EME3-50 MHz 6 meter Band-Pass Filter with Low Noise Preamplifier 1500W T/R Relay

EME3-50 MHz 6 meter Band-Pass Filter with Low Noise Preamplifier 1500W T/R Relay

(1 customer review)


6 meter 50 MHz – 54 MHz High Selectivity Low Loss Band Pass Filter with PGA-103+ Low Noise Preamplifier and 1.5 kW QRO Transmit-Receive Relay EME3-50

Embedded in the box: High Q, Super Low Loss Band-pass Filter, PGA-103+ Wide-Band Low Noise Amplifier, and QRO relay.


EME3-50-MHz-High-Q-Low-Loss-Bandpass-Filter-Amplifier-50-54MHz-with-PGA-103+Very-Low-Noise-Preamplifier-1500W T/R Relay Made by antennas-amplifiers.com

QRO made on low dielectric loss RT/duroid® 5880 Laminates (not on FR4 Important!).

This EME 3 – 50 device consists of three components:
1. 50 – 51 MHz High Selectivity, High Q, Low Loss RX Bandpass Filter BPF (up to 54 MHz). Price: 89 EUR.
2. Wideband Low Noise Amplifier. Price: 59 EUR.
3. High Power Relay with “N” connectors. Price: 80 EUR.

Receive gain:

7.1 MHz < -59 dB
14.15 MHz = -41 dB
21.2 MHz = -30 dB
28.4 MHz = – 20 dB
50 MHz =+26.6dB, NF=0.8 dB, Input RL-10dB, IP3out > 36 dBm
51 MHz =+26.6dB, NF=0.8 dB, Input RL-10dB, IP3out > 36 dBm
52 MHz =+26.7dB, NF=0.8 dB, Input RL-12dB, IP3out > 36 dBm
54 MHz =+26.9dB, NF=0.8 dB, Input RL-16dB, IP3out > 36 dBm

Harmonics and interfering signals:

70.2 MHz = -6 dB
88 MHz= -27 dB
98 MHz= -35 dB
108 MHz= -40 dB
144.1 MHz = -42 dB
Power consumption +12 V, 220 mA

Transmit side:

Input RL: <= -40 dB, Insertion loss: 0.03 dB

Maximum power input at SWR:

1:1 = 1500 W; 1:1.5 = 1100 W; 1:2 = 800 W; 1:3 = 600 W

EME3-50 6m High Selectivity, High Q, Low Loss Bandpass Filter with PGA-103+ Very Low Noise Preamplifier and 1500W T/R Relay Schematic:


6m-EME-Low-Loss-Bandpass-Filter-with-PGA-103+Preamplifier-1500W T/R Relay Schematic


Product versions:

1. With “N” connectors. Listed price.
2. With 7/16 DIN Antenna and TX IN connector. “N” connector on RX OUT. Listed price + 30 EUR

Outdoor version:

All the options above can be made for Outdoor mounting and it is + 9 EUR.
1. EME 3 50 – 54 MHz High selectivity, High Q, Low Loss Band-pass
Filter with pre-amplifier and Transmit / Receive
2. Special “Plastic Box – DB” with IP63 standard (Resistant to Rain, Wind, and UV)
3. Mast mounting clamp for plastic boxes with a serrated saddle for up to 50 mm pipe.

Measure data on the assembled filter with HP8753ES full 2-port calibrated are presented below.

EME3-50 Measured gain




EME 3-50 Band Pass filter with PGA103+ Preamplifier and T/R relay Measured HF:




50 MHz – 54 MHz Low Loss Bandpass Filter For Tropo – EME with PGA-103+ Preamplifier 1500W T/R “Narrowband View”:


50 - 54 MHz 6m Bandpass Filter with PGA-103+ Zoomed Made By antennas-amplifiers.com


6m Low Loss Bandpass EME-Tropo Filter with PGA-103+ Preamplifier 1500W T/R Relay Measured Harmonics Attenuation:




50 MHz Bandpass filter with PGA-103+ preamplifier 1500W T/R relay measured insertion loss and return loss on the transmit side.


50MHz Low Loss Band pass Filter with PGA103+ Measured Transmit Insertion Loss Return Loss S21 and S11 Made By antennas-amplifiers.com


Designed to be used with transceivers with separate RX antenna input connectors.

Our EME – Earth-Moon-Earth family. BandPass filters + Amplifiers + High Power Relays

6 meter band, EME2 – 50: EME2-50

6 meter band, EME3 – 50: This one.

4 meter band, EME2-70: EME2-70

4 meter band, EME3-70: EME3-70

2 meter band, EME2-144: EME2-144

2 meter band, EME3-144: EME3-144

70 cm band, EME2-432: Soon

70 cm band, EME3-432: Soon


Weight 0,80000000 kg

1 review for EME3-50 MHz 6 meter Band-Pass Filter with Low Noise Preamplifier 1500W T/R Relay

  1. Yoshiharu Tsukuura

    I am a lover of your EME3-50.
    I have installed it directly under my antenna and it has been very useful.
    Thank you very much.

    JP1LRT Yoshiharu Tsukuura

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