3 Jan 1994
Start Sounder. Slow attenuator relay in RF-module (Rx2) replaced
with new one.
5 Jan 1994
1403 UT, PC clock -3min 10s wrong since 12:46 UT. 14:46 UT clock
wrong by -2 min.
10 Jan 1994
Discovered that printer activity on other PC's affects DOS clock.
Disconnect printer interface (parallel port) and network.
12 Jan 1994
08:00-09:00 Clock was 9 secs late, corrected.
13 Jan 1994
08:00 Clock 4 s late
31 Jan 1994
Back in Tromso. Clock was about 2 min slow.
3 Feb 1994
Changed back to Owen Jones L-config. Re-connected MUX cables,
changed locals.dat etc.
Clock 33 secs slow, corrected at about 1800 UT
4 Feb 1994
Since reconfiguring the computers (22 Dec 1993) the 10 MHz ref to
CRAM board comes from a HP synth which does not appear to lock
correctly (?). Result is that the 100Hz PRF is not locked to EISCAT
so that PRE interference drifts in range.
0934 UT start B12min with original freq locling scheme.
7 Feb 1994
1953 Es up to about 14 MHz.
Japanese rocket launch. (CP3/7). Severe magnetic storm.
9 Feb 1994
Blackout.
10 Feb 1994
TV interference from dynasonde. Noticed that HPTx=0 dB !
Distorted RF.
PC clock about 30s slow, reset clock at 1805 UT.
17 Feb 1994
Recompiled crmck1v8.asm to use IRQ5.
18 Feb 1994
Changed wire on CRAM board from U23 pin 3, (B21, IRQ7) to
B23 (IRQ5).
19 Feb 1994
Clock nearly 50s slow. Reset at 1320 UT
20-21 Feb 1994
PCA event. Coherent echoes on VHF.
CP-7-F-2MS-V test on 20 Feb.
22 Feb 1994
Still high absorption. 1720 UT echoes reappearing.
25 Feb 1994
Ran Rxcals4. Similar Rx curve to that made by BAS people
in Sept 1993.
28 Feb 1994
Dynasonde data available on the WWW. !
17 March 1994
Shut down sounder 1657 UT
6 Apr 1994
Hardware HV holdoff changed from 120s to 90 s (R58 changed to
6.11MOhm from 7.5 MOhm)
Sporadic operation from 17 March to about 3 May 1994.
9 May 1994
Clock about 32s slow, corrected.
Installed low pass filter on output of A300 to
supress posssible harmonics.
Disturbed, much blackout.
13 May 1994
Heating and EISCAT VHF.
18 May 1994
Calibrations.
22 May 1994
Clock 11s slow, corrected 1052UT.
23 May 1994
Campaign with JWW, Francis Sedgemore etc.
26 May 1994
06:40 UT: Found HPTx off, HV fuse blown. Replaced.
10 June 1994
07:28 UT: Found HPTx off, HV fuse blown. Replaced.
22-23 Aug 1994
Ailtech synthesizer failed. An electrolytic Capacitor in power supply
failed. Replaced 2 of them. 10:05 UT on 23rd start soundings.
29-30 Sept 1994
Tests using Heater arrays 2 and 3 as receiving array for dynasonde.
18 Oct 1994
09:20-11:20 UT, A300 driver checked and repaired. Several bad solder joints found.
30 Oct 1994
API experiment
24 Oct 1994
PC clock 64 secs slow wrt UT. Reset clock.
4, 6 Nov 1994
Some magnetospheric radar exp, using Array 1 rows as Rx antenna.
between18 and 28 Nov 1994
Left Tromso until 31 Jan 95. Tiger & Stein running sounder.