Reply
 
Thread Tools Search this Thread
 
Old 02 May 2005, 08:35   #1
Member
 
Country: UK - England
Town: STOCKPORT
Boat name: Smurf (blame the wife)
Make: Avon Searider
Length: 5.4
Engine: Yamaha 85
Join Date: Oct 2003
Posts: 127
Radoi interference

Hi all
i have developed a problem with (yes i know) a silva s10
i am getting this with the engine running + when trimming
is it just the case of a supressor or will i need to look elsewhere
all ideas and help will be apreciated
Barry
__________________

__________________
Barry Montague is offline   Reply With Quote
Old 02 May 2005, 14:37   #2
Member
 
Country: Other
Town: Oakley
Boat name: Zerstörer
Make: Ribcraft
Length: 5m +
Engine: Suzuki DF 140
MMSI: 235050131
Join Date: Jun 2003
Posts: 3,931
Barry,

I've got exactly the same problem.

Its been recomended to me to fit a supressor on the Radio Power lead. I shal purchase one from Halfords tomorrow and fit it at the weekend.

Its also possible to fit the suprressors on the spark plug leads but some web sites say this can damage the engine. So i shan't be doing that.

Let me know if you have any luck and I'll do th same for you.

Regards Nick R.
__________________

__________________
Biggles is offline   Reply With Quote
Old 02 May 2005, 14:48   #3
nik
Member
 
Country: UK - England
Town: east cowes
Make: academic
Length: no boat
Engine: fresh air
MMSI: N/A
Join Date: Sep 2003
Posts: 540
I think supressors may be fitted to the lt (low tension) side of the coil, but not to the spark plug leads (HT).
As an aside, I was on a boat with a yamaha o/b and it caused terrible interference on the radio. Then after a while it stopped. Electronic engine management maybe?
Nick.
__________________
nik is offline   Reply With Quote
Old 02 May 2005, 16:00   #4
Member
 
Country: UK - England
Town: Nr Faversham, Kent
Boat name: C Rider
Make: Avon
Length: 5m +
Engine: Yam 80
Join Date: Jan 2005
Posts: 479
Sounds like it might be easier to replace the crap radio

Tim'mers
__________________
Searider - The Best 5.4 x Far
Swifty is offline   Reply With Quote
Old 02 May 2005, 16:09   #5
Member
 
Country: UK - England
Town: STOCKPORT
Boat name: Smurf (blame the wife)
Make: Avon Searider
Length: 5.4
Engine: Yamaha 85
Join Date: Oct 2003
Posts: 127
Hi Swifty
yep carn't agree more but the brass is short
surley you fit things to sort out interfeerence rather than replace
things in your job
__________________
Barry Montague is offline   Reply With Quote
Old 03 May 2005, 05:53   #6
Member
 
Country: UK - England
Town: Nr Faversham, Kent
Boat name: C Rider
Make: Avon
Length: 5m +
Engine: Yam 80
Join Date: Jan 2005
Posts: 479
Quote:
Originally Posted by Barry Montague
Hi Swifty
yep carn't agree more but the brass is short
surley you fit things to sort out interfeerence rather than replace
things in your job
I understand your point. Generally in my industry we cannot afford to do cheap bodges as potentially alot of people will see the problem.

But as regards filters, I have found its better to cure the Interference at its source rather than cure it at the problem point, although this is not allways possible. If it is a power supply Interference then it will be strait forward to make a filter.

Tim'mers.
__________________
Searider - The Best 5.4 x Far
Swifty is offline   Reply With Quote
Old 03 May 2005, 06:04   #7
Member
 
Country: UK - England
Town: nr Lymington
Boat name: JU-JU
Make: Halmatic PAC22
Length: 6m +
Engine: 140.5 Mermaid
Join Date: Sep 2003
Posts: 1,400
Quote:
Originally Posted by Swifty
..... If it is a power supply Interference then it will be strait forward to make a filter.

Tim'mers.
Does it have to be a specific design or is a there general rule? Des
__________________
Scary Des is offline   Reply With Quote
Old 03 May 2005, 09:58   #8
Member
 
Country: UK - England
Town: Nr Faversham, Kent
Boat name: C Rider
Make: Avon
Length: 5m +
Engine: Yam 80
Join Date: Jan 2005
Posts: 479
Quote:
Originally Posted by Scary Des
Does it have to be a specific design or is a there general rule? Des
Bit of both!

The typical frequencies you are trying to remove are varying (idle to WOT) so an AC blocking circuit with a capacity of around 5 Amps is required. Simplest design is a large inductor in series to the positive. Quite often on car radios they have a plastic 'thing' in the power lead near to an inline fuse. I would try one of them first. It is a fairly hefty inductor inside.

PS.
A quick rumage in my bits and bobs box revealed a 220uH 3.5A and a 100uH 5.4A coil. You are welcome to try these out. PM me with an address.

Tim'mers.
__________________
Searider - The Best 5.4 x Far
Swifty is offline   Reply With Quote
Old 03 May 2005, 16:42   #9
Member
 
Country: Other
Town: Oakley
Boat name: Zerstörer
Make: Ribcraft
Length: 5m +
Engine: Suzuki DF 140
MMSI: 235050131
Join Date: Jun 2003
Posts: 3,931
I bought an interference suppressor from Halfords today for £7.95 and will fit it at the weekend and see how it goes.

If it doesn't work they can have it back.
__________________
Biggles is offline   Reply With Quote
Old 03 May 2005, 20:47   #10
Member
 
Hightower's Avatar
 
Country: UK - England
Town: Fareham
Length: 6m +
Join Date: Sep 2003
Posts: 7,855
Had a similar problem with my S10 after an engine refit, dam squelch wouldn't work whilst outboard was running. All I did was to move the coax away from the power lines a bit, not much but if you bunch up your cables into engine and everything else bunches I think you also will get good results like I did.

Good luck,

Andy
__________________

__________________
Hightower is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 21:50.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.