VHF Buffs please - interference-

[iangrant]

Help please - I have interference on transmission on my VHF. I have traced the source to the fridge compressor, it is all OK with the fridge off, clear as a bell.
Which condenser(?) will work and how do I wire it into the compressor supply?

BTW - the inverter interferes with the SSB, but I guess there is no fix for that?

Thanks


Ian

 

[itsonlymoney]

Had a similar problem with my VHF. Culprit for me was alternater, however I beleive that the cure is the same.
Fit a noise suppreser (available all good car part shops ie. Halfords) to the VHF power supply. Only a fiver or thereabouts and easy to fit just follow instructions only three wires.
Cured my problem 100%
Good luck - Ian

 

[wooslehunter]

That's if it's getting in through the power lines.

If you can, power up the VHF with a separate battery on short leads. If it's still there, the chances are a noise supressor on the power lines won't work. If it goes then go for the supressor. Having said that the supressor is so cheap you could just try it anyway.

 

[malcp]

I would have thought it would have been better to suppress the noise at source, ie place the suppressor across the fridge compressor supplies and as close as possible to it. That way it reduces the amount of wiring with the noise on it which would only radiate to everything else which may or may not be susceptable.

 

[gjgm]

its only money

I tried fitting one to the alternator itself, but with no joy. Quite how are you fitting it to the VHF power supply?

 

[ParaHandy]

ian, you might have a sealed compressor motor in the fridge which are typically AC and which have an inbuilt inverter to convert to AC. the inverter will be electrically v. noisy.

other thought is if the fridge has a two pole plug connector, which can corrode easily and become a source of interference, replace it?

 

[iangrant]

'tis an old one I'll have to take a look tomorow. It's in an awful place under the sink - sod it..

Ian

 

[scarlett]

Wasn't there something on here a few years ago where Danfoss said it was not possible to eliminate the noise from their fridge motor on VHF reception.

I have overcome it for reception by by using a WorldSpace Radio during the day and turning the fridge off at night when the solar panel is no use anyway!

[It doesn't interfere with my VHF communications radios.]

Happy.

 

[iangrant]

Guess what - it's a danfoss - I've yet to try the surpressor - I'll let ye know.. bzzzzz crackle bzzzzzzzz


Ian

 

[Robin]

Most refrigeration units on boats ARE Danfoss based as is ours and we have no interference nor did we on our previous boat which also had Danfoss. I would add both a capacitor to the compressor and a ferrite (the cylindrical thing you see clamped on computer leads etc) to the power feed to the VHF, plus check also the connection to your aerial lead braid isn't corroded.

Robin