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+---- Thread: RF Chokes for RFI Suppression (/showthread.php?tid=1322)
RF Chokes for RFI Suppression - VA3-GUF-Frank - 2024-11-12
To all,
The presentation I gave is too big to attache or upload on the forum so the following will be a synopsis of the details from the 11 slides presented.
DIGITAL NOISE SOURCES
LED Lights LED Displays / TV’s
USB Power supply chargers Laptop Power cord
Hydro Smart Meters 12VDC power supply
Battery Chargers Car 120VAC inverter
Solar Controllers
Typical recommendations at the antenna
10cm /4in. PVC wrapped in Coax band specific
160m 28 turns
80m 24 turns
40m 14 turns
20m 8 turns
15m 5 turns
10m 4 turns
This presentation will focus on the use of Snap on MIX-31 Ferrite of 0.25 inch inner diameter and 0.50 inch inner diameter.
Radio Station without and with Random wire Tuner
Add Mix-31 Ferrite 0.25 inch (Straight pass)
* 1 Ferrite @ Transceiver for installed External Speaker
* 1 Ferrite @ Transceiver for Remote Head
* 1 Ferrite @ Transceiver for Antenna without tuner
Add Mix-31 Ferrite 0.50 inch Looped @ transceiver & @ Tuner
* 2 x 5 looped Ferrite on Coax = 10 total
* 2 x 1 looped Ferrite on Control cable = 2 total
Total Ferrite
0-3 Mix-31 0.25 in. ID
12 Mix-31 0.50 in. ID
Radio set up for Digital modes
Same as Radio Station with or without tuner
Add MIX-31 Ferrite 0.05 inch Looped
MIX-31 for each PC cable;
* 1 Ferrite @ TNC/modem & 1 @ Computer
MIX-31 for each Radio cable;
* 1 Ferrite @ TNC/Modem & 1 @ Radio
Total Ferrite
Radio Station with or without Tuner set-up requirements
4+ MIX-31 0.50 in. ID
Dependent on your radio station set-up, anywhere from a few to as many as more than 19 Ferrite may be used.
Diagrams for the placement of the ferrite can be found also in the 2 attached files showing radio station set-up cabling.
Should anyone have questions on any of the above I can be reached at va3-guf@outlook.com.
Cheers
Frank
VA3-GUF / VE0-GUF / VE0-VET