diff options
Diffstat (limited to 'README.md')
| -rw-r--r-- | README.md | 24 |
1 files changed, 15 insertions, 9 deletions
@@ -30,15 +30,6 @@ TODO before ordering the PCB * Put sidetone volume setting before RV303? * Hook up to LM375 BYPASS? -* Si5153 - * Check desired frequencies can be achieved: - * clk0: LO1 = 28 - 4.9152 + VFO - * clk1: VHF-LO = 144 + 28 and 144 - 28 - * clk2: BFO = 4.91521 - * See `freqplan.py` - * If not, generate LO1 and BFO with Si5153, and connect an external LO to the VHF LO u.FL - * No 116MHz crystals on mouser, but 114.285MHz are available, HF bandpass filters recalculated. - PCB Assembly Plan ================= @@ -77,3 +68,18 @@ PCB Assembly Plan 7. Mixer 7. External switching relay + + +Additional remarks +================== + +* Si5153 test before PCB fab: + * It seems the desired frequency plan can be achieved: + * clk0: LO1 = 28 - 4.9152 + VFO, i.e. from 23 to 25 + * clk1: VHF-LO = 144 + 28 and 144 - 28, i.e. 116 MHz + * clk2: BFO = 4.91521 + * See `freqplan.py` + * If not, generate LO1 and BFO with Si5153, and connect an external LO to the VHF LO u.FL + * No 116MHz crystals on mouser, but 114.285MHz are available, HF bandpass filters recalculated. + * Other option is using another configurable reference + |