- some notes on modifying surplus NERA PLL LO's for millimetrewave use (in Finnish)
- the DD8BD mixer concept (here for 76 GHz) appears to be a very easy way to get started on 122 and 241 GHz
- putting together hardware for 122 GHz, but still need to build the mixers and devise some antennas too
- this same topology will also be used for 241 GHz experimenting by simply using different LO's and a different highpass filter
- added a block diagram of an alternative LO concept for 249 GHz band transverters, with CB IF or with Belcom Liner 15 21 MHz IF
-obviously there will be reciprocral SSB phase noise issues on receive, but hey, this is amateur radio ;-)
- a photo of my first mixer and another photo of the active LO tripler with waveguide isolator and E-bend
- and an overall view of my experimental 122 GHz subharmonic mixer, DD8BD style
- experimental 120 GHz Gunn oscillator tests (blew my Gunn diode in the Autumn of 2010 - help anyone ?)
- feasability study and beginning experiments on EER/PLL-SSB for 75/120 GHz
- this is still ongoing with New Force, but now using the Bochum "Meinzer HELAPS/Bessel Method" of SSB generation
- even firing up some old Russian Klystrons for SSB doubling to 136 GHz and doubling to 122 GHz ;-)
- Considering an SSB tripler (43k) to 76.032 GHz using a DSP based constant amplitude SSB generator and envelope restorer - need DSP guru to join the team ;-)
- same block diagram, but for the 75.976 GHz (31k) band used in the UK