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 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 “Narrow band View”:


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


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




50 MHz Band pass filter with PGA-103+ preamplifier 1500W T/R relay measured insertion loss and return loss on 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 connector.

Our EME – Earth-Moon-Earth famil. Band-Pass 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


Additional information

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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