desertbird Posted July 30 Report Share Posted July 30 I am helping my friend who is getting his license program his Baofeng UV-5RTP to same as my Baofeng GM15. Got channel 1 programmed into his and was crazy inbound traffic, see video. I thought I had programming wrong till I left my office and what appears to be interference went away. What could cause this? Frequency is GMRS channel 1 462.5625. IMG_4691.MOV Quote Link to comment Share on other sites More sharing options...
desertbird Posted July 30 Author Report Share Posted July 30 Outside everything works, and appears I have programmed correctly. GMRS channel 2 has no issue. just wonder what things are close to that frequency and understand that a little bit. Quote Link to comment Share on other sites More sharing options...
WRHS218 Posted July 30 Report Share Posted July 30 I am not sure what would be close to that frequency but if the interference stops when you go outside I would guess it is something in your office. Your radio may not pick it up due to the receiver being less sensitive. Just a guess. Maybe a smart person can shed some light on the subject. Quote Link to comment Share on other sites More sharing options...
desertbird Posted July 30 Author Report Share Posted July 30 Also, the GM15 does not have the same interference on that channel. same antenna. I adjusted the squelch through all ranges on his, no real difference. Quote Link to comment Share on other sites More sharing options...
RayDiddio Posted July 30 Report Share Posted July 30 Splashy sounding. Almost spurious in a way. Quote Link to comment Share on other sites More sharing options...
SteveShannon Posted July 30 Report Share Posted July 30 It could be a battery charger, one of those wall warts, a computer power supply with problems, fluorescent lights, LED lights, almost anything. Unplug things until it stops. Such noise is not uncommon. WRXB215, Sonicgott and WRYZ926 3 Quote Link to comment Share on other sites More sharing options...
WRXP381 Posted July 30 Report Share Posted July 30 The only thing you be ever heard like that is the kids down the street playing games with the FRS radios Quote Link to comment Share on other sites More sharing options...
WRYZ926 Posted July 30 Report Share Posted July 30 I have to agree with @WRHS218 and @SteveShannon. The interference could be anything inside the building. It is common for computer monitors (and their power supplies) and unshielded network cables to cause interference. And those cheap gas station phone chargers are bad too. I had issues with unshielded network cables causing interference with my HF radio. And my some of my computer monitors cause interference with my Baofeng GT/UV-5R and Icom IC-T10 hand held radios. Quote Link to comment Share on other sites More sharing options...
emory Posted July 30 Report Share Posted July 30 8 minutes ago, WRYZ926 said: I have to agree with @WRHS218 and @SteveShannon. motion carries, i get this occasionally on my scanners. in the mornings it's accompanied by being able to pick up repeater output multiple states away in the morning and goes away by 8-0830 and returns in the evening. i bought an RF/EM meter to wand around and figure out where it was coming from and one of them was only happening when HVAC kicked on to run fans. another one still to be determined, it ends up being audible in other GMRS frequencies. if you have a hard time finding a meter that isn't overdoing it (some instruments are out there for thousands of dollars you don't need that) here's an old hacker trick: add "ghost hunting" to the search, since apparently "ghost hunters" follow EM/RF physics Raybestos 1 Quote Link to comment Share on other sites More sharing options...
WRYZ926 Posted July 30 Report Share Posted July 30 You can also use your hand held radio with a small yagi antenna to find and pin point sources of interference. The rubber duck antenna will get you close but the yagi will narrow the search down. WRHS218 1 Quote Link to comment Share on other sites More sharing options...
Raybestos Posted July 30 Report Share Posted July 30 37 minutes ago, emory said: if you have a hard time finding a meter that isn't overdoing it (some instruments are out there for thousands of dollars you don't need that) here's an old hacker trick: add "ghost hunting" to the search, since apparently "ghost hunters" follow EM/RF physics That's a great bit of advice! I always wanted one of those, anyway. Thing is, I have so many actual ghosts in my house, one of those things would probably go haywire. Quote Link to comment Share on other sites More sharing options...
nokones Posted July 30 Report Share Posted July 30 11 hours ago, SteveShannon said: It could be a battery charger, one of those wall warts, a computer power supply with problems, fluorescent lights, LED lights, almost anything. Unplug things until it stops. Such noise is not uncommon. An old computer with a processor clock speed close to your receive frequency will cause havoc. Raybestos and SteveShannon 2 Quote Link to comment Share on other sites More sharing options...
SteveShannon Posted July 30 Report Share Posted July 30 17 minutes ago, nokones said: An old computer with a processor clock speed close to your receive frequency will cause havoc. Yeah, I remember when we opened up a “466” (as I recall it was a 486 processor running at 66 MHz) computer case and the security guy’s handheld went ape. Raybestos 1 Quote Link to comment Share on other sites More sharing options...
nokones Posted July 30 Report Share Posted July 30 Back in the 80s when my Area Offices were changing over from Teletypes to Computer Terminals my company radio started going ape stuff every time that I was getting close to one of our Offices. It was wideband noise that tore up the radios. Quote Link to comment Share on other sites More sharing options...
nokones Posted July 30 Report Share Posted July 30 18 hours ago, desertbird said: I am helping my friend who is getting his license program his Baofeng UV-5RTP to same as my Baofeng GM15. Got channel 1 programmed into his and was crazy inbound traffic, see video. I thought I had programming wrong till I left my office and what appears to be interference went away. What could cause this? Frequency is GMRS channel 1 462.5625. IMG_4691.MOV I had to look up that tone on the chart. I don't think I ever seen anyone using that tone freq. Quote Link to comment Share on other sites More sharing options...
SteveShannon Posted July 30 Report Share Posted July 30 19 hours ago, desertbird said: I am helping my friend who is getting his license program his Baofeng UV-5RTP to same as my Baofeng GM15. Got channel 1 programmed into his and was crazy inbound traffic, see video. I thought I had programming wrong till I left my office and what appears to be interference went away. What could cause this? Frequency is GMRS channel 1 462.5625. IMG_4691.MOV Set Tone Mode to TSQL and it may help. desertbird 1 Quote Link to comment Share on other sites More sharing options...
quarterwave Posted July 30 Report Share Posted July 30 Not uncommon with those radios, mine goes ape at some traffic lights. desertbird 1 Quote Link to comment Share on other sites More sharing options...
GreggInFL Posted July 31 Report Share Posted July 31 It goes both ways. When I key up near my computer's UPS it triggers the alarm on the UPS. Go figure. WRUU653, WRXB215 and SteveShannon 2 1 Quote Link to comment Share on other sites More sharing options...
WRXB215 Posted July 31 Report Share Posted July 31 1 hour ago, GreggInFL said: When I key up near my computer's UPS it triggers the alarm on the UPS. Oh you could have fun with IT with that one. WRUU653, WRYZ926 and GreggInFL 1 2 Quote Link to comment Share on other sites More sharing options...
WRYZ926 Posted July 31 Report Share Posted July 31 59 minutes ago, WRXB215 said: Oh you could have fun with IT with that one. I would have fun that way when I was in the Army. The PTO driven generator on my truck mounted machine shop would totally block all radios within a 150 foot radius. WRUU653 1 Quote Link to comment Share on other sites More sharing options...
desertbird Posted July 31 Author Report Share Posted July 31 I remember when I was about 10 years old and Radio Shack had kits for crystal radios and all kinds of cool electronic stuff that fascinated me and I spent my lawn mowing money on. I hooked up a DC motor and some other weird stuff, I don't remember what I thought I was building but it scrambled the living room TV. This was when it was broadcast over the air, no cable at all, no satelite. I had so much fun pissing my Dad off with that little machine I made. I could hear him yelling "god damn it, here it goes again". He'd get off the couch and start banging it, which was the common TV fix back then. WRXR255, SteveShannon and WRUU653 3 Quote Link to comment Share on other sites More sharing options...
WRUU653 Posted August 1 Report Share Posted August 1 14 minutes ago, desertbird said: I remember when I was about 10 years old and Radio Shack had kits for crystal radios and all kinds of cool electronic stuff that fascinated me Ahh yes, I had one of those kits as a kid… Great story! I have a clear picture of what that would have looked like with my dad. Quote Link to comment Share on other sites More sharing options...
WSCS601 Posted August 1 Report Share Posted August 1 I've seen a treadmill knock a modem offline back in the dialup days and a MRI magnet starting up interfere with printers. Quote Link to comment Share on other sites More sharing options...
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