as per Europa instructions with the cable running down the
> Starboard side of the fuselage.
> The strobe is from Kuntzleman with the power supply fitted under the
> baggage bay and the cable to the fin running down the Port side of the
> fuselage.
> By necessity, the two cables are closer together in the fin and in the
> upper part of the fin would be running fairly parallel to each other.
> The Kuntzleman strobe wires are not shielded.
> The problem is a CHEW CHEW noise in the headsets and by
> experimentation, I have proven the noise is coming in via the radio
> aerial.
> My question is . . . . What is the likelihood of success if I was to
> replace the unshielded wires to the strobe with a shielded cable?
> I realise moving the strobe to another location would likely be a
> solution but the fin is my preferred location if I can have it.
> Thanks in anticipation
> Kingsley in Oz
Message 3
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| Subject: | Re: 3mm foam cored wings for sale(unused and cockpit module |
also for sale)
Hi Roger,
Can you let me know what stage of build, and how much you want for wings please
.
Regards
Kevin Burns
Sent from my iPhone
> On 23 Dec 2015, at 09:15, roger cullum <rsc9@hotmail.co.uk> wrote:
>
>
> Please contact me off forum by email rsc9@hotmail.co.uk
> Thanks in anticipation
> Roger Cullum
>
> Rog. C
>
>
>
>
>
Message 4
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| Subject: | Re: Strobe noise in radio |
allekirjoitus2
Cheers, Raimo Toivio
Europa XS Mono OH-XRT #417 2007
LamcoCub M SE-VAY 2004
Bravo AS202T OH-NTM 1995
Antonov AN-2 TDSRM AirCamper HA-MDO 1987
Beechcraft C45 Twin OH-BLL 1953
37500 Lempaala
FINLAND
p +358-3-3753 777
m +358-40-590 1450
FLYING BREWERY
- only beer in the world brewed to aircraft standards
by pilots to pilots and also to normal people
raimo.toivio@rwm.fi <mailto:raimo.toivio@rwm.fi>
www.flyingbreweryfinland.fi <http://www.flyingbreweryfinland.fi/>
www.rwm.fi <http://www.rwm.fi/>
23.12.2015, 2:15, Kingsley Hurst kirjoitti:
> Assembled wisdom . . . .
> I have the standard dipole aerial for the radio in the closeout of the
> fin as per Europa instructions with the cable running down the
> Starboard side of the fuselage.
> The strobe is from Kuntzleman with the power supply fitted under the
> baggage bay and the cable to the fin running down the Port side of the
> fuselage.
> By necessity, the two cables are closer together in the fin and in the
> upper part of the fin would be running fairly parallel to each other.
> The Kuntzleman strobe wires are not shielded.
> The problem is a CHEW CHEW noise in the headsets and by
> experimentation, I have proven the noise is coming in via the radio
> aerial.
> My question is . . . . What is the likelihood of success if I was to
> replace the unshielded wires to the strobe with a shielded cable?
> I realise moving the strobe to another location would likely be a
> solution but the fin is my preferred location if I can have it.
> Thanks in anticipation
> Kingsley in Oz
Message 5
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| Subject: | Re: Strobe noise in radio |
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
Sent: Wednesday, December 23, 2015 7:36 PM
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 . . . =91Chew Chew=94 is the
best I can come up with I=92m 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
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