Posted: 8/2/2016 6:42:44 PM EDT
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this isnt ham related, but if someone could help me out, id appreciate it. i have a uniden bct8 scanner that i use, and i have a desktop computer that when i turn it on, it really affects the scanner and whatever im listening to goes to crap. ive tried unplugging one thing at a time when the computer was on but no luck. could it be the power supply? thanks! |
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this is the monitor https://www.amazon.com/gp/product/B0058UUR6E/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1 and this is the power supply im using https://www.amazon.com/gp/product/B004LB5AZY/ref=oh_aui_detailpage_o05_s01?ie=UTF8&psc=1 im stumped on what to do.  |
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Quoted:
im stumped on what to do. Answer the questions for troubleshooting assistance. Does the monitor have an external power supply (aka "brick")? If so, perform these steps. If not, do them anyway, but it is more probable that the power brick is the problem than the monitor itself. Turn on scanner, verify minimal static and good reception. Turn on monitor (NOT PC) and compare scanner reception. Better or worse? If worse, the problem is likely your brick on the monitor. If not worse, turn off monitor, turn on PC. Does reception change for the worse? Once this is narrowed down to the specific device causing the problem there are more troubleshooting steps we can take, like adding ferrite chokes to the power cord. |
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Quoted: Answer the questions for troubleshooting assistance. Does the monitor have an external power supply (aka "brick")? No If so, perform these steps. If not, do them anyway, but it is more probable that the power brick is the problem than the monitor itself. Turn on scanner, verify minimal static and good reception. Turn on monitor (NOT PC) and compare scanner reception. Better or worse? same, no difference when turning monitor on and off If worse, the problem is likely your brick on the monitor. If not worse, turn off monitor, turn on PC. Does reception change for the worse? yep! Once this is narrowed down to the specific device causing the problem there are more troubleshooting steps we can take, like adding ferrite chokes to the power cord. Quoted: Quoted: im stumped on what to do. Answer the questions for troubleshooting assistance. Does the monitor have an external power supply (aka "brick")? No If so, perform these steps. If not, do them anyway, but it is more probable that the power brick is the problem than the monitor itself. Turn on scanner, verify minimal static and good reception. Turn on monitor (NOT PC) and compare scanner reception. Better or worse? same, no difference when turning monitor on and off If worse, the problem is likely your brick on the monitor. If not worse, turn off monitor, turn on PC. Does reception change for the worse? yep! Once this is narrowed down to the specific device causing the problem there are more troubleshooting steps we can take, like adding ferrite chokes to the power cord. |
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There are many here who know more than I do, but I'll step up and take a swing at it.
If the PC has a metal case, and you run it with the case closed, we can pretty much rule it out as the source of the RFI. I'm going to guess it's the power cord that's radiating and it will need one or more ferrite chokes. Hopefully someone will be along soon to give us a source for them, and possibly instructions for using them. |
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Quoted:
There are many here who know more than I do, but I'll step up and take a swing at it. If the PC has a metal case, and you run it with the case closed, we can pretty much rule it out as the source of the RFI. I'm going to guess it's the power cord that's radiating and it will need one or more ferrite chokes. Hopefully someone will be along soon to give us a source for them, and possibly instructions for using them. Ferrite chokes on the power cord and the cat5 eathernet cord worked for me. |
| I use heavily shielded RF cabling to keep my computers out of my receivers. Superflex heliax has a solid copper shield that does a fine job of keeping junk out. You can also use a double shielded coax such as RG-400. One single approach may not solve your issue. You may need to do several things to solve this (upgrade to highly shielded cable, use ferrite chokes on computers, move antennas, etc.). |
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Quoted:
Ferrite chokes on the power cord and the cat5 eathernet cord worked for me. Quoted:
Quoted:
There are many here who know more than I do, but I'll step up and take a swing at it. If the PC has a metal case, and you run it with the case closed, we can pretty much rule it out as the source of the RFI. I'm going to guess it's the power cord that's radiating and it will need one or more ferrite chokes. Hopefully someone will be along soon to give us a source for them, and possibly instructions for using them. Ferrite chokes on the power cord and the cat5 eathernet cord worked for me. Where can he get ferrite chokes? What size should he get? This is the stuff I don't know. |
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Quoted:
Where can he get ferrite chokes? What size should he get? This is the stuff I don't know. Quoted:
Quoted:
Quoted:
There are many here who know more than I do, but I'll step up and take a swing at it. If the PC has a metal case, and you run it with the case closed, we can pretty much rule it out as the source of the RFI. I'm going to guess it's the power cord that's radiating and it will need one or more ferrite chokes. Hopefully someone will be along soon to give us a source for them, and possibly instructions for using them. Ferrite chokes on the power cord and the cat5 eathernet cord worked for me. Where can he get ferrite chokes? What size should he get? This is the stuff I don't know. RadioShack has ferrite beads jes,t get them to snap over the wire you may need 1or 2or 6 ..you can buy a shitton for 10 bucks |
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should probably update this thread. bought a variety of ferrite chokes on amazon. got 5 each of 4 different sizes. i have put 1 on each end of my power supply, my ethernet cable. and on my window AC unit i can now listen to my scanner while im using my desktop computer. im still getting a little static when turning on the computer. but im not worried about it. thanks for the suggestion of the ferrite chokes  |