It can never hurt. I might just do that.
Thanks for your reply, Brian.
Kind regards,
Niels
----- Original Message -----
From: Brian Davies
To: europa-list@matronics.com
Sent: Tuesday, July 18, 2006 1:43 PM
Subject: RE: Europa-List: GPS interference-again
Neils,
It might be worth a phone call to Skyforce in the UK. Although they are
part of Honeywell the unit is built in a small factory near Chichester in t
he south of England. I have always found them very helpful. Their number
is +44 1243 783763.
Brian Davies
---------------------------------------------------------------------------
---
From: owner-europa-list-server@matronics.com [mailto:owner-europa-list-se
rver@matronics.com] On Behalf Of Niels Kock
Sent: 18 July 2006 09:34
To: europa-list@matronics.com
Subject: Europa-List: GPS interference-again
In spite of being a member of the Europa Club since its birth I am a newc
omer on the forum-scene.
What prompted me to enter this scene is interference problems twixt my Sk
ymap IIIC and my KX125 radio.
Similar problems, I can see from browsing the archive-index, have been di
scussed between Bryan Allsop and
Fred Fillinger a year ago, but there is some mysterious (to me) variation
in my case which I hope that Bryan or someone else
might be able to advise me about. But, please, slowly. I'm extremely dim-
whitted.
The problem, a chainsaw-like noise in the headphones when the GPS is on,
presented itself already in the distant past
with a Skymap-I, mounted in my Pa28. The solution was easy: I sold the P
iper, GPS included. Then built my present Europa
in which I mounted a Skymap II. All was bliss, until the noise after 3-4
years recurred. Yes, after 3-4 years! And only on some
frequenses, 119.52 where the interference was in bursts, and 118.5 ( and
a few others), where the noise was continuous.
The Skymap II was then replaced by the IIIC. Ah, peace and quiet again -
for a while- until the problem recurred. First on the
old 119,25 (my home base), then increasingly on many other frequenses, pr
edominantly in the lower half range.
As with Bryan receiving and transmitting cancels out the noise more or le
ss, but not intercom, and it is absolutely enough to
render you insane and deaf. The interference also vanishes when the GPS i
s removed from the panel and strapped to my
thigh, but that is a bit awkward.
The antenna line to the GPS runs from the spine of the Europa forwards un
der the left door to the panel, and the one to the
Radio along the right hand side of the aircraft. The antenna coax to the
radio (and the TXP) are rather long and are coiled-up
inside the right hand side of the panel. Further, it doesn't matter wheth
er I use the fixed antenna or a loose one on top of the
panel.
My friendly avionics Wizart at Billund has after much head-scrtatching ap
plied a choise of his wizardry to the problem:
Making sure that connections on the GPS-coax are OK, even surrounded said
connection with some foil-like screening-material,
decreasing the squelch of the radio, applying some ferrite-pearls on the
individual leads of the power-lead to the GPS, all to
no avail. He has also expressed thoughts about some electronic component
in the GPS being ailing after some years' use.
The owner of a neighbouring helicopter-company whose helicopters use the
Skymap IIIC too, had the same problem which,
so he told me, was found to originate from the blower in the GPS due to W
orn bearings. Be that as it may, the Skymap I and
II do not have blowers, and were still beset with the problem!
It may well be an antenna/screening problem. But why does this problem ar
ise after a some years' impeccable service, and
then seem to increase=3F
Can anybody help with an explation which even I might grasp, and a soluti
on=3F
Niels Kock,
Odense, Denmark
OY-ODA
--
Checked by AVG Release Date: 14/07/2006
--
14/07/2006
--
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