EME3-432 – A Complete Solution for 432 MHz 1200 W Transmit-Receive 70 cm Contests and EME with Split RX

QRO – Extreme power on transmit and super low noise on receive with integrated Input band-pass filter. Three connectors. Separate receive and transmit connectors.

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

 

EME3-432 device consists of three components:

1. 70 cm 430 – 440 MHz Ultimate Receiving Bandpass Filter on input side.
2. Wideband Low Noise Amplifier.
3. High Power High Current Relay + isolation relay.
4. By order, SAV-541+ instead of PGA103+
5. By order, Fail Safe Relay option.
6. By order, integrated super high selectivity SAW filter with a bandwidth of just about 8 MHz. From 430-438 MHz.

Receive gain:

Frequency and Gain:

1.82 MHz: < – 60 dB
3.80 MHz: < – 60 dB
7.1 MHz: < – 60 dB
14 MHz: < – 60 dB
28 MHz: < – 53 dB
50 MHz: < – 38 dB
70 MHz: < – 30 dB
144 MHz: < – 13 dB
148 MHz: < – 12 dB
432 MHz: +19.7 dB, NF= 0.68 dB, Input RL= -14 dB, IP3out > 37 dBm
440 MHz: +19.7 dB, NF= 0.68 dB, Input RL= -14 dB, IP3out > 37 dBm
450 MHz: +19.7 dB, NF= 0.68 dB, Input RL= -14 dB, IP3out > 37 dBm
930 MHz: < – 19 dB (GSM)
1296 MHz: < – 26 dB

Extreme Low Loss on the transmit side thanks to RT/duroid® 5880 Laminate. About 0.06 dB.
With Excellent Wideband Return Loss 432 – 450 MHz -33 dB.

Transmit side of EME3-432. Measured Insertion Loss and Return Loss:

Frequency:	Input Return Loss (S11):	Insertion Loss (S21):
432 MHz	< – 34 dB	0.06 dB
450 MHz	< -41 dB	0.07 dB

Gain about +20 dB, NF= 0.68 dB, Input RL= -14 dB, IP3out > 37dBm

70 cm EME3-432 Split RX Transmit / Receive Relay PGA103+ or SAV-541+ BPF Filter VLNA Power 1200W Measured HF 6m 4 m Gain (S21)

EME3-432 70 cm Split RX Ultimate T/R Relay Switches low Loss Band Pass Filter VLNA PGA103+ or SAV-541+ Measured 6m 2 m 70 cm Harmonic 23 cm Gain

Important details:

Power consumption: + 12 V, 200 mA
Max. power SWR 1:1: 1200 W
Max. power SWR 1:1.5: 1000 W
Max. power SWR 1:2: 600 W
Max. power SWR 1:3: 400 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 150 ms delay.
Outdoor version with IP63 protection EME3-432 Outdoor:

EME3-432 Super Low Noise Preamplifier With Extreme Low Loss Band Pass Filter PGA103+ or SAV-541+ Split RX. Max Power 1200 W Transmit Receive Relays 432 to 450 MHz Block Diagram.

 

 

How to properly connect any EME2 or EME3 for any band to the sequencer?

Use these schematics. Quality sequencer is mandatory.

 

How does the fail-safe option work?

Fail-safe relay is the possibility to have information, on did EME2-432 is switched to transmit position or not.
In that situation, the additional Fail Safe “FS” relay will switch to ground or not an additional line.
That information sequencer could be used to take another step in switching linear amplifiers or transceivers.

If by chance +12V was not disconnected from EME2 (receive position) linear amplifier will not burn the preamplifier, because the sequencer will not have information that the EME2 fail-safe relay is switched.

Summary: With a fail-safe relay, a linear amplifier or transceiver will never burn the preamplifier because of any problematic situation.
It could work only if the sequencer has an input port for a fail-safe relay (line). And logic to use it.

 

Our EME – EME family. Band-Pass filters + VLNA + Transmit Receive 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: EME3-70

2 meter band, EME2-144: EME2-144

2 meter band, EME3-144: EME3-144

70 cm band, EME2-432: EME2-432

70 cm band, EME3-432: