EME164 Series Filter Kits

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EME164 Description:

The Mini-Kits EME164 PC Board has been designed for constructing simple filters using either conventional leaded, or SMD components, and fits into a Hammond 1590A enclosure. 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.

Please Note: These filters are designed for receiver applications only and are not designed for transmitting power over 10 Watts through. Many older Transceivers has a receiver loop through on the back panel that can be used to connect to external filters.

Kit Constructors Alert:

1/ There are no current alerts.

HPF11-1M8 Kit Notes:

The HFP11-1M8 is a 11th order 1.8MHz high pass filter, and has been designed to protect HF receivers from overload or inter modulation caused by very high AM broadcast band signals. The images below show both sides of the board. The filter uses a number of 1206 size NPO SMD capacitors that are easily fitted to the bottom side of the board, and the inductors are wound using T50-1 Toroids. The filter essentially is no tune, and no alignment or test equipment is required. The filter is not designed for transmitter applications but will handle up to 10 Watts CW.

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eme164-3A Top View
Top view of the 11th Order 1.8MHz High Pass Filter
eme164-3A Bottom View
Bottom View of the 11th Order 1.8MHz High Pass Filter board showing the positions for the filter capacitors.
HPF11-1M8-Plot1
The above plot shows the s21 through loss and S11 return loss of the 1.8MHz High pass filter from 0.1 to 3MHz
HPF11-1M8-Plot2
The above plot shows the s21 through loss and S11 return loss of the 1.8MHz High pass filter from 0.1 to 60MHz

LPF9-0M5 Kit Notes:

The LFP9-0M5 is a 9th order 500kHz low pass filter, and has been designed to protect NDB receivers from overload or inter modulation caused by very high AM broadcast band signals. The image below shows where most of the components and wire links are fitted. There are no component that need to be fitted on the bottom side of the board. The filter essentially is no tune, and no alignment or test equipment is required. The filter is not designed for transmitter applications but will handle up to 10 Watts CW.

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500kHz Low Pass Filter Top View
Top view of the 9th Order 500kHz Low Pass Filter
500kHz Low Pass Filter Enclosure View
Top view of the 9th Order 500kHz Low Pass Filter in a Hammond 1590A Enclosure
LPF9-0M5-Plot1
The above plot shows the s21 through loss and S11 return loss of the 500kHz Low pass filter from 0.01 to 1MHz
LPF9-0M5-Plot2
The above plot shows the s21 through loss and S11 return loss of the 500kHz Low pass filter from 0.1 to 3MHz

Mounting into a Die cast Enclosure:

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, M9, drill bits, scriber, metal punch, and a hammer.

EME173-70CM 1590A
The picture shows a complete built HPF11-1M8 product in a Hammond 1590A Enclosure
EME164-ENC-5
The picture shows the positioning of the holes required for the BNC connectors
EME164-ENC-3
The enclosure requires countersinking of the M3 drilled holes so that the countersunk screws are flush to the bottom of the enclosure
EME164-ENC-4
The picture shows how the washers are mounted under the 8mm brass spacers to provide extra clearance for the countersunk screws
EME164-ENC-6
How the BNC connector are mounted and wired to the board. Some locking varnish was used to secure the nuts.

Mounting Procedure:

There can be some variations with connectors, and mounting hardware thicknesses that may require some experimentation when mounting boards into enclosures

  • Place the bare PCB into the enclosure and mark the 4x mounting holes for drilling. Centre punch and drill the holes with a 3mm diameter drill. On the bottom side of the board use a counter sinking bit and drill to suit the M3x6mm countersunk screws. Mark and drill two 9mm holes for the BNC chassis connectors, and file one side to a flat to suit the connector body. hole to suit.

  • Fit the M3x6mm hex spacers to the enclosure using the M3x6mm countersunk screws fitting the M3 washers between the enclosure and spacers. This is to allow for the countersinking depth and the screws thread so that the screws can be fully tightened. See the picture above

  • Mount the PC board into the enclosure using the M3x6mm Phillips screws. Make sure that you have the board ready for connecting to the BNC connector as it is more difficult once the connectors are fitted to fix things after.

  • Fit the BNC connectors and mount the shake proof washers and carefully tighten the nuts. In most cases the lug supplied with the BNC connectors are not required as the grounding between the enclosure and PC board is quite good.

  • Finally solder some 0.7mm wire from the PC board RF connections to the BNC connectors.

Changes and Modifications:

1/ There are no current changes to this Kit.