Uputronics filtered preamp for improved Radiosonde/403MHz Reception


This is a 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 - See related items for a suitable USB Type A to Mini B Cable to power the unit.). A regulator is fitted as standard which means the bias-tee voltage input range is 5V to 26V. USB input is 5V.

The 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 Sonde frequencies (403Mhz).


The LNA used is a MiniCircuits PSA4-5043+ which provides at least 21dB of gain @ 403MHz. To stop out of band intermodulation an 403MHz SAW bandpass filter, which has a 15MHz bandwidth is also present. The insertion loss of this filter is approximately 2.3dB, which does increase the overall noise figure of the unit to 0.75dB.  Connectors are SMA female both sides.

Datasheet: 

403MHz Radiosonde Filter & Preamp For Dongles Datasheet

403MHz Radiosonde Filtered Preamp

  • Brand: Uputronics
  • Product Code: HAB-FPA403
  • Availability: 992
  • £46.79

  • Ex Tax: £38.99

Available Options


Related Products

SMA male to SMA female 90' Extender

SMA male to SMA female 90' Extender

SMA male to SMA female 90' adaptor suitable for linking your PCB to your antenna or mounting amps to..

£6.59 Ex Tax: £5.49

Mast Mountable Enclosure

Mast Mountable Enclosure

A mast mountable enclosure suitable for mounting up to two (possibly three) Uputronics LNA's on the ..

£41.99 Ex Tax: £34.99

USB2.0 Type A to Mini B Cable 1.8m

USB2.0 Type A to Mini B Cable 1.8m

USB 2.0 type A to mini B 5 pin data cable, this is to be used to transfer data, power and charge dev..

£3.59 Ex Tax: £2.99

SMA Plug / N Socket Interseries Adaptor

SMA Plug / N Socket Interseries Adaptor

This is a interseries adaptor SMA Plug to N Socket suitable for connecting our preamps N Plug ter..

£5.99 Ex Tax: £4.99

Tags: 403MHz Radiosonde Filtered Preamp