Filters for shortwave

Set of band filters 160-10m New

Band Filter

A complete set of single band filters for the traditional bands from 160 to 10m. The filters are equiped with PL (SO-239) sockets and are inserted between transceiver and amplifier. They offer an enormous suppression of noise and interference from other bands. This drastically reduces intermodulation problems on the receiver. Further than that unwanted emissions from the own transmitter are suppressed as well.

Usually multi-station contest operations can not live without such filters, but also single-op stations can benefit from using such filters. The filters come in a solid aluminium case, have an insertion loss of less than 0.6 dB and are shipped with an individual measurement protocol. The max allowed power level is 200 Watt 'key down'.

Article will be ordered only on customer request.
Delivery time about 5 weeks.

Order No.
12420 Set of band filters, 6pcs (160,80,40,20,15,10m) 755.00 € Buy now New
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Plots Remo Band filter

Remote-controlled 6-way Band Filter for shortwave New

6-way Band Filter

This 6-way band filter was developed for contest stations which require a comfortable remote control, but ca be helpful at the station at home as well. It consists of a box with 6 switchable band pass filters and a remote control box. The six band filters are designed for the traditional contest bands 160, 80, 40 ,20 15 and 10m. The remote control box is connected with a DB9 cable to the filter box. The small control unit is positioned conveniently close to the operator while the filterbox can be installed anywhere near the amplifiers or antenna outlets. The solid box is made from coated aluminium and uses PL (SO-239) sockets.

Each device is shipped with an individual measurement protcol for each filter which shows insertion loss (S21), return loss attenuation (S11), frequency response an VSWR. The max. power load is 200W CW 'key down'. The fitlers suppress the second harmonix frequency by about 80 db. A control cable is not supplied. You can use any 8 wire cable and supply a 12V signal to the filter box (1 of 7). The length of the control cable is not limited as long as the voltage is around 12V.

Article will be ordered only on customer request.
Delivery time about 5 weeks.

Order No.
12430 6-way remote controlled band pass filter 950.00 € Buy now New
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Bandpass filters for shortwave

Bandpass filters are used to effectively reduce strong signals outside the operating band. This reduces noise and in-band noise, in a receiver there is a much lower risk of producing unwanted signals in the mixer. This gives better overall reception.

On the transmit side, spurious emission signals are suppressed as well, reducing interference with the neighbouring stations. The 160m high-pass filter reduces all signals below 1700 kHz (medium and long wave band) which in turn reduces the load of strong broadcast stations on the receiver input and leads to better reception.

Bandpass filters are often used at contest stations, for example in Multi/Multi or Multi/2 setups. Built also smaller stations with one operator and two stations (SO2R) can benefit from good filters by reducing the interference between the two radios. Hunt for contest multipliers on one band while transmitting on another band!

The band filters are constructed with high quality ceramic ATC capacitors, to reduce insertion loss. Also these capacitors allow a higher power handling of 1000 W PEP. The filters have PL sockets (SO-239) and are inserted by using a short coaxial cable right behind the amplifier and before the antenna. Impedance 50 Ω, size incl. PL sockets 125 x 58 x 58mm.

Order No.
12400.160 Bandpass filter 160m 1kW 149.00 € Buy now
12400.80 Bandpass filter 80m 1kW 119.00 € Buy now
12400.60 Bandpass filter 60m 1kW 119.00 € Buy now New
12400.40 Bandpass filter 40m 1kW 119.00 € Buy now
12400.30 Bandpass filter 30m 1kW 119.00 € Buy now
12400.20 Bandpass filter 20m 1kW 119.00 € Buy now
12400.17 Bandpass filter 17m 1kW 119.00 € Buy now
12400.15 Bandpass filter 15m 1kW 119.00 € Buy now
12400.1210 Bandpass filter 12 & 10m 1kW 119.00 € Buy now
12405.160 High pass filter 160m 1kW 129.00 € Buy now
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Note: Never use an auto tuner with high rf power when using the band pass filters. Only use low RF power to auto tune your VSWR, and switch your auto tuner to manual operation before using high power.

LPF-1 Low Pass Filter 1.8-30 MHz, 1500W

typical diagrams of individual filters
LPF-1 Low Pass Filter

The 'classic' low pass filter for short wave. Insertion attenuation typ. 0.15, max. 0.2 dB. 1500 W 'key down', 3000 W at SSB/CW contest style operation. Trap attenuation above 40 MHz. >60 dB. Connector 2x PL jack.

  • Technical data:
  • Bandwidth: 1.8 - 29.7MHz
  • Stopband: above 40MHz
  • Losses in the passband: no more than 0.2dB
  • Out of band attenuation: at least 60dB.
  • Maximum continuous power, time unlimited: 1500W
  • CW/SSB contest style operation: 3 kW
  • Maximum peak power: 5 kW
  • VSWR max: 1:1.2
  • Impedance: 50 Ohm
  • Dimensions: 235x65x65mm
  • Weight: 0.9kg
Order No.
LPF-1 30MHz Low Pass Filter 149.00 € Buy now
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LPF-3000 Low Pass Filter 0-32 MHz, 3000 W New

LPF-3000

Same as LPF-1, but 3000 W PEP, 5000 W peak power.

0-32 MHz, 0.2 dB insertion loss. Massive aluminium base plate, >80 dB attenuation at 48 MHz. Dimensions 110x600x120mm, weight 3 Kg, connectors 2x PL

Order No.
LPF-3000 Low Pass Filter 3KW PEP 480.00 € Buy now New
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MFJ-704 Low Pass Filter 1.8-30 MHz, 1500 W PEP

MFJ-704 Low Pass Filter

Low pass filter for shortwave, 1.8-30 MHz, 1500 Watt SSB PEP. Connectors 2x PL jack. Dimensions 8x8x23cm, with 2 mounting holes for fixation to wall.
Specification for max. power applies for an output SWR of less than 2:1

Order No.
MFJ-704 Low Pass Filter 1.8-30 MHz 79.00 € Buy now
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Download: MFJ-704 attenuation plots (PDF, 66KB)

OM-6BPF Bandpass filter

OM-6BPF Bandpass filter

The Band Pass Filter OM6BPF is designed for all short wave amateur bands from 1.8 to 29 MHz (exclusive WARC-bands ) for 200 W power.

Specification:

  • Frequency coverage: amateur bands 1.8 - 29.7 MHz exclusive WARC
  • Design: 3 resonator filters
  • Power rating: 200 W in SSB, CW, RTTY, AM and FM
  • Input impedance: 50 Ohm
  • SWR: Less then 1.2 : 1 across band
  • Output impedance: 50 Ohm unbalanced
  • Insertion loss: very low insertions loss due to High-Q capacitors, hand tuned for maximum performance
  • Control methods: Automatic with Yaesu , Icom , Elecraft , OM Power automatic amplifiers , Banddecoder for example microHAM devices
  • Power supply: External between +12 V to 15 V
  • LED indicators: Automatic mode
  • Band indications
  • Bypass Mode
  • Parameters: 210 x 75 x 320 mm (width x height x depth)
  • Weight: 2.3 kg

OM-6BPF Typical Filter Response
(click to enlarge)
Measured Typical Band to Band Rejection
MHz max. loss (dB) max. SWR Crossband minimum loss (dB)
1.8 0.25 1.1 3.5 MHz 7 MHz 14 MHz 21MHz 28MHz
2.0 0.25 1.1 47 70 60 53 70
3.5 0.25 1.1 1.85 MHz 7 MHz 14 MHz 21MHz 28MHz
3.8 0.25 1.1 42 46 60 55 50
7.0 0.3 1.15 1.85 MHz 3.5 MHz 14 MHz 21MHz 28MHz
7.3 0.3 1.15 66 46 70 55 47
14.0 0.3 1.15 1.85 MHz 3.5 MHz 7 MHz 21 MHz 28 MHz
14.4 0.3 1.15 80 62 41 38 60
21.0 0.4 1.2 1.85 MHz 3.5 MHz 7 MHz 14 MHz 28 MHz
21.5 0.4 1.2 75 75 65 35 58
28.0 0.4 1.2 1.85 MHz 3.5 MHz 7 MHz 14 MHz 21 MHz
29.7 0.4 1.2 80 90 70 47 27
Order No.
OM-6BPF OM-Power OM-6BPF Bandpass filter 860.00 € Buy now
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High pass filters 1700 kHz New

Elad PHP-1M7 Filter

ELAD High pass filter from 1700 kHz suppress effectively any signals from powerful medium or long wave transmitters. The relieves the receiver from extremely strong signals, which results in less cross modulation products and an increased receiver sensitivity. These filters are available in a version for receivers only (SDRs and classical receivers) and in a version for QRP transceivers, with a maximum power load of 10W. Both filters are equipped with PL sockets.

Order No.
PHP-1M7 High pass 1700 kHz, max. power up to 10 W 63.00 € Buy now New
PHP-1M7.RX High pass 1700 kHz for receivers, SDR etc. 48.00 € Buy now New
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Common mode filter

New filter concept fights against TVI and BCI

Bild CMF-2000
Bild CMF-5000

In some cases traditional low pass filters have a limited effect on TVI and BCI. Usually because these interferences are not caused by harmonics but by common mode currents on the outer shield of the feed line, these currents are not affected by low pass filters.
To solve these problems a new kind of filter is available - the common mode filter for 1.8 to 54MHz, which is inserted into the feedline just as a low pass, as close to the transceiver as possible. Common mode suppression up to 250MHz and up to 50dB.
Two versions are available: max. 2000 W or max. 5000 W power load (key down!), insertion loss max. 0.1dB.
In Japan, a land with very high amateur radio density and lot's of TVI situations, already a quarter million of these filters have been sold and used successfully. Connectors 2x PL.

For convenient connection to the transceiver, add to your order:
for the 2000 W version a PL angle 90° with plugs (male) on both sides Order No. 42022.01;
for the 5000 W version order a PL angle adaptor (M/F, Order No. 42022) and a dual PL connector (M/M, Order No. 42024)

Order No. Max. Power (CW) Dimensions Connectors
CMF-2000 2000 Watt 380x54 mm PL
CMF-5000 5000 Watt 300x54 mm PL
Order No.
CMF-2000 122.00 € Buy now
CMF-5000 169.00 € Buy now
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MFJ-915 Common mode filter

Bild MFJ-915
Common mode filter - low cost version by MFJ. Frequency range 1.8 - 30 MHz, size 13x5cm, PL jacks, max. 1500 W PEP.
Order No.
MFJ-915 44.90 € Buy now
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Coax-Common mode filter

Powerful common mode filter for use directly after the station or the amplifier in the shack.
For additional protection against rain, this lock can also be used at the antenna. The filter uses RG-213/U and a number of ferrite cores to block standing waves directly at the station.
Capacity up to max. 1500W, length 1m, 2x PL-plug, 1x PL-double female included.

Order No.
11540 Coax-Common mode filter 44.00 € Buy now
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Ferrite toroids

Assorted Ferrite Cores

Selection contains:

  • 2x ferrite toroids for 5 mm cable (article 40092.5)
  • 2x ferrite toroids for 9 mm cable (article 40092.9)
  • 2x ferrite toroids for 11 mm cable (article 40092.11)
  • 1x Large ferrite toroids, rectangular (article 40090)

Order No.
40092.BUNDLE 44.00 € Buy now
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Angular ferrite toroids Clamp-On Ferrite

Fight interferences with toroidal ferrites (clamp-on ferrites). Just wrap the cables of the affected device once or several times around the toroid, close it, ready. Suitable for all types of cables. Optimal frequency range 0.5 to 200 MHz.

Order No.
40090 9.50 € Buy now
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Round Ferrite core


Ferrite Cores

For all kind of round cables (Datac ables, coax cable, rotor control etc.). Very good suited for fighting interference of computers (keyboard or USB cable)... some PCs just can't stand the HF power.
Depending on the situation to be installed at either end of the cable. A selecteion of ferrite cores is a must for every DXpedition!

Of course you can try to build a common mode filter with these cores, but you will need several cores on the cable (at least for shortwave). If you are looking for ready made common mode filters, check our article 11368, right here.


Product Max. Cable diameter Length Diameter Type Price  
40092.5 5.4mm 29.4mm 15.9mm Round 3.80 € Buy now
40092.6 6.1mm 23.4mm 14mm Square 4.30 € Buy now
40092.9 8.9mm 35.1mm 19.5mm Round 4.80 € Buy now
40092.11 11.7mm 33.0mm 23.0mm Square 4.90 € Buy now
40092.13 13.0mm 36.0mm 23.0mm Round 5.50 € Buy now

More Ferrite cores

Here you can find more ferrite cores suitable for baluns, filters, chokes etc.