We've just released two new products in our store. The first is a low cost general purpose wideband LNA and the second is some spare RTL-SDR V3 aluminum enclosures. The wideband LNA is currently available for shipping from our Chinese warehouse and will be available on Amazon in a few days time. It costs US$17.95 including worldwide free shipping. The spare aluminum enclosure is only available from our Chinese warehouse and costs US$5.95.
The Wideband LNA is based on the Qorvo SPF5189Z LNA chip (datasheet pdf) which has the following declared specs:
- Frequency range of 50 MHz to 4000 MHz
- Noise figure = 0.6dB @ 900 MHz
- OIP3 = 39.5 dBm @ 900 MHz
- P1 Saturation = 22.7 dBm @ 1960 MHz
- Gain = 18.7 dB @ 900 MHz
Compared to most of the other SPF5189Z LNAs found on eBay, our wideband LNA comes standard with a full conductive metal case, includes ESD protection on the antenna input, and is by default powered via 3 - 5V bias tee power. Our RTL-SDR Blog V3 dongles have a 4.5V bias tee built in, so they can be used to power this LNA. Direct power can be enabled simply by changing a jumper position, and removing the metal case.
This is a general purpose wideband LNA. It is useful for reducing the noise figure and thus increasing SNR, and for overcoming coax loss on all supported frequencies between 50 - 4000 MHz. However, because it is wideband you may need additional filtering if you have strong overloading signals in your area. If you're mostly interested in improving ADS-B reception, then we instead recommend our Triple Filtered ADS-B LNA which is also available at our store. The specs of the SPF5189Z are similar to that of PGA-103+ or PSA4-5043+ based LNAs. In the image slider below we compare the gain with the LNA4ALL which is a PSA4-5043+ based LNA.
Spare Aluminum Enclosure
The second product is some spare RTL-SDR Blog V3 aluminum enclosure. A few readers of this blog contacted us as they found RTL-SDR V3 enclosures to be a good fit (after being cut down to size) for home made filters, other LNAs and for FlightAware dongles. Our spare enclosures come with two SMA side panels, and one USB side panel. There is only limited stock of this product at the moment. Note that we're not including a thermal pad, since FlightAware dongles do not require additional cooling since they operate at 1.09 GHz. Additional cooling via thermal pad is only needed for stable operation when using RTL-SDRs above ~1.5 GHz.