EME174 Series Filter Kits

EME173A6 KIT

HPF9-1.8M Filter Mounted in an optional Hammond 1550Q die cast enclosure

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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.

HPF9-1M8 Kit Notes:

Basic 1.8MHz High Pass Filter Kit
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.

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HFP9-1M8-1

The above graph shows the through loss of the 1.8MHz high pass filter. The readings under -60dB are limited by the equipment.

HPF9-1M8-2

The above graph shows the loss up to 150MHz

BPF7-160M Kit Notes:

Basic 160M Band Pass Filter Kit
Designed as a front end filter for the 160 metre band. Provides over 90dB 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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BFP7-160M-1

The above graph shows the through loss and bandwidth of the 160M band pass filter.

BPF7-160M-2

The above graph shows the return loss.

BPF7-80M Kit Notes:

Basic 80M Band Pass Filter Kit
Designed as a front end filter for the 80 metre band. Provides over 80dB 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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BFP7-80M-1

The above graph shows the through loss and bandwidth of the 80M band pass filter.

BPF7-80M-2

The above graph shows the return loss

BPF7-40M Kit Notes:

Basic 40M Band Pass Filter Kit
Designed as a front end filter for the 40 metre band. Provides over 46dB 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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BFP7-40M-1

The above graph shows the through loss and bandwidth of the 40M band pass filter.

BPF7-40M-2

The above graph shows the return loss.

BPF7-30M Kit Notes:

Basic 30M Band Pass Filter Kit
Designed as a front end filter for the 30 metre band. Provides over 20dB 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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BFP7-30M-1

The above graph shows the through loss and bandwidth of the 30M band pass filter.

BPF7-30M-2

The above graph shows the return loss

BPF7-20M Kit Notes:

Basic 20M Band Pass Filter Kit
Designed as a front end filter for the 20 metre band. Provides over 40dB 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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BFP7-20M-1

The above graph shows the through loss and bandwidth of the 20M band pass filter.

BPF7-20M-3

The above graph shows the loss if the filter was to be used with a 9MHz I/F.

BPF9-15M Kit Notes:

Basic 15M Band Pass Filter Kit
Designed as a front end filter for the 15 metre band. Provides over 60dB 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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BFP9-15M-1

The above graph shows the through loss and bandwidth of the 15M band pass filter.

BPF9-15M-2

The above graph shows the return loss

BPF9-10M Kit Notes:

Basic 10M Band Pass Filter Kit
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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BFP9-10M-1

The above graph shows the through loss and bandwidth of the 10M band pass filter.

BPF9-10M-2

The above graph shows the return loss

Mounting Into a Die cast Enclosure:

OPTIONAL FILTER HARDWARE KIT

1 x ENCL03 Hammond 1550Q Enclosure
4 x PP-M3x6-NB M3x6mm Pan Phillips Screw
4 x CS-M3x6-ZS M3x6mm Countersunk Screw
4 x PS-M2.5x6-ZS M2.5x6mm Pan Slot Screw
2 x EYE-M3-A M3 Solder Eyelet Lug
4 x N-M2.5-ZS M2.5 ZS Nut
4 x SPA-M3x8-A M3x8mm Spacer
4 x WSP-M3-NS M3 Shake proof Washer
2 x WFL-M2.5-ZS M2.5 Flat Washer

Mounting Procedure:

  • 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.

 

Kit Changes and Modifications

EME174 Filter Kits

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

2/ The EME174 PC bboard 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.

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