Copper Talk » Ask The Tech » Radio's Mobile » Archived Messages » High amount of AC line noise ( superstar 3900 ) « Previous Next »

Author Message
Top of pagePrevious messageNext messageBottom of page Link to this message

Al_lafon
Junior Member
Username: Al_lafon

Post Number: 29
Registered: 3-2005
Posted on Thursday, June 02, 2005 - 11:29 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Hello anyone having problem with high ac line noise in the 3900 or know a fix ?
Top of pagePrevious messageNext messageBottom of page Link to this message

Bruce
Senior Member
Username: Bruce

Post Number: 2778
Registered: 9-2003
Posted on Thursday, June 02, 2005 - 1:56 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

if you meen from the outside you need to contact the power company
Top of pagePrevious messageNext messageBottom of page Link to this message

Tech808
Moderator
Username: Tech808

Post Number: 5944
Registered: 8-2002


Posted on Thursday, June 02, 2005 - 7:40 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Al_lafon,

Do you get this interference ONLY with the 3900 or with all radios you try and use?

You could be getting interference from any number of sources as well as the local power lines or something located in or around your house.

Are you using this in a Mobile or Base setup?

It you are using it in a mobile set up, you should be able to drive around and locate the problem as the noise get's louder.

Lon
Tech808
CEF808
N9OSN
Top of pagePrevious messageNext messageBottom of page Link to this message

Al_lafon
Junior Member
Username: Al_lafon

Post Number: 32
Registered: 3-2005
Posted on Thursday, June 02, 2005 - 9:35 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

This is in a Mobile setup seems like all the local power lines have high noise around them.
Also get noise at the lights.
Top of pagePrevious messageNext messageBottom of page Link to this message

Bruce
Senior Member
Username: Bruce

Post Number: 2785
Registered: 9-2003
Posted on Friday, June 03, 2005 - 7:13 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Some lines are so bad they wipe out 2 meters!
Most power companys if you can tell them where its the worse will make a efford to fix it.

And if they dont well in realy bad cases the FCC will help .......

"The Federal Communications Commission notified Duquesne Light, on December 17, 2002, that it had received a complaint of harmful radio interference apparently caused by power line hardware owned by Duquesne Light. "
Top of pagePrevious messageNext messageBottom of page Link to this message

Al_lafon
Junior Member
Username: Al_lafon

Post Number: 33
Registered: 3-2005
Posted on Friday, June 03, 2005 - 11:41 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Yes this is all good info but can i do domething
to the radio to help with this.
Top of pagePrevious messageNext messageBottom of page Link to this message

Al_lafon
Junior Member
Username: Al_lafon

Post Number: 34
Registered: 3-2005
Posted on Friday, June 03, 2005 - 11:50 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

OK sorry let me put it this way i am looking for
mods that will clean up the rec. in this radio
main boad is ept690010c like known bugs or fixs
that may be out on this radio
Top of pagePrevious messageNext messageBottom of page Link to this message

Vanillagorilla
Member
Username: Vanillagorilla

Post Number: 52
Registered: 4-2005


Posted on Friday, June 03, 2005 - 2:17 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)


A noise filter could be an option but I've never used one that worked as well as I thought it should...BTW it not just your radio. It'll happen to all my radios including My 3900 , Grant XL and 148GTL. Traffic lights I get the buzzing/Whirr that sounds like a small plane is landing on my roof and the High tension wires wreak havok on my recieve! I only saw a difference when I swapped a fiberglass Francis 5.5' whip on my roof in place of the Steel Wilson 2000. I have to say the Wilson was the better antenna overall so I swapped back and I chose to live with some interferance...the vol. or squelch is only an arms length away . :-)
Good luck!

Hank '905
CEF 559
Top of pagePrevious messageNext messageBottom of page Link to this message

Al_lafon
Junior Member
Username: Al_lafon

Post Number: 35
Registered: 3-2005
Posted on Friday, June 03, 2005 - 9:58 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

OK maybe thats it using a Wilson 2000 here last time i had a radio was back in the mid 80s and
was using full 1/4 wave on the pickup i had.
I was running a jackson then also. i don't remember hearing that much noise from ac lines
or stop lights. Will be changing out frist amp
transistor to a 2sc2999 i do know that help some
i'd like to find some more tips or tricks for this
radio if someone has links or notes it be real nice.
Top of pagePrevious messageNext messageBottom of page Link to this message

Bruce
Senior Member
Username: Bruce

Post Number: 2794
Registered: 9-2003
Posted on Friday, June 03, 2005 - 10:59 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

does the 3900 use a 2sc1674 rf stage?
Top of pagePrevious messageNext messageBottom of page Link to this message

Al_lafon
Junior Member
Username: Al_lafon

Post Number: 41
Registered: 3-2005
Posted on Tuesday, June 21, 2005 - 10:01 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Ok i changed the frist rf amp in the radio tr or q 17 to a 2SC2999 that did a real good job of cleaning up this radio.
Top of pagePrevious messageNext messageBottom of page Link to this message

Bruce
Senior Member
Username: Bruce

Post Number: 2877
Registered: 9-2003
Posted on Tuesday, June 21, 2005 - 10:45 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

yep the 2999 realy does help!
Top of pagePrevious messageNext messageBottom of page Link to this message

Yankee
Advanced Member
Username: Yankee

Post Number: 691
Registered: 7-2003
Posted on Wednesday, June 22, 2005 - 2:03 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Just for a because. On my '89 Mercury Sable that has an in tank 12 volt fuel pump. My Cobra 138 XLR picks up so much noise from the pump and other electronics in the car, that the 138 XLR is all but useless in the mobile. And now the just because, I for just a few days changed radios to my radio I run base the Uniden Grant XL, now this was before the Grant had the change to the 2SC2999 and the Grant cleaned up about 90% of the noise, still got a little noise off the directionals and wiper motor, but not near as bad as my Cobra 138 XLR. Comes down to that the filtering in the Cobra 148 GTL, 148F GTL, Uniden Grant XL/LT is that good even before the transistor change. Looking for a good 148 or Grant to keep set up for the mobile.
Carl CEF/357
Top of pagePrevious messageNext messageBottom of page Link to this message

Hotwire
Intermediate Member
Username: Hotwire

Post Number: 410
Registered: 1-2005


Posted on Saturday, June 25, 2005 - 2:35 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

My Imax is near my house power lines, it was about 5 feet away and I got terrible ac noise. I elevated the antenna 30 feet higher and it totally eliminated all the noise. For mobile I have a good NB/ANL and use an antenna with plastic shell. I CAN tell between a plastic wrapped antenna and a bare antenna.
Top of pagePrevious messageNext messageBottom of page Link to this message

Road_warrior
Advanced Member
Username: Road_warrior

Post Number: 678
Registered: 7-2004
Posted on Saturday, June 25, 2005 - 3:11 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

I also get bad powerline noise here
in my area in PA. Around town my
mobile radio buzzes up a storm.
When you get to the out-skirts of town
it quiets down.

Add Your Message Here
Post:
Username: Posting Information:
This is a private posting area. Only registered users and moderators may post messages here.
Password:
Options: Enable HTML code in message
Automatically activate URLs in message
Action: