? ? ? I use a directional coupler when measuring the output of a transmitter.? The coupled port is -40dB down from the transmit level and the signal to the tinySA is well above its spur free range.?
? ? For protection when directly connected to other input sources, I purchased an RF Explorer power limiter which has a built-in power limiter, dc block and 6dB attenuator for input protection up to 30dBm.? Above 30dBm the power limiter becomes a sacrificial component rather than the tinySA.
? ? Both the directional coupler and power limiter were purchased to protect my higher priced spectrum analyzers.? They work just as well for the tinySA but each have the disadvantage of being priced at or above the cost of the tinySA.? The power limiter is spec'd to 3GHz which is over kill for the tinySA.? An interesting DIY project would be a power limiter or transient suppressor that only worked to the limits of the tinySA LOW or HIGH inputs.?
- Herb
