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roh

  • Registered on: 02/18/2016
  • Last connection: 11/21/2019

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11/21/2019

02:21 PM m.2 (NGFF) WWAN modem USB breakout board Bug #4241 (Resolved): measure insertion loss for two alternatives of RF adapter on VNA up to 3GHz
new testrun with new pcb and new diodes:
D5 = ESDAXLC6-1BT2 - digikey# 497-13413-1-ND
D6 = SESD0402X1BN-0010-098 ...

10/25/2019

04:26 PM m.2 (NGFF) WWAN modem USB breakout board Bug #4241: measure insertion loss for two alternatives of RF adapter on VNA up to 3GHz
the next test was removing the esd protection diode, and the attenuation went away.
these are the amc3/umc3/hsc3 gra...
04:22 PM m.2 (NGFF) WWAN modem USB breakout board Bug #4241: measure insertion loss for two alternatives of RF adapter on VNA up to 3GHz
these 3 graphs just show a different mhf4-ufl cable being used
03:18 PM m.2 (NGFF) WWAN modem USB breakout board Bug #4241: measure insertion loss for two alternatives of RF adapter on VNA up to 3GHz
laforge wrote:
> * did you double-check / re-confirm the situation with the improbable high loss of the converter in...

10/24/2019

06:17 PM m.2 (NGFF) WWAN modem USB breakout board Bug #4241: measure insertion loss for two alternatives of RF adapter on VNA up to 3GHz
sorry, this should fix it.
03:26 PM m.2 (NGFF) WWAN modem USB breakout board Bug #4241: measure insertion loss for two alternatives of RF adapter on VNA up to 3GHz
i think this is just a minor calibration error:
* i was not redoing calib but loading a saved one
* the calib was...

10/23/2019

03:40 PM m.2 (NGFF) WWAN modem USB breakout board Bug #4241: measure insertion loss for two alternatives of RF adapter on VNA up to 3GHz
results:
* the ufl pigtail performs best with a performance of 0.2-0.3dB insertion loss over the whole band.
* umc ...
03:25 PM m.2 (NGFF) WWAN modem USB breakout board Bug #4241 (Resolved): measure insertion loss for two alternatives of RF adapter on VNA up to 3GHz

10/22/2019

02:58 PM OsmocomBB Support #2704: set up FCDEV1B board so it can be remotely accessed remotely
not active yet - waiting for mechanics (rack)
11:40 AM OsmocomBB Support #2704: set up FCDEV1B board so it can be remotely accessed remotely
installed a apu on 10.9.25.60

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