Mantelwellensperre / RFI-Choke 1KW Version Diese Mantelwellensperre vermeidet, dass die Abschirmung des Koaxialkabels nicht Teil des Antennensystems wird und ungewollt abstrahlt. Darüberhinaus dient sie der Anpassung des unsymmetrischen Koaxkabels an symmetrische Antennen und kann daher auch als "1:1" Balun verwendet werden. Durch den Aufbau nach dem W2DU Prinzip, ist die Mantelwellensperre 1KW extrem breitbandig und verlustarm. Eine Vielzahl von hochpermeablen Ferriten werden auf hochtemperaturfestes PTFE Koaxkabel gefädelt, eingeschrumpft und entsprechende Stecker montiert. Somit lässt sie sich leicht in die Koaxzuleitung integrieren. Die Mantelwellensperre 1KW ist ca 45cm lang, sehr breitbandig und verfügt über ca. 1000 Ohm Sperrdämfung im Frequenzbereich von 160m - 2m. Sie ist wetterfest eingeschrumpft und hat 2 hochwertige PL259 Stecker mit PTFE-Dialektrikum und Goldkontakt an den Enden. Ein PL258 Verbinder auch mt PTFE und Goldkontakt ist im Lieferumfang enthalten. WICHTIG! Platzieren Sie die Mantelwellensperre 1KW im Falle einer End Fed-Antenne nicht direkt am Speisepunkt der Antenne!Zwischen dem Transformer der End Fed und der Mantelwellensperren sollte ein Koaxkabel mit einer Länge von >= λ 0,05 (bei 80m etwa 4,20m) eingefügt werden.  

Mantelwellensperre / RFI-Choke 2KW Version Diese Mantelwellensperre vermeidet, dass die Abschirmung des Koaxialkabels nicht Teil des Antennensystems wird und ungewollt abstrahlt. Darüberhinaus dient sie der Anpassung des unsymmetrischen Koaxkabels an symmetrische Antennen und kann daher auch als "1:1" Balun verwendet werden. Durch den Aufbau nach dem W2DU Prinzip, ist die Mantelwellensperre 2KW extrem breitbandig und verlustarm. Eine Vielzahl von hochpermeablen Ferrithülsen (28 Stück)  werden auf hochtemperaturfestes PTFE Koaxkabel gefädelt, eingeschrumpft und entsprechende Stecker montiert. Somit lässt sie sich leicht in die Koaxzuleitung integrieren. Die Mantelwellensperre 2KW ist ca 70cm lang, sehr breitbandig und verfügt über ca. 1500 Ohm Sperrdämfung im Frequenzbereich von 160m - 2m. Sie ist wetterfest eingeschrumpft und hat 2 hochwertige PL259 Stecker mit PTFE-Dialektrikum und Goldkontakt an den Enden. Ein PL258 Verbinder auch mt PTFE und Goldkontakt ist im Lieferumfang enthalten. WICHTIG! Platzieren Sie die Mantelwellensperre 2KW im Falle einer End Fed-Antenne nicht direkt am Speisepunkt der Antenne!Zwischen dem Transformer der End Fed und der Mantelwellensperren sollte ein Koaxkabel mit einer Länge von >= λ 0,05 (bei 80m etwa 4,20m) eingefügt werden.  

This pre-assembled coaxial cable with integrated RFI choke for End Fed antennas is ready for immediate use. Thanks to its design based on the W2DU principle, the common mode choke is extremely broadband and low-loss. It effectively prevents the shielding of the coaxial cable from becoming part of the antenna system and radiating unintentionally. It therefore provides effective protection against unwanted RF interference. It also serves to adapt the unbalanced coaxial cable to balanced antennas and can therefore also be used as a “1:1” balun. A variety of highly permeable ferrites are threaded onto lightweight HF-195 FX-ZH low-loss coaxial cable, shrink-wrapped and assembled with connectors as required. The integrated RFI choke (common mode choke) is installed at the end of the cable after 2.10m for the 10-40m bands or after 4.20m for the 10-80m bands. We offer lengths of 10, 15 and 20m. Other lengths can be produced on request. The lightweight coaxial cable with integrated RFI choke (common mode choke) is also ideal for portable use when traveling, QRP, COTA, POTA, IOTA, SOTA (Summit on the Air) or DX expeditions. 50 Ohm HF195 FX-ZH coaxial cableReady for immediate usefor 10-40m or 10-80m bandPlug and PlayChoice of cable lengthConnector of your choicePower limit Max: 250W PEP SSB Translated with DeepL.com (free version)

This pre-assembled coaxial cable with integrated RFI choke for QRP is ready for immediate use. Thanks to its design based on the W2DU principle, the common mode choke is extremely broadband and low-loss. It effectively prevents the shielding of the coaxial cable from becoming part of the antenna system and radiating unintentionally. It therefore provides effective protection against unwanted RF interference. It also serves to adapt the unbalanced coaxial cable to balanced antennas and can therefore also be used as a “1:1” balun. A variety of highly permeable ferrites are threaded onto lightweight RG316 low-loss coaxial cable, shrink-wrapped and assembled with connectors as required. The integrated RFI choke (common mode choke) is installed at the end of the cable after 30cm. We offer lengths of 5,20m, 7,70m and 10,20m. Other lengths can be produced on request. The lightweight coaxial cable with integrated RFI choke (common mode choke) is also ideal for portable use when traveling, QRP, COTA, POTA, IOTA, SOTA (Summit on the Air) or DX expeditions. 50 Ohm high Quality RG316 coaxial cableReady for immediate usePlug and PlayBNC Connector with PTFEChoice of cable lengthPower limit Max: 100W PEP SSB

Our (W2DU) Feedline Chokes are built strictly from premium quality material.The PL-259 UHF coax connectors, double-UHF female connector and coax cable are sourced from our long time German suppliers and are well proven.The ferrite cylindrical cores are sourced directly from the manufacturer.You should plan about 1 hour of work-time for the construction of the RF Choke. You will need a soldering iron and solder, a heat gun (lighter if necessary) and scissors or cutting tool to strip the cable.These broadband RF Chokes have about 1000 Ohm Common Mode Impedance from 160 - 6m.The kit contains the following material for building the RF Choke:50 cm coax cable RG-14250 cm heat shrink tubing 9/3mm2x PL-259 connectorPL double female connector)12x ferrite cores (cylindrical) CST9.5/5.1/15-3S46x ferrites cores (cylindrical) LFB095051-000Download the illustrated assembly instruction as PDF here Hersteller: Nach EU 2023/988 Produktsicherheitsverordnung (GPSR) Spiderbeam GmbH Geschäftsführer: Dipl.-Ing. Cornelius Paul Otto-von-Guericke-Str. 3 03130 Spremberg Deutschland Tel: +49 3563 989812 Fax: +49 3563 989812 E-Mail: office@spiderbeam.com Verantwortliche Person: Spiderbeam GmbH Geschäftsführer: Dipl.-Ing. Cornelius Paul Otto-von-Guericke-Str. 3 03130 Spremberg Deutschland Tel: +49 3563 989812 Fax: +49 3563 989812 E-Mail: office@spiderbeam.com

CCMC30 Common Mode Noise Filter Noise filters are nothing new and are often used for transmitting purposes. They are used to prevent unwanted radiation via the coax shielding. It is less known that they can also suppress unwanted radiation when receiving signals, especially when an active antenna is used. However, in this case, the situation is reversed: en route to the antenna, unwanted interferences from electric home appliances can be effectively eliminated. NTi's Coaxial Common Mode Noise Filter (CCMC30) has been especially optimized for maximum common mode noise rejection of >30dB wide band in the frequency range of 150kHz - 30MHz. With slight limitations a much wider frequency range is covered. In the medium wave range for example a noise suppression of up to 45 dB can be achieved. This is possible by using a cascaded system of ferrite cores with various frequency dependent material properties, combined with high quality coaxial cable. For outdoor use, the system is housed in a water-proof enclosure. We recommend to connect the CCMC30 as closely as possible to the receiver.With regard to efficient noise suppression, the CCMC 30 is not very much different from the galvanic isolator GI1000. However, the CCMC30 performes down to lowest frequencies including DC voltage, in contrast to the GI1000, which blocks DC voltages and very low frequencies. The CCMC30 can thus be connected directly to the coax cable which passes the supply voltage or the control signals to the active antenna. A series connection of the GI1000 directly connected to the receiver followed by the CCMC30 right behind the power inserter may result in an even better performance. Technical Data Guaranteed frequency range: 150 kHz – 30 MHz Common Mode Wave suppression: >30 dB: 150 kHz -30MHz (>20 dB: 30kHz-60MHz) Insertion loss: <1 dB (up to max. 150 MHz) Size: 100x68x50mm (132mm with BNC connectors) Connectors: 2x BNC 50Ohms Weight: 320g Made in Germany

1 – 30 MHz Common mode filter with bifilaire windings for optimal attenuation There are many types of common mode chokes available, HF Kits opts for a common mode choke with bifilar windings for optimal filtering. This 1 – 30 MHz common mode current filter is optimized for the 80 and 160 meter band. In this case a FT240-31 toroidal core with optimal performance for the lower frequency range is used. The 1 – 30 MHz common mode choke performs very well on the entire HF spectrum. The attenuation is therefore around 30 dB across the entire HF frequency spectrum. This filter is therefore a real all-rounder for amateurs who want to work from 160 meters to 10 meters. Even people who deal with LPAM (Medium Wave) can use this filter. The main reason for using a common mode choke is to ensure that the coax cable’s shield does not become part of the antenna system and will radiate unintentionally. This has all sorts of nasty effects, think of: interference issues, disrupted radiation pattern of the antenna and a higher noise level. This last point is because not only does the coax cable’s shield radiate when you transmit, but the shield also works as a receiving antenna. Because the coax cable often makes a considerable trip within the house, close to interference sources (mains, PLC etc…) It is useful to eliminate these sources of interference. Any way, Good reason to use a common mode choke. The effect of this common mode choke with bifilar windings is difficult to predict. This depends on local circumstances. Think of: antenna type, antenna placement, type of feed line, feed line placement and especially local sources of interference. There are manufacturers that promise in advance a significant drop in interference, however this is not real. There are cases where the noise level decreases by two to three S points, but also cases where the filter has almost no effect. This kit includes: IP65 enclosure 100 x 100 x 55 mm (Polycarbonat) Ringcore Amidon FT240-31 Winding wire 18 AWG – 4x 85cm PTFE 19 x 0.25 mm copper “Silver plated” Toroid mounting plate Stainless steel M3 6mm screws 4x Stainless steel M3 Spring washer 4x 2x PL 259 Chassis 2x M3 cable lug 8x Stainless steel M3 Bolt 12mm 8x Stainless Steel M3 Nut 8x Stainless steel M3 washer 8x Stainless steel M3 tooth washer IMPORTANT! Do not place the common mode choke in case of an End Fed antenna directly at feed point of the antenna.Construction Manual in Englisch

1 – 30 MHz Common mode filter with bifilaire windings for optimal attenuation There are many types of common mode chokes available, HF Kits opts for a common mode choke with bifilar windings for optimal filtering. This 1 – 30 MHz common mode current filter is optimized for the 80 and 160 meter band. In this case a FT240-31 toroidal core with optimal performance for the lower frequency range is used. The 1 – 30 MHz common mode choke performs very well on the entire HF spectrum. The attenuation is therefore around 30 dB across the entire HF frequency spectrum. This filter is therefore a real all-rounder for amateurs who want to work from 160 meters to 10 meters. Even people who deal with LPAM (Medium Wave) can use this filter. The main reason for using a common mode choke is to ensure that the coax cable’s shield does not become part of the antenna system and will radiate unintentionally. This has all sorts of nasty effects, think of: interference issues, disrupted radiation pattern of the antenna and a higher noise level. This last point is because not only does the coax cable’s shield radiate when you transmit, but the shield also works as a receiving antenna. Because the coax cable often makes a considerable trip within the house, close to interference sources (mains, PLC etc…) It is useful to eliminate these sources of interference. Any way, Good reason to use a common mode choke. The effect of this common mode choke with bifilar windings is difficult to predict. This depends on local circumstances. Think of: antenna type, antenna placement, type of feed line, feed line placement and especially local sources of interference. There are manufacturers that promise in advance a significant drop in interference, however this is not real. There are cases where the noise level decreases by two to three S points, but also cases where the filter has almost no effect. This kit includes: IP65 enclosure 100 x 100 x 55 mm (Polycarbonat) Ringcore Amidon FT240-31 Winding wire 18 AWG – 4x 85cm PTFE 19 x 0.25 mm copper “Silver plated” Toroid mounting plate Stainless steel M3 6mm screws 4x Stainless steel M3 Spring washer 4x 2x PL 259 Chassis 2x M3 cable lug 8x Stainless steel M3 Bolt 12mm 8x Stainless Steel M3 Nut 8x Stainless steel M3 washer 8x Stainless steel M3 tooth washer IMPORTANT! Do not place the common mode choke in case of an End Fed antenna directly at feed point of the antenna.