Never connect a transmitter directly to the tinySA, an external 60dB 10 watt attenuator would be a good place to start. Can get cheapies at Aliexpress and like someone else said check with a nanoVNA. Ham swap meets is another place to check, often able to pick up a directional coupler as a lot of people don't understand their function. The other potential problem is DC, not sure if the frontend of the tinySA has a cap to stop DC, but on HP and other Spec Analy it's common to use a DC blocker at the input. Eric would be able to answer this one.
I just received the TinySA Ultra.? ?As a first practical use, I want to measure spurious emissions from my various transmitters.? ?However, I understand that there is a maximum of -25dbm on the low input, and a maximum 30dbm internal attenuator.? By my calculations, this falls far short of even a 1w transmitter.??
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Am I correct in assuming that connecting a 1w transmitter (an HT, say) to the TinySA via SMA cable to the low input will be definition require a minimum of a 25dbm attenuator plus the internal 30dbm attenuator to get a 1w signal under the -25dbm low input threshold?
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