Getting strange frequency offset on 70cm, for example my local DMR tower is on 439.312500 but with lime it shows up at 439.318600 (with my rtlsd+tcxo shows up in right place.) It’s constant, whatever I tried (eg. another laptop, gqrx, sdrsharp, sdrconsole, windows/linux as host, cooling check, vco/nco tuning, antenna change etc. Also the FM band seems ok. Any suggestions pls?
Hmm, still not perfect, but if I downgrade from 2.19 to 2.18 fw, getting less shift…
This is probably within the specified internal clock deviation. You can correct clock offset in software with an adjustment expressed in parts per million (ppm). I think the device also has an input for external GPSDO if you need such precision, although usually just correcting the deviation in software is enough for most applications of this type.
…with 2.18 gw I think it’s within the specs, but with 2.19 it seems much worse.
Hi @Yume,
Could you read VCTCXO DAC value using LimeSuiteGUI (board related controls menu item) for both gateware version, please.
With the 2.18 gw 125/7
2.19 gw it’s 7/7
Same temp around 40C’
Enter “125” value to “VCTCXO DAC (permanent)” edit box and push “Write” button next to it. This will fix the issue.