I tried to create some fast and/or high voltage pulse generators using either avalanche pulse generation, tunnel diodes, snap diodes or transistor circuits.
I added a page showing filter/equalizer networks for LFSR based noise generators. The circuit worked fine and supressed unwanted harmonics and flattened out the frequency response in the passband
This amp now got an active bias stabilizer to fix its ideal operating point.
It worked fine after the emitter RFC was changed from a moulded choke to a VHF choke with 6 turns (standing upright here).
A lot of my ham colleagues have a budget spectrum analyzer like the DSA815, but no possibility to make noise measurements due the high noise floor of this entry level instrument. Using some additional, not too complicated hardware it is possible to do accurate noise measurements with it, nevertheless.
It works by using a noise source, an LNA and two transfer switches.
I updated the IQ Modulation Quality Pages to reflect the latest discussions with RIGOL. It seems that the problems found were not specific to my DSG3060-IQ. A final statement from RIGOL China is still outstanding.
Today I added some pages about the high voltage power supplies I have made.
They contain photos of the interiors, schematics and design considerations.
Have fun – but play safe !!!
I added a page about a PIN diode switch I have built and its characteristics.