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[ultrafxr]

Helping friend troubleshoot CB problem on his 2011 CVO Road Glide, FLHTRUSE, and we’re stumped.  Problem:  when transmitting there is a squeal noticeable to him as the rider and to those who are receiving his transmission.  Only does this when engine running  - sometimes at idle, sometimes not.  But when riding the intensity of the squeal varies with engine rpm – higher rmp = more squeal.  I thought it was some kind of electrical interference.  Here’s what we’ve checked and done:

Checked all connections to be secure and not corroded – all ok.
Replaced CB module with used one procured from Fallen Cycles – no effect.
Changed spark plugs and spark plug wires – no effect.
Run a ground wire from the CB module mounting screw to the bike’s frame.
Switched helmet headsets and cables - no effect.

None of the above have made any improvement to the problem.  We’ve considered the PTT switch itself or even the wiring and wonder if there is a way to check these before going any further.

Suggestions appreciated.

[JoeVibe]

Have you checked the antenna cable for damage?

[RivRaptor]

The stator / charging system is wear I would start.  Also make sure battery is in good shape and fully charged while holding charge properly.  I would also try to run the bike if possible with the charging system disabled to isolate the problem / different battery.  I have seen noise issues with many vehicles due to these issues although I am not real familiar with the HD system.

[ultrafxr]

Have you checked the antenna cable for damage?

Thanks.  Good suggestion.
Have checked as much as we can see without tearing into things.  Swapped antenna but no change.  May pull tank, seat, etc., and look further at cable.

[ultrafxr]

The stator / charging system is wear I would start.  Also make sure battery is in good shape and fully charged while holding charge properly.  I would also try to run the bike if possible with the charging system disabled to isolate the problem / different battery.  I have seen noise issues with many vehicles due to these issues although I am not real familiar with the HD system.

Thanks.  I thought about the stator but it is charging normally and no issues or faults that we can detect.  Wonder if H-D's digital technician could detect any problems there. 

[Twolanerider]

If you haven't yet double check to make sure you've got very good grounds also Jerry.  Couple times over the years have chased noise in a radio that ended being due to poor grounds.

[WTF Chuck]

Is the squeal coming back out of the speakers???

[ultrafxr]

Is the squeal coming back out of the speakers???

Not sure as he's had his headset on.  I'll get him to check.

[ultrafxr]

If you haven't yet double check to make sure you've got very good grounds also Jerry.  Couple times over the years have chased noise in a radio that ended being due to poor grounds.

Thanks Don.  We have as far as we can tell all is good.

[ultrafxr]

Have you checked the antenna cable for damage?

UPDATE:  he tells me he bought a new cable and while he did not install it the cable was long enough for him to hook up to the radio and the CB antenna but it made no difference. 

[bigC]

Any chance that he mixed up the antenna for the CB and the AM/FM radio?

[ultrafxr]

Any chance that he mixed up the antenna for the CB and the AM/FM radio?

No. We checked that.

[Ironhorse]

I had CB issues on my 06 CVO Ultra.

It worked well sitting in the parking lot but not when running down the road. I sent it to IronCross.  They found microcracks in the board. The cracks became a problem at speed as the bike shook and vibrated. After repairs and upgrades it all works well now.

I mention this because perhaps his radio is experiencing a similar issue.

Mark

[ultrafxr]

I had CB issues on my 06 CVO Ultra.

It worked well sitting in the parking lot but not when running down the road. I sent it to IronCross.  They found microcracks in the board. The cracks became a problem at speed as the bike shook and vibrated. After repairs and upgrades it all works well now.

I mention this because perhaps his radio is experiencing a similar issue.

Mark

Thanks Mark.  Strange in that he did have his radio repaired by Iron Cross but then didn't ride much due to some health issues.  When he did get back to riding the CB problem arose.  Sent radio back to Iron Cross and everythign check OK and they told him the radio did not affect the CB.  I think perhaps it is time for him to revisit this with Iron Cross.

[r0de_runr]

Sounds like he is getting RF current running back down the coax.

I had to install a Ferrites on my coax up by the radio.

I put them on every wire I could find.

Also, run a ground strap from the trunk mounting bolt to the seat mounting bolt.


73's, DE N5GAN


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