2m Super Low-Noise Preamplifier with 1500W T-R Relays EME2-144ExpQ 144-148MHz

A Comprehensive Solution for Highly Sensitive EME Signal Reception and DXing 2m Super Low-Noise Preamplifier with 1500W T-R Relays EME2-144ExpQ.

 

How to achieve the best possible preamplifier characteristics and the lowest possible noise figure?

Instead of following the standard procedure of manufacturing a 50-ohm band-pass filter and tuning the Qorvo Low Noise Amplifier (LNA) to match a 50-ohm impedance—while adding extra components that increase losses—we integrated a specially designed 2-meter input band-pass filter with internal tuning directly into the Qorvo device. This achieved an impressive input return loss of -25 dB without the need for additional tuning components. As a result, we realized extremely low input losses and the best possible noise figure.

The input bandpass filter will eliminate all out-of-band signals, so that even neighboring radio stations on 50MHz or 432MHz at a distance of only 300m will not interfere with reception on the 2m band.

 

Key Features:

• Frequency range: 144 – 148MHz
• Ultra-low noise figure of preamplifier: 0.22 dB
• The total NF, which includes the input circuit and bandpass filter: 0.37 dB
• Integrated 2m input bandpass filter with internal tuning into the Qorvo device. Input RL: <= -25dB
• High gain: 25.7 dB
• High linearity, +36 dBm Output IP3
• High input power ruggedness: 22 dBm CW
• Unconditionally stable
• Integrated ultra-powerful 1500 W Transmit / Receive relays
• Super low internal pass-through loss of just 0.03dB
• Transmit: Input RL: <= -35dB

 

2m Super Low-Noise Preamplifier with 1500W T-R Relays EME2-144ExpQ Appearance:

What does EME2-144ExpQ mean?

• EME – The preamplifier is intended for reception of the weakest EME and DX signals
• 2 – 2 connectors. Intended for standard (not modified) transceivers
• 144 – 2m frequency range from 144 to 148MHz
• Exp – EME Expedition version. With the highest sensitivity. Where every 0.1dB of reception improvement counts in increasing the number of QSOs
• Q – Integrated best of the best Qorvo LNA in DFN Package

 

2m Super Low-Noise Preamplifier with 1500W T-R Relays EME2-144ExpQ Internal Connection Diagram:

 

2m Super LNA with 1500W T-R Relays EME2-144ExpQ consists of:

• 144 – 148 MHz Super low-loss input bandpass filter internally matched to Qorvo LNA
• Qorvo Low Noise Amplifier
• Super high-power 1500W relays
• Isolation relays
• By-order fail-safe relay option for Advanced Sequencer

 

Receive gain:

1.8MHz -67 dB
3.5MHz -66 dB
7MHz -66 dB
14MHz -55 dB
21MHz -45 dB
28MHz -37 dB
50 MHz -20 dB
70 MHz -7 dB
144- 148 MHz +25.7 dB, NF 0.37dB, Input RL -25dB, IP3out 36 dBm
222 MHz 5 dB
430-450MHz -23 dB
1296 MHz -5 dB

 

Transmit side:

Antenna TX-RX Out: Return Loss: -35 dB, Insertion Loss: 0.03dB
Maximum power at SWR: 1:1 1500W, 1:1.5 950W, 1:2 700W, 1:3 500W
Power consumption: +12 V, 320 mA
Necessary Sequencer delay: 30 ms

 

2m Super Low-Noise Preamplifier EME2-144ExpQ Order Options:

• Outdoor housing (+12 EUR). The box used is “DB“
• Fail-safe Relay (+12 EUR). More explanations are here
• Gain Regulation (+7 EUR)
• 7/16 DIN connectors (+50 EUR)

Please specify the options you require in the order notes.

 

How to Effectively Use the EME2-144ExpQ?

When ordering EME2-144ExpQ, please also order the Advanced Sequencer. We will connect everything using 1m wires at no extra cost; you can extend them to your desired length if necessary. Doing so will prevent any possibility of burning out the preamplifier and ensure safe operation on EME and DX contests. If you use ICOM transceivers like the IC-9700, IC-905, IC-7610, IC-7300, or IC-7100, order an additional ALC board for added safety.

 

Connection possibilities to check:

Advanced-Sequencer Connection Possibilities EME2-EME3-CROSS-XPOL-Polarization-Switch-H-V-RHCP-LHCP (PDF)

To use the EME2, EME3, or EME4, as well as any other in-line preamplifier, the Advanced Sequencer is mandatory. Set the sequencer to a 30 ms delay.

 

2m Super LNA with 1500W T-R Relays EME2-144ExpQ Measured Characteristics:

2m Super LNA with 1500W T-R Relays EME2-144ExpQ Gain and Return Loss:

 

2m Super LNA with 1500W T-R Relays EME2-144ExpQ HF Suppression:

 

2m Super Low-Noise Preamplifier with 1500W T-R Relays EME2-144ExpQ 10m 6m 4m FM Suppression:

 

2m Super Low-Noise Preamplifier with 1500W T-R Relays EME2-144ExpQ UHF Suppression

 

2m Super Low-Noise Preamplifier with 1500W T-R Relays EME2-144ExpQ Transmit Insertion Loss and Return Loss

 

2m Super Low-Noise Preamplifier with 1500W T-R Relays EME2-144ExpQ Transmit SWR

 

Our complete EME2 -EME3 -EME4 family HF -23cm is here.