These chokes are as good or better than most anything on the market and much cheaper! Most commercial units use tiny ferrite sleeves or beads crammed into a PVC pipe. These have higher impedance and can handle outdoor use.
Fair-Rite part number 2631803802
For RG8x or RG8M keep power under 500 watts. This assumes a 1:1 SWR. For higher power or high SWR use RG-400 coax. See link:
rover.ebay.com...
If you use RG-400 you will have room to slide a piece of 3/4" or 1/2" PVC tubing through the center to devise a means of support however the core / coax assembly is fairly strong anyway.
You can put 2, 3 or 4 of these in series for an insane total of choking resistance. Just leave 6" or so between them and use a longer section of coax. If you want a minimum of connectors just use one long coax from the shack to the antenna and wrap a few of these along the path!
Use the same cores for AC cords, DC, cords, Speaker cable, Mic. cable, rotator cable ....You name it.
BTW: Don't waste your time on a so called "ugly balun" or coax just wrapped around a pvc pipe. They have almost zero inductance! If one actually seems to work it's probably because you added coax length and move the radiation to another spot :*)
Good Read RFI and Choke building k9yc.com/RFI-Ha...
Have fun building 73 N4LQ
Негізгі бет Build Simple Effective Common Mode Choke (CMC) aka. Line Choke for RFI
Пікірлер: 102