Weather Station Hardware > Blitzortung
Radio Interference Issue
Silversword:
Hi All,
I am a amateur radio operator and when I use my HF radio on 40 meters my receiving signal has a lot of noise that I cannot receive weaker stations. When I turn off my BT system the noise goes away and I am able to receive those weaker station.
Is there a way to eliminate the interference coming from my BT system?
Any recommendations or suggestions will be greatly appreciated.
Aloha,
--Stan Y.
KH6HHG
Maui, Hawaii
W0BTU:
Could it be coming from a switching power supply that powers it?
Silversword:
--- Quote from: W0BTU on April 21, 2021, 03:54:09 PM ---Could it be coming from a switching power supply that powers it?
--- End quote ---
Hi,
Thanks for the possible culprit. When I unplug the connector to the BT (Red) system the interference goes away and the power supply (wall wart) is still plugged in. I also have ferrite beads on the cable for all inputs to the system.
--Stan Y.
KH6HHG
Maui, Hawaii
W0BTU:
Is this a System Red? I've never owned one, but it seems I've read that the display can cause RFI. Can you turn it off?
Maybe a shielded cable has lost its ground, and it's radiating the noise? I suggest that you disconnect one cable at a time. If unplugging one of them makes the noise vanish, then that cable is suspect.
What kind of 40m antenna? Perhaps the coax shield is picking up noise near the receiver, especially if it's feeding a balanced antenna without an effective balun. An end-fed wire running all the way to your transceiver is notorious for picking up noise.
Is your choice of ferrite choke the right mix for suppressing 40 meter RF?
This is all I can come up with right now. I've never had my System Blues affect any ham band here. But I certainly believe you. Please keep us posted! :)
Silversword:
--- Quote from: W0BTU on April 21, 2021, 06:35:31 PM ---Is this a System Red? I've never owned one, but it seems I've read that the display can cause RFI. Can you turn it off?
Maybe a shielded cable has lost its ground, and it's radiating the noise? I suggest that you disconnect one cable at a time. If unplugging one of them makes the noise vanish, then that cable is suspect.
What kind of 40m antenna? Perhaps the coax shield is picking up noise near the receiver, especially if it's feeding a balanced antenna without an effective balun. An end-fed wire running all the way to your transceiver is notorious for picking up noise.
Is your choice of ferrite choke the right mix for suppressing 40 meter RF?
This is all I can come up with right now. I've never had my System Blues affect any ham band here. But I certainly believe you. Please keep us posted! :)
--- End quote ---
Hi,
Thanks for your suggestions and recommendations. Will try to isolate it via removal of cables first.
The display goes off after about 30 seconds after it comes on from time to time. When it is off the interference is still there with it on or off. Don't know if the display is working in the background when it is in the off mode.
The 40 meter antenna is a full length dipole with a 1:1 balun.
I do have about a s5 noise level at my location. With the BT system my noise level goes up to s7 and sometimes it pulses when the red blinking LED is blinking.
I don't know what type of ferrite beads are, but it did some good to reduce the noise just a hair.
Maybe I should retire my Red system for a Blue one. Might have to do the H and E fields system as well. Big changes to do all that.
Aloha,
--Stan Y.
KH6HHG
Maui, Hawaii
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