Universal 1-1 Common Mode Choke 5000W Balun for Upper Bands

Triple core Universal 1-1 Common Mode Choke 5000W Balun for upper bands, including 40m to 10m. For Yagi antennas, dipoles, and vertical. High common-mode impedance and extreme power rating are the key features. This balun could easily handle any linear amplifier with a single or two FU728F, GU84, GS35B, or MRF1K5, BLF188, ART1K6, ART1K9, ART2K5.

Why use a Common Mode Choke – Current Balun?

In transmitting antenna systems, common-mode currents can negatively impact antenna efficiency, reduce gain, distort the antenna pattern, and increase local radio frequency interference (RFI).

In receiving systems, common-mode currents may raise the noise floor, distort audio signals, cause computer crashes, or potentially result in RF burns.

A high-quality common-mode choke or current balun features high common-mode impedance. This high impedance helps to minimize unwanted currents to nearly undetectable levels. A general guideline suggests aiming for a common mode impedance of 500 Ohms or higher for 50 Ohm transmission lines.

This high-band TRIPLE core balun is exactly what you need to increase antenna efficiency and clean antenna pattern.  Balun uses 7mm Teflon SF250 cable (not RG142 5mm cable) to withstand high power and tolerate SWR.

 

Universal 1-1 Common Mode Choke 5000W Balun for 40m, 30m, 20m, 17m, 15m, 12m, 10m Appearance:

 

 

Use this Upper bands Universal 1-1 Common Mode Choke 5000W Balun with any antenna to:

• Increase antenna efficiency
• Increase antenna gain
• Clean antenna pattern
• Lower RFI
• Lower receive noise

 

Universal 1-1 Common Mode Choke 5000W Balun for High Bands could be produced in two versions:

• SKU: 2983 Universal 1-1 Common Mode Choke 5000W Balun for Upper Bands CB5000W3CS. SO239 Silver Plated Teflon connector (-15 EUR)
• SKU: 2984 Universal 1-1 Common Mode Choke 5000W Balun for Upper Bands CB5000W3C7 7/16 DIN connector (this one)
• By order with Plain Brass Hex Nuts or Wing Nuts (no price change)

 

Measured common mode impedance of High Band Universal 1:1 5000W Common Mode Choke

5MHz 520Ω
7.1MHz 815Ω
10.1MHz 1.6kΩ
14.1MHz 6.7kΩ
18.1MHz 5.7kΩ
21.2MHz 2.5kΩ
24.9MHz 1.8kΩ
28.4MHz 1.2kΩ
50MHz 450Ω

Maximum power input at SWR:
1:1 = 5000 W; 1:1.5 = 3350 W; 1:2 = 2500 W; 1:3 = 1650 W

Produced with 3 pieces of the best ferrite cores

 

High Bands Universal 1:1 Common Mode Choke 5000W Balun Triple Appearance:

 

The other Common-Mode Chokes – baluns are here.

 

Customer questions:

Q1: Some antenna manufacturers claim that their antenna does not need a balun or “works very well without a balun“. Is it true?
A: If they can prove the non-existence of common-mode currents, that would be fine. However, this is impossible to prove on any HF or VHF antenna.

Q1: Which antennas need a balun?
A: All dipoles, all Yagis, Quad antennas, and Vertical (GP) antennas. No exception.

Q3: But almost all Quad antenna producers claim that a Quad antenna does not need a balun. Is it true?1
A: Please read Q1 and Q2.

Q4: But I have a perfect 1:1 SWR on the antenna without a balun? Is it good?
A: YT1NT Quote: Without a balun, some of the transmitter power is lost. The resonance of the antenna is masked and distorted; what is actually measured is the resonance of the entire system, in which the shield of the coaxial cable functions as part of the antenna. The resonance of that system does not have to have anything to do with the resonance of the antenna itself, ie, the fact that we set the resonance of the system does not mean that the antenna is anywhere close to resonance, which can cause large losses. This will lead to a weaker signal and a worse ranking in competitions.

Q5: I purchased a balun from a ham radio vendor, but it didn’t come with any common-mode impedance data. Is the balun good?
A: It could be, but that’s not guaranteed. The fact that the balun is available for purchase doesn’t necessarily mean it’s good. What truly matters is whether the common-mode impedance data has been measured at the frequencies of your interest. If you don’t have that information, you may have a problem. Or it might be unclear what you’ve actually bought.