Uputronics filtered preamps for improved reception on 137.5Mhz. This unit is built to order so may be subject to longer lead times.
This is a cost effective SAW based unit which give excellent performance gains.
All our preamps are compatible with most USB SDR Dongles such as the RTL USB, Airspy, Fun Cube. You can power them from either bias tee (This item is 100% compatible with the Airspy bias-tee) or a simple USB minicable (Not Supplied). Bias tee/USB voltage is 5V max unless the optional (see related items) LDO kit is fitted which takes it to 26V.
This unit is a small filter and preamp designed to go between a software defined radio receiver and an antenna. Using a SAW bandpass filter and a low noise amplifier (LNA), it stops out of band intermodulation while providing additional gain for increased sensitivity. The LNA is before the SAW filter. This particular model is tuned for use with 137.5MHz. To block strong commercial FM signals a high pass filter is installed before the LNA.
The LNA used is a MiniCircuits PSA4-5043+ which provides at least 21dB of gain @ 145MHz. To stop out of band intermodulation an 137.5Mhz SAW bandpass filter, which has a 7.6MHz bandwidth is also present. The insertion loss of this filter is approximately 1.4dB, which does increase the overall noise figure of the unit to 0.75dB. Connectors are SMA female both sides.
Datasheet: 137.5MHz Filtered Preamp Datasheet
137.5Mhz NOAA/APT Filtered Preamp
- Brand: Uputronics
- Product Code: HAB-FPA1375
- Availability: 3
- Ex Tax: £36.99
Tags: 137.5Mhz Filtered Preamp