Toroid cores

Toroid core for high power baluns TX 58/41/18 - 4C65 - NEW-
This "european" core made by Ferroxcube can be used as a replacement type for the popular FT240-61. The beige expoxy coating is the "highlight" of the core, as most competitors have only "bare" surface. This core is good for voltage and current baluns from 160 - 6m with a power range of about 500 - 2000 watts, depending on application. This core is not in the regular ferroxcube programm and is a special order, which is manufactured for our company.
Specifications: OD 58mm, ID 41mm, Height 18mm, beige expoxy coating, AL = 160 (nH), Permeability 125, weight 110g;
Price: 16,00 euro each ; 4 or more 15,00 euro each

Toroid core for medium power baluns TX 36/23/15 - 4C65
Ni-Zn Ferrite, excellent properties in the HF frequency range (8-10 turns), flash-resistant coating (epoxy), colour beige, 2000V insulation. 36mm outer diameter, 23mm inner diameter, 15mm high, weight 42g, Permeability 125, AL = 170 (nH), for compact baluns. Suitable for 100 to 500 Watt, depending on application.
Price: Single units: 6.90 euro - 4 or more 6.50 euro - 10 or more 6.20 euro

Toroid core for medium power baluns T39/23/15 - 250
This core has a very rare permeabitlity of 250. Therefore is has a very good
performance on the low bands (160 -30m), where sometimes the permeabilty
of the 4C65 or -61 cores is a bit low.
OD 39mm, ID 23mm, H 15mm, Permeability 250, AL = 350 (nH), colour green,
weight 50g
Price: Single units: 4.90 euro - 4 or more 4.50 euro - 10 or more 4.00 euro

Toroids for preventing BCI/TVI T36/23/15-3S4 Ferroxcube
This is one of best EMI cores, I have ever seen. Excellent wide band
performance from 160m up to 70cm and a high permability of 1700,
OD 36mm, ID 23mm, H 15mm
Price: Single units: 2.40 euro - 10 or more 2.20 euro

Toroids for preventing BCI/TVI - CST 29/19/7.5 - 4S2 Ferroxcube
these toroids were developed as "cable shields". The rounded edges make them very suitable for use in preventing TVI/BCI/LFD in all sorts of equipment. This particular ferrite mix consists of a nickel-zinc material with a permeability of 850. The internal diameter of 19mm allows for a large amount of wire to be wound onto the core. These cores are particularly suited for making chokes to be used with transmitting apparatus and computers (power supplies, accessories, modems, computer peripheral cables &c) to prevent interference. They are also very suitable for use in immunising TVs, video recorders, stereo sets and telephone equipment. It is easy to wind six turns of 5mm diameter 75_Ohm TV coax on one of these cores without removing the moulded-on plug. These cores are also excellent for use in immunising telephone systems. Because of their low profile they can be hidden away inside most telephone wall-sockets.
Important: ALWAYS use as many turns as possible. A doubling of the number of turns results in a quadrupling of the blocking impedance. Specifications: OD 29mm - ID 19mm - Height 7.5mm
Impedance (1 turn): 25MHz - 28 Ohm; 100MHz - 47 Ohm (manufacturers data), effective to approx. 1 GHz (Maximum attenuation at approx. 200 MHz)
Practical measured impedance: (5 turns, measured on an AEA CIA-HF )
1.8MHz - 139 Ohm; 3.6MHz - 252 Ohm; 7.0MHz - 381 Ohm; 14.0MHz -602 Ohm; 21.0 MHz - 656 Ohm; 28.0 MHz - 573 Ohm
Price: 1.10 euro each; 10 or more 1.00 euro each.

Ferrite tubes for HF chokes on 5mm coax cable CST 9,5/5.1/15 - 3S4
Ferroxcube's 3S4 manganese-zinc ferrite has exceptional wide-band properties (up to 1GHz) compared to nickel-zinc mixes. Threading 10 to 30 of these tubes onto 5mm coax (or even better, on Teflon coax) results in an efficient HF choke that comes into its own during contesting with multiple stations that need to be decoupled from one another. Another use for these HF chokes is the immunisation of radio communications systems, be they for transmitting, receiving, or both.
Specifications: OD 9.5mm - ID 5.1mm - Length 15mm
Permeability: 1700
Impedance: 25MHz - 66 Ohm; 100MHz 110 Ohm (manufacturers data)
Practical impedance value (20 cores measured on the screen of a length of RG58 coax using an AEA CIA-HF Analyzer):
1.8 MHz - 722 Ohm; 3.6MHz - 985 Ohm; 7.0 MHz - 1000+ Ohm,
14.0 MHz - 934 Ohm; 21.0 MHz - 647 Ohm; 28.0 MHz - 501 Ohm
(A graph can be seen on the "HF chokes" page)
Price: 0.50 euro each; 10-50 = 0.45 euro each, more than 50 = 0.40 euro each, more than 250 = 0,35 euro each

Ferrite tubes for HF chokes on 7mm coax cable (Aircell) CST 16/7,9/14- 4S2
Suitable for use as HF chokes on 7mm coax - eg Aircell 7
Specifications: OD 16.25mm - ID 7.9mm - Length 14.3mm !
Permeability: 850
Impedance: 25 MHz - 70 Ohm; 100 MHz - 113 Ohm (manufacturers data)
Practical impedance value: not yet measured
Price: 0.90 euro each, 10-50 = 0.85 euro each, more than 50 = 0.80 euro each


Ferrite beads for HF chokes on 10,3mm Kabel CST 19/11/12 - 3S4
Suitable for use as HF chokes using 10.3mm coax (eg RG213) and on rotator control cable.
Specifications: OD 19mm - ID 10.6mm - Length 11.5 mm
Permeability: 1700
Impedance: 25 MHz - 50 Ohm; 100 MHz - 75 Ohm (manufaturers data)
Praktical impedance value: see "HF chokes".
Price: 0.85 euro each, 10-50 = 0.80 euro each, more than 50 = 0.75 euro each, more than 100=0.70 euro each

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