JG-ULNA137RX-E
Preamplifier for receiving NOAA and Meteor satellites operating in VHF on frequencies between 136 and 138 MHz.
The preamplifier, thanks to its flange, can be installed on a pole with a maximum diameter of 60mm.
Thanks to the waterproof box, you can install it outdoors.
The preamplifier has a high-Q band-pass filter at the input followed by a low-noise amplifier stage.
The filtering stage before the amplifier eliminates broadcasting frequencies 88-108MHz before they can be amplified, thus preventing intermodulation problems.
The preamplifier can be powered either via cable (bias tee) or via an external connector.
The power supply voltage can be from 4.5 to 16 Volts, while the power consumption is about 80mA. You can therefore power it via normal USB sticks with SDR technology.
There is also a relay that allows the preamplifier to be bypassed when turned off, thus entering bypass mode.
In addition to all this, there is a power limiting diode at the antenna input. This diode protects the preamplifier in case there are other transmitting antennas installed nearby.
After the limiting diode, there is a suppressor/ESD diode for protection against electrostatic charges.
Field of application :
Preamplifier, the first of its kind, with a high-Q band-pass filter designed exclusively for receiving NOAA and METEOR satellites in VHF from 137 to 138MHz.
You can connect your QFH, TURNSTILE or VERTICAL antenna directly to our preamplifier and install it underneath.
The bracket can be installed on tubes with a maximum diameter of 60mm.
Unique features :
High-Q band-pass filter at the input
Bypass relay
Output band-pass filter
Connectors :
High-quality connectors.
Input and output 50 Ohm: N female or PL
Power supply: Coaxial cable or via RCA connector
Materials :
Waterproof ABS box with brackets for clamping to poles up to 60mm mast diameter.
Technical Specifications :
Power supply voltage: 9-15V
Current: 130mA
Impedance: 50Ohm
Gain: +20dB adjustable from 0 to +20dB
OIP3: +28dBm
Noise Floor: approximately 2.30dB
