Coax Feed Line Common Mode Chokes
1:1 Balun Kits & Feed-Line Chokes
Tame common-mode current, lower the noise floor, and keep your coax from “radiating along for the ride.” Choose a **feed-point 1:1 balun** for the antenna, a **jumper choke** for quick installs at the feed or radio end, or a **specialty choke** tuned for loops, OCF, and end-fed antennas.
Quick chooser
| Use case | Best choice | Why |
|---|---|---|
| Stop coax from radiating at the antenna feed point | Feed-Point 1:1 Balun | Keeps TX current on the antenna legs, not on the braid |
| Quick drop-in at radio end or station entry | Jumper Choke | Plug-and-play braid noise filter; easy install |
| Loop, OCF, EFHW needs extra isolation | Specialty Choke | Band-range optimized choking for those antenna types |
Jumper Chokes
RG-8X and RG-213/LMR-400 jumper-style chokes. Ideal at feed point or radio end.
HF 1.8–65 MHz 1.5 kW / 5 kW
Feed-Point 1:1 Baluns
High-impedance choking where it matters most: right under the antenna.
1:1 Baluns SSB PEP 500 W–5 kW
Specialty Chokes (Loop / OCF / EFHW)
DIY Ferrite Kits.
Optimized Ranges 1.5 kW / 5 kW
60-second “Do I need a choke?” test
- Unplug your feed line; note baseline noise.
- Touch center pin only to the jack → note noise.
- Touch shell only. If noise jumps, that’s braid-borne common-mode → add a choke.
Power rating & duty cycle
Pick a PEP rating that matches your station (e.g., 500 W, 1.5 kW, 5 kW). Ratings assume typical SSB/ICAS duty. For long key-down or high-duty digital, reduce average power or step up a rating.
© Palomar Engineers®
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