EME183 Series Filter Kits

EME183-LPF7-54M
Basic LPF7-54M 7th Order Low Pass Filter

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EME183 Description:

The Mini-Kits EME183 PC 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. The Low Pass Filters are ideal for use with the Mitsubishi RF power modules to effectively filter harmonics.

Kit Constructors Alert:

1/ Plated through holes were used on the RF connections to allow coaxial cable to be used. If you are fitting the PC board onto a flat metal surface, then shorting of the RF connections could occur on the bottom ground plane side of the board. The plated holes can either be countersunk on the bottom ground plane side of the board, or the metal mounting surface can be countersunk where the connections could short.

LPF7-54M Kit Notes:

The 7th order Chebychev 54MHz low pass filter was designed for low loss and is suitable for use with the Mitsubishi RA30H0608M module for use on the 6M Amateur band. Plastic pack Mitsubishi modules require a suitable Low Pass Filter to reduce the -25dBc second harmonic to a suitable level that complies with current ACMA and FCC rules of at least -50dBc. The filters were designed to handle at least 100 Watts CW, and use Hi-Q 500v ceramic capacitors and airwound inductors for low RF power loss.

Some very slight spreading of the two outer coils will improve the return loss of the filter.

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EME183-LPF7-54M
LPF7-54M 6M Band 54MHz Low Pass Filter
LPF7-54M Response
LPF7-54M Frequency Response and Return Loss

LPF7-75M Kit Notes:

The 7th order Chebychev 75MHz low pass filter was designed for low loss and is suitable for use with the Mitsubishi RA30H0608M module for use on the 4M Amateur band. Plastic pack Mitsubishi modules require a suitable Low Pass Filter to reduce the -25dBc second harmonic to a suitable level that complies with current ACMA and FCC rules of at least -50dBc. The filters were designed to handle at least 100 Watts CW, and use Hi-Q 500v ceramic capacitors and airwound inductors for low RF power loss.

Some very slight spreading of the two outer coils will improve the return loss of the filter.

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EME183-LPF7-75M
LPF7-75M 4M Band 75MHz Low Pass Filter
LPF7-75M Response
LPF7-75M Frequency Response and Return Loss

LPF7-170M Kit Notes:

The 7th order Chebychev 170MHz low pass filter was designed for low loss and is suitable for use with all the Mitsubishi VHF 130 to 170MHz power modules including the RA80H1415M1 for use on the 2M Amateur band. Plastic pack Mitsubishi modules require a suitable Low Pass Filter to reduce the -25dBc second harmonic to a suitable level that complies with current ACMA and FCC rules of at least -50dBc. The filters were designed to handle at least 100 Watts CW, and use Hi-Q 500v ceramic capacitors and airwound inductors for low RF power loss.

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EME183-LPF7-170M
LPF7-170M 2M Band 170MHz Low Pass Filter
LPF7-170M Response
LPF7-170M Frequency Response and Return Loss

LPF7-450M Kit Notes:

The 7th order Chebychev 450MHz low pass filter was designed for low loss and is suitable for use with all the Mitsubishi UHF 400 to 450MHz power modules for use on the 70CM Amateur band. Plastic pack Mitsubishi modules require a suitable Low Pass Filter to reduce the -25dBc second harmonic to a suitable level that complies with current ACMA and FCC rules of at least -50dBc. The filters were designed to handle at least 100 Watts CW, and use Hi-Q 500v ceramic capacitors and airwound inductors for low RF power loss.

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EME183-LPF7-450M
LPF7-450M 70CM Band 450MHz Low Pass Filter
LPF7-450M Response
LPF7-70CM Frequency Response and Return Loss.

Mounting into a Die cast Enclosure:

Currently there is no specific enclosure to suit these filter boards. It is recommended to fit the board inside the same enclosure as the RF power amplifier to provide good shielding. Mini-Kits stock a number of Hammond diecast enclosures that are suitable for mounting both a mitsubishi PA module and filter board.

Changes and Modifications:

1/ Plated through holes were used on the RF connections to allow coaxial cable to be used. If you are fitting the PC board onto a flat metal surface, then shorting of the RF connections could occur on the bottom ground plane side of the board. The plated holes can either be countersunk on the bottom ground plane side of the board, or the metal mounting surface can be countersunk where the connections could short.