Adding an LNA

Sometimes you need a bit more sensitivity while still being portable. This is easily done through one small modification of the tinySA

Start with soldering a single female Dupont connector to one of the Vdd points at the edge of the PCB.

attachment:dupont.jpg

Warning: Maximum current drawn is 100mA. Monitor the temperature of the tinySA, if hot, switch off. Too much current drawn will destroy your tinySA

Next is to make a small hole for the Dupont connector and put the tinySA back into the housing.

attachment:housing.jpg

After connecting a cheap LNA that gives 30dB amplification without noticeable noise and setting the RBW to 3kHz the noise floor is at a whopping -135dBm and the -80dBm signal is clearly visible. Be aware the LEVEL/EXTERNAL AMP setting is used to cater for the applied amplification so the displayed levels are still correct.

attachment:low_signal.jpg

Combined with the small telescopic antenna the tinySA is ready to do some QRM hunting

attachment:hunt.jpg


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TinySA-LNA (last edited 2020-10-16 14:04:52 by RudolfReuter)