#RIGOL DSA815 SAVE PICTURE HOW TO#

Hence, my bet is that it's an NPN transistor.

And then, there's three 10 Ohms resistors in parallel to ground connected to the terminals where one would expect the emitter of an NPN RF transistor in the aforementioned package.

Moreover, the pinout is rather uncommon for a typical SOT-343 gain block. Ted - to me the U120 device rather looks like an RF transistor (similar to a BFP780) since there's a bias voltage divider at the input (150/75 Ohms), usually not to be found around MMICs. 4.) Frequency Deviation Measurement with an RTL-SDR Dongle (as a Spectrum Analyzer): Perhaps this may be of interest if you don't have a Spectrum Analyzer. This is also a nice introduction to AM, FM, and Bessel Null Frequency Deviation Measurement. 3.) TRX Bench - #166 FM modulation and deviation on the spectrum analyzer explained. This video uses a CW receiver, although it is easier to use a Spectrum Analyzer instead.

#RIGOL DSA815 SAVE PICTURE HOW TO#

2.) W2AEW - #101: How to measure FM Frequency Deviation without special equipment using Carrier-Bessel Null. For a accurate measurement of FM Frequency Deviation you would want to use a Bessel Null Measurement as follows below in items 2.) and 3.). 1.) W2AEW - #159: How to measure FM frequency deviation with a spectrum analyzer. Of course a Frequency Counter would not be applicable for FM Deviation measurement covered here. And to do that, you need to use a qualified RF Frequency Counter. And as I tried to make clear in the procedure I provided for 'DSA800 Frequency Standard Calibration' (Reply #954 above), is that the DSA800 Marker does not provide an accurate method for determining a precise RF frequency. W2AEW states that his procedure below in item 1.) is for determining a Quick Estimation of FM Deviation. FM Frequency Deviation Measurement: General information for those interested.

Rigol dsa815 save picture