2m LNA For 1500W Linear Amplifiers T-R Relays EME4-144EXP 144-148MHz

2m LNA for 1500W Linear Amplifiers T-R Relays EME4-144EXP 144-148MHz is a complete solution for 2m linear amplifiers if you are building your own 144-148MHz 1500W power amplifier or want to eliminate weak internal relays in factory linear amplifiers with real 1500W relays.

The internal super low-loss bandpass filter is the same as in the famous EME2 – EME3 line, with extra-quality capacitors with a Q factor greater than 3000 at 144MHz and coils with a Q factor greater than 500 that enable the EME line of preamplifiers to have super low insertion loss and very low noise characteristics (high sensitivity) with maximum suppression of all out-of-band signals. 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 100m will not interfere with reception on the 2m band.

How everything is connected in EME4-144EXP:

On the transceiver side, an internal 1500W relay in the “NC” (Normally Closed) position switches the signal to the linear amplifier (PA). The linear amplifier output is also connected to the “NC” side of the 1500W relay and forwards the signal to the antenna.
At reception, 12 to 13.6V is supplied to the EME4-144EXP, and the 1500 W relays are switched via isolation relays to an input band-pass filter and a low-noise preamplifier to boost weak DX and EME signals.

2m LNA For 1500W Linear Amplifiers T-R Relays EME4-144EXP Connections

2m LNA For 1500W Linear Amplifiers T-R Relays EME4-144EXP Appearance:

2m LNA For 1500W Linear Amplifiers T-R Relays EME4-144EXP

2m Ultimate Transmit-Receive Relay Switches BPF VLNA EME2-144EXP consists of:

144 – 148 MHz High Selectivity, High Q, Low Loss RX Bandpass Filter BPF
Wideband Low Noise Amplifier
Super high-power relays
Isolation relays

Receive gain:

1.8- 14MHz < -64dB
21- 28MHz < -50dB
50 MHz -35 dB
70 MHz < -24dB
144-148MHz +25dB, NF= 0.6dB, Input RL= -14dB, IP3out >37dBm
222 MHz < -14dB
430-450MHz -33 dB

Transmit side:

Transceiver – Linear-IN Return Loss: -35 dB, Insertion Loss: 0.02dB
Transceiver – Linear-IN SWR: 1.03
Antenna – Linear-OUT Return Loss: -35dB, Insertion Loss: 0.02dB
Antenna – Linear-OUT SWR: 1.03
Maximum power at SWR: 1:1 1500W, 1:1.5 1000W, 1:2 750W, 1:3 550W

Power consumption: +12 V, 360 mA
Necessary Sequencer delay: 30 ms

2m LNA for 1500W Linear Amplifiers EME4-144EXP Order Options:

Outdoor housing (+12 EUR). The box used is “DB“
Fail-safe Relay (+12 EUR). More explanations are here
Gain Regulation (+7 EUR)
Two 7/16 DIN connectors (+50 EUR for Antenna and Linear OUT side) + 2 x “N” linear IN and transceiver

Please specify the options you require in the order notes.

When placing an order, if the EME4-144EXP is purchased with the Advanced Sequencer, we will connect all with 1m wires at no additional cost. You will only need to extend them to your desired length if necessary

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. Put on Sequencer 30ms delay.