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 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
3. . Double High Power Relays with 16A contacts.
Receive gain:
| Frequency: | 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 transmit side thanks to RT/duroid® 5880 Laminate. Less than 0.04 dB.
With Excellent Wide-band Return Loss 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, sequencer is mandatory. To switch from receiving to transmitting put on 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
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