09-12-2021, 18:14
I can confirm regarding LO & FI selection for XP version. Best Rx gain and Tx spurious rejection are achieved with LO 1808.166MHz/~0dBm and Rx/Tx FI 2350Mhz. The Rx gain seems to flat between 2100...2600MHz and drop under 2100MHz.
Poor results observed with LO 909MHz, Rx gain not very good and abnormal spurious Tx output on spectrum analyzer, even the bolometer power indication and internal monitoring voltage are normal, critical LO level.
More details: https://www.qsl.net/yo4hfu/Link_23GHz.html
The project is under construction, higher FI gain and some small modification are necessary.
Poor results observed with LO 909MHz, Rx gain not very good and abnormal spurious Tx output on spectrum analyzer, even the bolometer power indication and internal monitoring voltage are normal, critical LO level.
More details: https://www.qsl.net/yo4hfu/Link_23GHz.html
The project is under construction, higher FI gain and some small modification are necessary.