HF GUANELLLA CURRENT BALUNS

TRUE GUANELLA CURRENT BALUNS:

MINNS DESIGN

NOTE THAT SOME MODELS ARE CUSTOM MADE

Current Balance: Unlike voltage baluns a true Guanella current balun forces equal and opposite currents into the balanced side. This helps stop RF from traveling back down the outside of your coax shield. Mini tuneable chokes can be inserted in each output line and balanced by using a Network analyser.

Dual-Core vs. Single-Core: Proper high-performance designs use two separate ferrite cores (one for each 100-ohm line) to prevent internal flux cancellation and common-mode radiation problems that happen with single-core compromises.

TRUE GUANELLA CURRENT BALUNS

THE FOLLOWING GUANELLA CURRENT BALUN UNITS (2/1: 2.5: 4/1:)

ARE SUPERB FOR DOUBLETS: LOOPS AND OSCD ANTENNAS

The “REAL” GUANELLA CURRENT BALUN

TECHNICAL INFORMATION

High or low power TRUE Guanella current baluns using 2, 4 or 6 cores. Superb matching.

The real and only way to make a Guanella Current Balun, split wound cores, if it uses a single core it is a voltage balun as it has one side directly connected to the rf socket earth connector. The Guanella current unit has 2 independent lines and can be fitted with tunable ferrite wound coils to balance the lines if required, the Guanella BALUN also offers substantial RF return choking attenuation which eliminates a 1/1 choke at the antenna feed-point. A 1/1 choke can still be fitted at the Transmitter feed-point which will reduce noise picked up by the feed line.

2/1 MINI GUANELLA CURRENT VERSIONS:

REMEMBER: IF A 2/1 IS BUILT ON A SINGLE CORE IT IS A “VOLTAGE” UNIT AND NOT A CURRENT UNIT

A unique GUANELLA dual side by side cores Ni/Zn special mix, custom made cores for optimum return loss, current balun. 50 > 100 ohms and designed from our superb range of GUANELLA baluns built to a very high standard. This unit is probably the only correct version ever manufactured, it uses the 2 or 4 or 6 cores to feed the lines correctly and does NOT use a single core for the 2 lines and then another core for a 1/1 unit (VOLTAGE UNITS). Depending on power requirements up to 6 cores are used along with up to 6 inter-woven windings which produces a good RL when terminated at 100 ohms over 2 to 30MHz (1.2 > 1.5 vswr max). Housed in a poly uv enclosure and resin potted for stability and protection, 2 stainless steel line/mount supports are fitted. Suitable for Doublets, OSCD, and Delta Loop antennas as a direct connection to the lines/loop. Available with BNC or SO239 socket.

The 2/1 100w Guanella Current Unit

The 400w 4 core PTFE 2/1 unit in a Hammond IP rated rubber gasket lid enclosure,

even the bolts have rubber “O” rings, resin potted, Marine A4 strain relief loops,

supplied with ss wire locks and thimbles. The ideal unit for the sky loop

2.5/1 MINI GUANELLA CURRENT VERSIONS:

REMEMBER: IF A 2.5/1 IS BUILT ON A SINGLE CORE IT IS A “VOLTAGE” UNIT AND NOT A CURRENT UNIT

A unique GUANELLA dual side by side cores (Ni/Zn/F14 special mix custom made cores for optimum return loss) current balun. 52 > 125 ohms and designed from our superb range of GUANELLA baluns (unbal coax to bal lines/loop) built to a very high standard. This unit is POSSIBLY the only correct version ever manufactured and was down scaled from the 200 ohm Guanella version, it uses the 2 cores to feed the lines correctly and does NOT use a single core for the 2 lines and then another core for a 1/1 unit (VOLTAGE UNITS). Depending on power requirements up to 6 cores are used along with up to 6 inter-woven windings which produces a good RL when terminated at 125 ohms over 2 to 30MHz (under 1.2 vswr sweep terminated test @ 125 ohms). Housed in a poly uv protected enclosure (Grey or Black) and resin potted, 2 stainless steel line/mount supports are fitted. Suitable for Doublets, OSCD, and Delta Loop antennas as a direct connection to the lines. Available with BNC or SO239 socket.

The 120 watt pep version uses dual cores wound with 4 PTFE wires feeding current where it should be.

A superb sweep matched at 52 > 125 ohms 125 watt

Below: Lockable line terminations fitted.

Below: Multi hole mounting BNC Versions of the 2.5/1 Guanella current Balun

TECHNICAL INFORMATION

Square loop BNC version below fitted with stainless steel mounting on the top of the unit for line strain relief

Below: SO239 versions resin potted

2.5/1 GUANELLA CURRENT 400w PEP VERSION:

REMEMBER: IF A 2.5/1 IS BUILT ON A SINGLE CORE IT IS A “VOLTAGE” UNIT AND NOT A CURRENT UNIT

A unique GUANELLA double stack side by side cores (4 x Ni/Zn/F14 special mix custom made cores for optimum return loss) current balun. 52 > 125 ohms and designed from our superb range of GUANELLA baluns (unbal coax to bal lines/loop) built to a very high standard. This unit is POSSIBLY the only correct version ever manufactured and was down scaled from the 200 ohm Minns multi-core Guanella current version, it uses 4 cores to feed the lines correctly and does NOT use a single core for the 2 lines and then another core for a 1/1 unit (VOLTAGE UNITS). 4 cores are used along with 4 inter-woven windings which produces a good Return Loss value when terminated at 125 ohms over 3 to 30MHz (1.2/1). Housed in a Hammond ABS uv protected black or grey uv enclosure and resin potted, 2 A4 stainless steel line/side mount supports are fitted plus a top mounting loop. SO239 socket. Lockable line connectors. Suitable for Doublets, OSCD, and Delta Loop/Square Loop antennas with a direct connection to the lines.

400w pep ICAS 4 core 2.5/1