Static problem

[NigelL]

I’m getting static only in Ch40 which is the truckies channel here in Australia. Why would the static only be on that one channel? How can I get rid of it? Squelch is up to 9 with no more to go! Help please?

 

[K4EET]

I’m getting static only in Ch40 which is the truckies channel here in Australia. Why would the static only be on that one channel? How can I get rid of it? Squelch is up to 9 with no more to go! Help please?

Hi Nigel and welcome to Radio Reference!

Could you please give us more information about your environment? For example:

• Are you new to CB radio?
• Could the “static” just be a lot of simultaneous transmissions interfering with each other?
• Is Channel 40 in Australia AM, FM, and/or SSB?
• Does the static change in intensity by day or night?
• Handheld, mobile, or base transceiver?
• Make and model of the transceiver?
• Mobile or fixed installation?
• Truck, car, home, or commercial building?
• Antenna make and model?
• Where is the antenna installed?
• Is the static present 100% of the time or does it change in intensity as you move around?
• With antenna disconnected from the transceiver, is the static still present and at the same level?
• If you have a second CB transceiver, does it also have the same level of static on Channel 40?
• Are there any power lines or other noise generators in the vicinity of the CB transceiver’s antenna?
• Do you have a good installation with good grounding, etc.?
• Just to confirm, your CB frequencies are around 27 MHz?

There will probably be more questions based on your answers as we get a better understanding of your environment. It is interesting that the static is only on Channel 40. Hopefully one of us here can steer you in the right direction to figure this out.

 

[EAFrizzle]

Certain stations in the western Pacific area are known to run data and OTHR in 11 meters, if he's talking about 27 MHz. Could be almost anything if it's their UHF FM channels.

 

[NigelL]

Certain stations in the western Pacific area are known to run data and OTHR in 11 meters, if he's talking about 27 MHz. Could be almost anything if it's their UHF FM channels.

Thx for that. Bloody annoying the static. Radio tech unable to fix.

 

[hypersight]

Certain stations in the western Pacific area are known to run data and OTHR in 11 meters, if he's talking about 27 MHz. Could be almost anything if it's their UHF FM channels.

Quite certain the OP is talking about the UHF CB band. Channel 40 UHF is a truckers/highway channel.

 

[K6GBW]

Are you only hearing this static on one location, or is it on the channel even as you travel around?

 

[K4EET]

Are you only hearing this static on one location, or is it on the channel even as you travel around?

If the OP would respond to my Post #2, we would have a better handle on what they are up against.

 

[NigelL]

Hi Nigel and welcome to Radio Reference!

Could you please give us more information about your environment? For example:

• Are you new to CB radio?
• Could the “static” just be a lot of simultaneous transmissions interfering with each other?
• Is Channel 40 in Australia AM, FM, and/or SSB?
• Does the static change in intensity by day or night?
• Handheld, mobile, or base transceiver?
• Make and model of the transceiver?
• Mobile or fixed installation?
• Truck, car, home, or commercial building?
• Antenna make and model?
• Where is the antenna installed?
• Is the static present 100% of the time or does it change in intensity as you move around?
• With antenna disconnected from the transceiver, is the static still present and at the same level?
• If you have a second CB transceiver, does it also have the same level of static on Channel 40?
• Are there any power lines or other noise generators in the vicinity of the CB transceiver’s antenna?
• Do you have a good installation with good grounding, etc.?
• Just to confirm, your CB frequencies are around 27 MHz?

There will probably be more questions based on your answers as we get a better understanding of your environment. It is interesting that the static is only on Channel 40. Hopefully one of us here can steer you in the right direction to figure this out.

Hi there, sorry about delay getting back. I'm reasonably new to CB but have used bit for a few years on met 4WD.
Ion Aus we use CH40 as a truckies channel on the highways. Wow use FM. No change day or night, It does seem to disappear at times but returns again for a while. ICOM 455. Mobile. Landcruiser 300 Series Sahara. Antena installed on bullbar. Intensity doesn't change just constant for a long period then disappears but returns again later. Aerial was checked to be OK by radio tech. Yes around 27Mhz.
Sorry I'm not much help!

 

[K6GBW]

Well, if it's specific to channel 40 then its something putting out RF at that frequency. It could be coming from your vehicle? I'm assuming you've tried the radio with the vehicle off? Does you're vehicle have a solar panel mounted on it? What about LED headlights or auxillary lights? If it's not from your vehicle then it's going to be something in the area, in which case there's really nothing you can do about it. One thing to try is to put some ferrite beads on your coax to see if that knocks it down. It's possible the coax braid is acting as an antenna and picking up something.

 

[K6GBW]

I had a neighbor with and LED porch light. That thing produced a TON of noise. Took me months to find it. A new $30.00 light and the problem was solved. HF radio is very prone to noise, that's why you guys have UHF CB as well! Wish we had it here in the USA, but we don't.

 

[RFI-EMI-GUY]

Nigel, Your radio is not 27 MHz nor should your antenna be 27 MHz.

ICOM IC-455 is a UHF radio in Aus. Channel 40 is 477.400 MHz Road channel.

Your noise could be something 'in or on the air" like a nearby radio with stuck mike or other noise generator. Or if it seems to be everywhere, it could be generated by the vehicle itself. Unplug and aftermarket USB devices and chargers. Run the radio directly from the battery with vehicle turned off. Note modern vehicles have computers that stay awake generating hash for many minutes after the vehicle is switched, off, doors closed and locked with security FOB. These unintended noise generators will walk off frequency sometimes, perhaps to an adjacent channel * or simply fade. * Note; Channels 79 and 80 are directly adjacent. Are they affected?

 

[K4EET]

Hi there, sorry about delay getting back. I'm reasonably new to CB but have used bit for a few years on met 4WD.
Ion Aus we use CH40 as a truckies channel on the highways. Wow use FM. No change day or night, It does seem to disappear at times but returns again for a while. ICOM 455. Mobile. Landcruiser 300 Series Sahara. Antena installed on bullbar. Intensity doesn't change just constant for a long period then disappears but returns again later. Aerial was checked to be OK by radio tech. Yes around 27Mhz.
Sorry I'm not much help!

I would take a hard look at the noise disappearing and then returning. Is it periodic? That might give you some clues as to the source. These two questions could help you too:

• With antenna disconnected from the transceiver, is the static still present and at the same level?
• If you have a second CB transceiver, does it also have the same level of static on Channel 40?

If you drive around and the intensity does not change, then the noise is probably on your vehicle. And that would be especially true if the noise is still present when you disconnect the coax from the radio. Keep looking for the source and keep us posted.

 

[RFI-EMI-GUY]

Nigel meet Andrew... I am guessing the CAN-BUS ,....

Modified 300 Series Landcruiser | Hi all. I have had a GME uhf installed | Facebook

Hi all. I have had a GME uhf installed. Just wondering if anyone else is having issues with interference on channel 40 it seems to be something from vehicle

www.facebook.com

 

[NigelL]

Well, if it's specific to channel 40 then its something putting out RF at that frequency. It could be coming from your vehicle? I'm assuming you've tried the radio with the vehicle off? Does you're vehicle have a solar panel mounted on it? What about LED headlights or auxillary lights? If it's not from your vehicle then it's going to be something in the area, in which case there's really nothing you can do about it. One thing to try is to put some ferrite beads on your coax to see if that knocks it down. It's possible the coax braid is acting as an antenna and picking up something.

Yes I do have a solar panel om the roof rack. The Landcruiser 300 Series Sahara comes standard with LED headlights too.

 

[NigelL]

View attachment 201284

Nigel, Your radio is not 27 MHz nor should your antenna be 27 MHz.

ICOM IC-455 is a UHF radio in Aus. Channel 40 is 477.400 MHz Road channel.

Your noise could be something 'in or on the air" like a nearby radio with stuck mike or other noise generator. Or if it seems to be everywhere, it could be generated by the vehicle itself. Unplug and aftermarket USB devices and chargers. Run the radio directly from the battery with vehicle turned off. Note modern vehicles have computers that stay awake generating hash for many minutes after the vehicle is switched, off, doors closed and locked with security FOB. These unintended noise generators will walk off frequency sometimes, perhaps to an adjacent channel * or simply fade. * Note; Channels 79 and 80 are directly adjacent. Are they affected?

G'day there,

Ch 79 & 80 are not affected. Strangely the last couple opera days whilst driving through outback Australia it is working quite well. Go figure! Than ks for assisting me.