Universal 3Band EME2 144MHz 222MHz 432MHz Filter Preamplifier Relays for 2m, 1.25m, and 70cm Terrestrial Contesting and EME

Integrated low-noise preamplifier with powerful transmit/receive relays on all three bands. Use this 3Band EME2 144MHz 222MHz 432MHz Filter Preamplifier Relays for any kind of terrestrial or EME communications. JT65, FT8 CW, FM, or SSB. Integrated super low loss input bandpass filter that will prevent overloading of any HF, 6m, 4m, or 23cm stations. Super low noise preamplifier will allow you to hear even the weakest signals. QRO made on Rogers RF Laminates.

This universal preamplifier is an excellent solution for any 2m antenna, dual-band 2m 70cm antenna, 1.25m antenna, and 70cm antenna

 

Universal 3Band EME2 144MHz 222MHz 432MHz Filter Preamplifier Transmit/ Receive Relays appearance

 

3Band EME2 144MHz 222MHz 432MHz Filter Preamplifier Relays consist of:

• Super low loss input bandpass filter. The loss of the filter is about 0.1dB
• Low noise preamplifier
• High Power transmit/receive relays
• By order, the Fail Safe Relay option

 

Receive gain on Universal 3Band EME2 144MHz 222MHz 432MHz Filter Preamplifier Relays:

1.8 MHz –63 dB
3.8 MHz –62 dB
7.02 MHz –62 dB
14.02 MHz –59 dB
21.02 MHz –53 dB
14.02 MHz –59 dB
28.4 MHz –58 dB
50.11 MHz –28 dB
70.2 MHz –7 dB
144-148 MHz +25 dB, NF=0.6 dB, Input RL -10 dB, IP3out >37 dBm
219-225 MHz +23.8 dB, NF=0.6 dB, Input RL -15 dB, IP3out >37 dBm
430-450 MHz +20 dB, NF=0.65 dB, Input RL -12 dB, IP3out >37 dBm
720 MHz –16 dB
864 MHz –31 dB
930 MHz (GSM) –35 dB
1296 MHz –26 dB

Power consumption: + 12 V, 340 mA
Transmit delay: 30 ms
Transmit path: RL≤ -34dB, Max SWR ≤1.04, Insertion Loss ≤ 0.1dB

2m Maximum power input at SWR 1:1 1500W, 1:1.5 950W, 1:2 700W, 1:3 500W
1.25m Maximum power input at SWR 1:1 1300W, 1:1.5 1000W, 1:2 650W, 1:3 450W
70cm Maximum power input at SWR 1:1 1200W, 1:1.5 1000W, 1:2 600W, 1:3 400W

Connectors: “N” (by order: 7/16 DIN)
Outdoor version: +12 EUR
Fail-safe option: +12 EUR

 

How does the fail-safe option work?

A fail-safe relay is the possibility of having information on whether or not EME2-432 is switched to the transmit position.
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.

With any preamplifier, a sequencer is mandatory. Use this schematic. Put 30 ms delay.

 

Measured results on universal 3Band EME2 for 2m, 1.25m, and 70cm

Universal 3Band EME2 HF Attenuation

 

Universal 3Band EME2 2m, 1.25m, 70cm Filter Preamplifier Relays 10m 6m 4m Attenuation

 

3Band EME2 144MHz 222MHz 432MHz Filter Preamplifier Relays Gain

 

Universal 3Band EME2 144MHz 222MHz 432MHz Filter Preamplifier Relays Harmonics 23cm Attenuation

 

3Band EME2 144MHz 222MHz 432MHz Filter Preamplifier Relays Transmit Side SWR

 

Our EME2 – EME3 complete family 8m – 23cm is here.