A Complete Solution for 4 meter 70-70.5 MHz 1500W Transmit-Receive Competition System with Low Loss Receive Band Pass Filter and Preamplifier EME3-70
QRO – Extreme power on transmit and low noise on receive with an integrated band-pass filter. Version for split RX.
QRO made on low dielectric loss RT/duroid® 5880 Laminates (not on FR4 Important!).
EME3-70 device consists of three components:
1. 70-70.5MHz High Selectivity, High Q, Low Loss RX Bandpass Filter. Specially designed to suppress HF, 50MHz, FM and 2m signals
2. Wideband Low Noise Amplifier.
3. Double High Power Relays with 16A contacts.
Receive gain:
Frequency and Gain:
1.82 MHz: < – 100 dB
7.1 MHz: < – 80 dB
14 MHz: < – 52 dB
21 MHz: < – 42 dB
28 MHz: < – 32 dB
50 MHz: < – 6 dB
70 MHz: +26 dB, NF= 0.8 dB, Input RL= -15dB, IP3out >36dBm
70.5 MHz: +26 dB, NF= 0.8 dB, Input RL= -15dB, IP3out >36dBm
98 MHz: < – 10 dB
108 MHz: < – 37 dB
140 MHz: < – 30 dB
144 MHz: < – 31 dB
288 MHz: < – 30 dB
432 MHz: < – 48 dB
Extreme Low Loss on the transmit side thanks to RT/duroid® 5880 Laminate. Less than 0.04 dB.
With Excellent Wide-band Return Loss of 70 – 75 MHz. Better than -35 dB.
Transmitting side of EME3-70:
Frequency: | Input Return Loss (S11): | Insertion Loss (S21): |
70 MHz | < – 35 dB | 0.02 dB |
70.5 MHz | < -35 dB | 0.02 dB |
Gain -26 dB, NF= 0.8 dB, Input RL= -15dB, IP3out >36dBm
1500W Low Noise Preamplifier with Relay Switches and Band Pass Filter EME3-70 Measured Gain on 40m to 6m (7MHz to 50MHz)
4m 1500W Transmit/Receive Relay Switches Low Noise Preamplifier Band-pass Filter EME3-70 Measured Gain 28 MHz to 144 MHz
Characteristics:
Power consumption: + 12 V, 220 mA
Max. power SWR 1:1: 1500 W
Max. power SWR 1:1.5: 1000 W
Max. power SWR 1:2: 750 W
Max. power SWR 1:3: 500 W
Connectors: “N”
By order: 7/16 DIN
Outdoor version: +9 EUR
With this equipment, the sequencer is mandatory. To switch from receiving to transmitting put on a sequencer 200 ms delay.
Outdoor version with IP63 protection.
EME3-70 Low Loss Bandpass Filter Low Noise Preamplifier Transmit/Receive High Power Relay Switches Block Diagram.
Our EME – Earth-Moon-Earth family. Band-Pass filters + Amplifiers + High Power Relays
6 meter band, EME2 – 50: EME2-50
6 meter band, EME3 – 50: EME3-50
4 meter band, EME2-70: EME2-70
4 meter band, EME3-70: This one.
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
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