Dynasonde diary

2017

• 29 March 2017
  Noticed Tx attenuation is 15 dB ! It should be 4 with HPTx and 0 with LPTx. Probably like this for some time. It says 4 dB in the header.
  HV has been on now very long, since 10 March !.
• 03 April 2017
  Fixed DIO interface board. A faulty latch chip DM8553 ?? was replaced. Similar to a fault on an adjacent chip which was fixed in April 2010 by Arild. See circuit diagrams HFS134 and HFS135 for details.
• 28 May 2017
  06:49 UT the receiver failed. Power supply problem
• 29 May 2017
  Dynasonde stopped soundings about 0928 UT.
• 07 June 2017
  Receiver power supply fixed, by temporarily replacing the NFS350 series supply (failed) with an old PC power supply. First sounding number repeated twice. Running with HV, BPG every 2 minutes.

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