EME184 Series Filter Kits

• EME184 PC board Description: Updated! June 2022
• Kit Constructors Alert:
• HPF9-1M Kit: 1.8MHz 9th order high pass filter Discontinued
• BPF7-160M Kit: 160 metre band 7th order band pass filter
• BPF7-80M Kit: 80 metre band 7th order band pass filter
• BPF7-40M Kit: 40 metre band 7th order band pass filter
• BPF7-30M Kit: 30 metre band 7th order band pass filter
• BFP7-20M Kit: 20 metre band 7th order band pass filter
• BPF9-15M Kit: 15 metre band 9th order band pass filter
• BPF9-10M Kit: 10 metre band 9th order band pass filter
• Mounting In A Die cast Enclosure:
• Kit changes and Updates:
• Buy a EME184 Series Filter Kit:

The Mini-Kits EME174 PC Board has been replaced with the EME184 PC Board, ( September 2014 ). The board has been designed for constructing simple filters using either conventional leaded, or SMD components. Kit part numbers are prefixed for filter type, ( LPF Low Pass, BPF Band Pass or HPF High Pass ), the number after is the filter order, followed by the band or frequency in MHz. These filters are easy to construct, and require minimal alignment if constructed as per the Kit notes.

There are no current alerts.

The 1.8MHz 9th order high pass filter was designed to reduce the signals levels in the AM broadcast band, and is particularly useful to protect short wave receivers that may suffer from strong signals causing inter modulation.

THIS PRODUCT HAS BEEN DISCONTINUED AND REPLACED WITH THE HPF11-1M8

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  Top View of the HPF9-1M8 Mounted in a Hammond 1550Q Enclosure.

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  The above graph shows the S21 through loss of the HPF9-1M8 from 0 to 5MHz. The readings under -60dB are limited by the equipment.

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  The above graph shows the S21 through loss of the HPF9-1M8 from 0 to 150MHz.

Designed as a front end filter for the 160 metre band. Provides over 90dB IF rejection at 9MHz. Filters have been modeled on the PA3AKE Chebychev filter designs, and cover the popular HF amateur bands. Low loss NPO ceramic capacitors have been used along with wire wound high Q inductors to reduce RF losses.

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  Top View of the BPF7-160M 160M Band Pass Filter Module.

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  The above graph shows the S21 through loss of the HPF9-1M8 from 0 to 5MHz.

Designed as a front end filter for the 80 metre band. Provides over 80dB IF rejection at 9MHz. Filters have been modeled on the PA3AKE Chebychev filter designs, and cover the popular HF amateur bands. Low loss NPO ceramic capacitors have been used along with wire wound high Q inductors to reduce RF losses.

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  Top View of the BPF7-80M 80M Band Pass Filter Module.

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  The above graph shows the S21 through loss of the BPF7-80M from 3.75 to 4.16MHz.

Designed as a front end filter for the 40 metre band. Provides over 46dB IF rejection at 9MHz. Filters have been modeled on the PA3AKE Chebychev filter designs, and cover the popular HF amateur bands. Low loss NPO ceramic capacitors have been used along with wire wound high Q inductors to reduce RF losses.

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  Top View of the BPF7-40M 40M Band Pass Filter Module.

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  The above graph shows the S21 through loss of the BPF7-40M from 5.15 to 9.15MHz.

Designed as a front end filter for the 30 metre band. Provides over 20dB IF rejection at 9MHz. Filters have been modeled on the PA3AKE Chebychev filter designs, and cover the popular HF amateur bands. Low loss NPO ceramic capacitors have been used along with wire wound high Q inductors to reduce RF losses.

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  Top View of the BPF7-30M 30M Band Pass Filter Module.

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  The above graph shows the S21 through loss of the BPF7-30M from 8 to 12MHz.

Designed as a front end filter for the 20 metre band. Provides over 40dB IF rejection at 9MHz. Filters have been modeled on the PA3AKE Chebychev filter designs, and cover the popular HF amateur bands. Low loss NPO ceramic capacitors have been used along with wire wound high Q inductors to reduce RF losses.

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  Top View of the BPF7-20M 20M Band Pass Filter Module.

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  The above graph shows the S21 through loss of the BPF7-20M from 12.15 to 16.15MHz.

Designed as a front end filter for the 15 metre band. Provides over 60dB IF rejection at 9MHz. Filters have been modeled on the PA3AKE Chebychev filter designs, and cover the popular HF amateur bands. Low loss NPO ceramic capacitors have been used along with wire wound high Q inductors to reduce RF losses.

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  Top View of the BPF9-15M 15M Band Pass Filter Module.

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  The above graph shows the S21 through loss of the BPF9-15M from 16.25 to 26.25MHz.

Designed as a front end filter for the 10 metre band. Provides over 70dB IF rejection at 9MHz. Filters have been modelled on the PA3AKE Chebychev filter designs, and cover the popular HF amateur bands. Low loss NPO ceramic capacitors have been used along with wire wound high Q inductors to reduce RF losses.

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  Top View of the BPF9-10M 10M Band Pass Filter Module.

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  The above graph shows the S21 through loss of the BPF9-10M from 21 to 36MHz.

This is for advanced constructors that have experience and access to a workshop with metal working tools. The basic tool requirements are a drill press, Vice, M1.5, M3, M6, and 1.4 inch drill bits, scriber, metal punch, and a hammer.

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  Mounting of the EME184 PCB into a Hammond 1550Q Enclosure.

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  How the SMA connectors are mounted using 2.5mm screws and nuts to the Enclosure.

It is suggested that if you are going to mount the board in a Hammond enclosure, that you mount the Toroids on the same side of the board as the capacitors.

• Construct the PC board as per the Kit notes but DO NOT fit the SMA35 sockets to the board.
• Put the PC board into the enclosure and mark through the 4 holes in the PC board to the bottom of the enclosure using a fine felt tip pen.
• Centre punch and drill 4 x M3 holes in the bottom of the enclosure, then countersink the 4 holes on the outer of the enclosure to suit the 4x M3x6mm countersunk screws.
• Using the 4 x M3x6mm countersunk screws, mount the 4 x M3x8mm spacers using the 4 x M3 shake proof washers under the spacers to the enclosure. The washers are used to increase the height of the spacers so that the countersunk screws can be fully tightened.
• Carefully mark and drill two 4mm holes for the SMA connectors in the die cast enclosure as shown in the picture above.
• Fit the two SMA sockets to the enclosure, and mark the mounting holes using a fine felt tip pen. Centre punch and drill these out using a 2.5mm drill bit to suit the mounting of the SMA connectors.
• Place the PC board into the enclosure and bolt to the M3x8mm spacers using the 4x M3x6mm screws.
• Fit the SMA connectors to the enclosure using the M2.5x6mm screws, M2.5 washers and Nuts. A M3 solder lug is used on each of the SMA connectors to connect to the PC board top ground plane.
• Connect some tin plated wire between the strip lines on the board to the centre pins of the two SMA connectors.
• This concludes the construction of the complete boxed Kit which can now be tested.

1/ The EME174 Low Pass VHF and UHF Filters have now changed to the new EME183 PC board.

2/ The EME174 PC board has been replaced with the EME184 PC board ( September 2014 ). The replacement board is the same for filter construction, and no longer has the tracks on the bottom side of the board that were used to construct the EME174 Amplifier kit. The amplifier Kit has now been discontinued.

3/ The HFP9-1M8 has been replaced with the HPF11-1M8 with better rejection of the AM band.