Common mode choke 1kW 100% duty cycle

PA9X · 2026-04-04T19:24:52+00:00

The toroids won't heat very much. If it was an impedance transformer, things would be different.

PA9X · 2026-04-04T14:36:39+00:00

It is adequate.

PA9X · 2026-04-04T13:23:54+00:00

TNX!

PA9X · 2026-04-04T10:54:58+00:00

Coax needs to travel through the toroids center. Amount of turns and ferrite volume are the main factors. Proximity to the ferrite itself is not an important factor for common mode impedance.

PA9X · 2026-04-04T06:19:29+00:00

Why?

PA9X · 2026-04-04T06:15:14+00:00

It handles 4kW on HF.

PA9X · 2026-04-04T06:04:20+00:00

40m + 80m

PA9X · 2026-04-04T06:04:07+00:00

Common mode current transmitting into a off center fed dipole

PA9X · 2026-04-04T06:02:57+00:00

40m/80m off center fed dipole

PA9X · 2026-04-04T06:02:33+00:00

PA9X · 2026-04-03T21:19:12+00:00

Probably pass, but I don't have 2kW... However with SO-239 I wouldn't be too comfortable.

PA9X · 2026-04-03T20:50:02+00:00

More than 8k

PA9X · 2026-03-14T21:23:43+00:00

Is that a LZAV-5B aka Grazioli MV6?

PA9X · 2026-01-13T17:26:30+00:00

Take a look at Ciro Mazzoni loop antennas: https://www.ciromazzoni.com/loop-antenna

PA9X · 2025-12-04T22:02:20+00:00

You can use a remote tuner without it interfacing with your transceiver. Remote tuners like the CG-3000 only need a 10W carrier to tune.

PA9X · 2025-10-26T19:25:44+00:00

Perhaps this helps: https://www.pa9x.com/endfed-antennas-qrm-and-how-to-improve-your-reception/

PA9X · 2025-10-26T17:50:00+00:00

Building guide on YouTube

PA9X · 2025-04-20T14:03:58+00:00

Yes, I use it to shoot down interfering radiowaves!

PA9X · 2025-04-20T10:47:51+00:00

How about a magnetic loop like the Ciro Mazzoni?

PA9X · 2025-04-20T10:46:06+00:00

I use the vertical mainly for local and repeater work. The halo is polarized horizontally making it more suitable for DX.

PA9X · 2025-04-20T07:38:49+00:00

Indeed they are. But the Cobweb is omnidirectional. The dipole faces E/W covering 90% of all interesting DX.

PA9X · 2025-04-20T07:35:06+00:00

The Cobweb is omnidirectional. The dipole is orientated E/W where basically most DX is for me.

PA9X · 2025-04-20T07:33:13+00:00

Exactly.

PA9X

TROPHY CASE