Low Noise Preamplifier EME2-222 Transmit Receive Relays 219-225MHz

A Complete Solution for 1.25m Band Low Noise Preamplifier EME2-222 Transmit Receive Relays 219-225MHz. Maximum through power 1300 W. Excellent for competitions and Moon bounce – EME. Integrated super low loss input bandpass filter that will prevent preamplifier overload by out-of-band signals. QRO made on super low dielectric loss RT/duroid® 5880 Laminates (not on FR4). 

 

Low Noise Preamplifier EME2-222 Transmit Receive Relays 219-225MHz

Low Noise Preamplifier EME2-222 Transmit Receive Relays consists of three components:

• Super low loss band pass filter on the input side of the preamplifier
• Wideband Low Noise Amplifier
• High Power High Current Relays + isolation relays.

Options by order:

• Outdoor mounting IP63 protection.
• Gain regulation.
• Fail-safe relay option.
• 7/16 DIN connectors instead of “N”

 

Low Noise Preamplifier EME2-222 Transmit Receive Relays receive gain:

1.8 – 30 MHz -60 dB
50.1 MHz -48 dB
70 MHz -38 dB
88 MHz -30 dB
108 MHz -23 dB
127 MHz -16 dB
144 MHz -10 dB
219 -225 MHz +23.5 dB, NF= 0.7 dB, Input RL -15 dB, IP3out >37 dBm
432 MHz -37 dB
666.3 MHz -37 dB
888 MHz -42 dB
1296 MHz -20 dB
Delay 150ms.
Transmit: Input RL: <= -35dB, Insertion loss: 0.07dB
Maximum power input at SWR:
1:1 = 1300 W; 1:1.5 = 850 W; 1:2 = 600 W; 1:3 = 450 W
Power consumption +12 V, 300 mA

 

EME2-222 219-225MHz Filter Preamplifier Relays Internal Schematic

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.

 

Low Noise Preamplifier EME2-222 Transmit Receive Relays HF Attenuation

 

Low Noise Preamplifier EME2-222 Transmit Receive Relays 6m 4m FM Attenuation

 

 EME2-222 Transmit Receive Relays Gain Characteristics

 

EME2-222 Transmit Receive Relays Transmit Side. Super low insertion loss.

 

Our EME preamplifier high power relays family:

6m band, EME2–50N
6m band, EME3-50
4 m band, EME2-70
4 m band, EME3-70
1.25m band, EME2-222 (this one)
1.25m band, EME3-222 (soon)
2m band, EME2-144
2m band, EME3-144
70cm band, EME2-432
70cm band, EME3-432
3Band EME2 144MHz 222MHz 432MHz