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Radio interference

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sideslip(at)tiscali.co.uk
Guest

Posted: Mon Jan 15, 2007 1:27 am Post subject: Radio interference

I have a new Jabiru 2200 (85hp) installed in a  Murphy Maverick with an Icom IC-A200 panel mount VHFand an external antenna  mounted throughthe fuselage skin midway between the cabin and fin using the  fuselage for a groundplane.

  

 I am picking up ignition interference when  receiving which increases with engine speed.

 I have tried running the radio from an independant  power supply to eliminate installation wiring and still get the same  problem, which seems to indicate that the antenna is picking up the radiated  noise.

 Does anyone have any suggestions on how to cure the  problem? Would a smaller insulated ground plane help?

  

 Geoff Leedham

  [quote][b]

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jetboy

Joined: 22 Jul 2006
Posts: 233

Posted: Sun Jun 24, 2007 2:27 pm Post subject: Re: Radio interference

If you havent seen this subject on the jabiru-engines  yahoo group then have a look in the files section for plots and cures of this common problem. My 2200 was helped most by

changing HT plug leads to Bosch inductive suppression leads type 385

adding ferrite beads to coil HT leads

I intend to change to R plugs next



Ralph

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_________________
Ralph - CH701 / 2200a

jab1059

Joined: 31 Aug 2009
Posts: 1
Location: tasmania, australia

Posted: Mon Aug 31, 2009 9:07 am Post subject: Re: Radio interference

Hi Geoff,



I was getting terrible interference in an Icom A200 radio (&intercom) in my Jabiru LSA-55, which increased with engine revs. It turned out that I had anchored a relay (which had been left "floating" behind the panel on it's wires) to the firewall with velcro. The vibration through the firewall was causing wires in the relay to vibrate and interfere with the radio/intercom. I un-tethered the relay, wrapped it in foam and all was fine. I guess you may not have such a relay, but worth a check.



Cheers,  Jim.

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