SAWbird LNA Filters

This FAQ pertains to Nooelec's own SAWbird LNA filter series. If you are looking for information on a different series or device, look for the appropriate FAQ on the left!

The following questions pertain to all models of the SAWbird series. Scroll down to see the list of features and specifications for each SAWbird model.

What are the SAWbird LNA filters used for?
The SAWbird series are combination LNA (low-noise amplifier) and SAW filters. Their primary purpose is to amplify weak signals within their frequency range. These devices make an excellent add-on for satellite applications. Our current product offering includes SAWbirds for: GOES, NOAA, Iridium, Inmarsat, and Hydrogen Line or radio astronomy applications.

What are the differences between each of the versions of the SAWbird?
Broadly speaking, each of the models in the SAWbird series is best suited to a specific satellite application:

• SAWbird/SAWbird+ GOES - GOES/LRIT/HRIT 
• SAWbird/SAWbird+ IR - Iridium and Inmarsat
• SAWbird/SAWbird+ iO - L-Band, Inmarsat AERO/STD-C
• SAWbird+ NOAA - NOAA, near 137 MHz
• SAWbird+ H1 - Hydrogen Line, near 1.42 GHz

A full breakdown of the individual features for each model and version are included in the tables below.

What is the difference between the standard and plus (+) versions?
Some of the SAWbird filters come in two versions, a base model and a plus (+) model. The primary differences between these two versions are the nominal current draw and gain. The + versions offer at least an additional 10 dB of gain, however require more power from the SDR bias tee or external power supply. The exact specifications of each unit are listed below.

The SAWbirds for NOAA and Hydrogen Line applications are currently available in + models only.

How can I power the SAWbird LNA filter within my application?
All models have 3 different power options including the female SMA output port, micro USB port, and power input header (female 0.1” header). The recommended external power input for all models is 3.3V-5.5V DC. Please note that while there are 3 power options available, you should only use one at any given time.

Which side of the filter is used for input/output?
Every SAWbird filter has the same orientation. When looking at the SAWbird, with the logo facing you, input (for your antenna) is on the left, and output (for your SDR) is on the right. If you have a barebones version of the SAWbird (any version), you should be able to see "input" and "output" markings on the PCB.

Why can't I use my NESDR SMArt with the SAWbird filters?
Certain SDRs, like previous versions of the NESDR SMArt (not including the current production version, v4), may have their ESD protection diode tripped by the LNA when powered externally. You can still use the LNA with these SDRs of course, but you would need to install a DC block between the LNA and SDR. This can be as simple as a low-distortion, high-quality capacitor in series with the RF path, should you prefer a DIY solution. We also sell an affordable DC block in our webstore. Alternatively, you can power the LNA with a bias tee capable SDR like the NESDR SMArTee or NESDR SMArTee XTR.

SAWbird GOES

SAWbird IR

SAWbird iO

SAWbird + NOAA

This version of the SAWbird is available in '+' model only.

SAWbird+ H1

This SAWbird is currently available only in '+' version. See the comprehensive datasheet for this product here.

SAWbird+ 2m

This SAWbird is currently available only in '+' version, barebones. 

Can’t find the information you need? Contact our friendly Customer Support Team using the Support chat window in the bottom-right corner of the page. One of our Customer Support Specialists would be happy to assist you!