Balun Specifications and Applications

Model B1-200 B1-2K Plus B1-4K Ultra B1-5K Plus Y1-5K Plus Yagi Choke Balun
Type Current Current Current Current Current Current
Ratio 1:1 1:1 1:1 1:1 1:1 1:1
Bandwidth 160 - 10 m 80 - 6 m 160 - 10 m 160 - 6 m 160 - 6 m 20 - 6 m
Coefficient of Coupling 100 % 100% 100% 100% 100% 100%
Power Loss in dB Nil Nil Nil Nil Nil Nil
Saturation resistant core? Yes Yes Yes Yes Yes Yes
Internal transmission line Z 50 Ohms 50 Ohms 50 Ohms 50 Ohms 50 Ohms 50 Ohms
Core type Ferrite Ferrite Ferrite Ferrite Ferrite Ferrite
L-C compensation? No No No No No No
Power Rating @ 3.5 MHz 200 W 1.5 kW 4 kW 5 kW 5 kW 20 - 10 meters = 1.5 kW
6 meters = 500 watts
Output Balance Excellent Excellent Excellent Excellent Excellent Very Good
Load variation tolerance Excellent Excellent Excellent Excellent Excellent Excellent
Input connector SO-239 SO-239 SO-239 SO-239 SO-239 SO-239
Output connector Wire Wire Wire Wire Wire Wire
Eye-bolts for wire attachment? Yes Yes Yes Yes 1 on top 1 on top
Physical Size 1.5" x 4.8" 2.3" x 8" 2.3" x 8" 2.3" x 8" 2.3" x 8" 2.3" x 8"
Weight 6 oz. 14 oz. 16 oz. 16 oz. 16 oz. 10 oz.

Applications

Dipoles, trap dipoles, Inverted-V, Slopers, etc. Applications requiring a 1:1 balun Dipoles, trap dipoles, Inverted-V, Slopers, etc. Applications requiring a 1:1 balun High power, high isolation version of the B1-2K Plus. High power version of the B1-2K. Any precision 50-ohm application requiring output wires at the top. This includes Yagis and other beams, as well as interface application between coax and ladder (i.e. G5RV) Any 20-6 meter application where a coil of coax type choke balun is used.

Power rating is based on a SSB or CW duty-cycle with an SWR of 3:1 or less at the output of the balun. Eye-bolts are stainless-steel and are not internally connected. Specifications are subject to change without notice.


Model B4-100 B4-1.5K B4-2K B4-2KX RemoteBalun™
Type Voltage Voltage Voltage Current Current
Ratio 4:1 4:1 4:1 4:1 4:1
Bandwidth 80 - 10 m 80 - 10 m 80 - 10 m 160 - 10 m 160 - 10 m
Coefficient of Coupling 99% 99% 99% 99+% 99+%
Power Loss in dB <0.5 <0.8 <0.7 <0.8 <0.9
Saturation resistant core? Excellent Excellent Moderate Excellent Excellent
Internal transmission line Z Two 100 ohm lines > 40 Ohms > 40 Ohms Two 100 ohm lines No Spec
Core type Ferrite Ferrite Ferrite Ferrite x 2 Ferrite x 2
L-C compensation? Yes Yes Yes Yes Yes
Power Rating @ 3.5 MHz 100 W 1.5 kW > 1.5 kW >> 1.5 kW >1.5 kW Depends on load impedancel. With higher than a moderate impedance load or with a higthly reactive load, the power rating may have to be reduced.
Output Balance Excellent Good Good Excellent Excellent
Load variation tolerance Very Good Good Good Excellent Excellent
Input connector SO-239 SO-239 SO-239 SO-239 SO-239
Output connector Wire Wire Wire Wire Wire
Eye-bolts for wire attachment? Yes Yes Yes Yes Yes
Physical Size 1.4" x 2.7" 2.3" x 8" 3.5" x 3.5" 3.5" x 3.5" 3.5" x 3.5"
Weight 4 oz. 12 oz. 12 oz. 14 oz. 15 oz.
Applications Any application requiring a 4:1 balun feeding 200-300 ohm loads. Folded dipole Delta-loops or any 200 - 300 ohm application. B4-1.5K applications.
KT-34XA beam
All loop applications
B4-2K applications.
Current-type design is more tolerant of load variations.
Open-wire to coax interface external to operating position. Use with tuner.

Power rating is based on a SSB or CW duty-cycle with an SWR of 3:1 or less at the output of the balun. The RemoteBalun™ is an exception. Eye-bolts are stainless-steel and are not internally connected. Specifications are subject to change without notice.

Important: Not rated for AM, RTTY or other high duty-cycle modes. Power rating is for normal SSB and CW duty-cycles only.
Exception: At transceiver output levels, baluns rated at 1500 watts may be used on PSK-31 and similar modes without reducing your transceiver's IMD level on digital modes.

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