Transmitting Schedule of VK2XV 136kHz LF Station
Schedule for 2009
The tables below show the scheduled transmitting times, transmitting mode and
frequency of the LF station operated under
the call VK2XV at maidenhead locator QF56ik.
Automatically refreshes every 5 minutes - but some browsers do not support
this and you may need to do it manually. If it is being
refreshed automatically the time below should change every 5 minutes or so.
NOTE: The time shown above relies on your PC time being correct....
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Planned Upcoming Events |
|
Date |
Time |
Frequency |
Mode |
|
None |
--- |
--- |
--- |
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Completed Events (last 90 days)* |
|
Date |
Time |
Frequency |
Mode |
|
Thursday, 6th August |
1830 AEST (0830Z) |
135.940kHz |
QRSS30 (100W) |
|
Thursday, 16th July |
1940 AEST (0940Z) |
135.940kHz |
QRSS30 (100W) |
|
Thursday, 9th July |
1940 AEST (0940Z) |
135.940kHz |
QRSS30 (100W) |
|
Sunday, 5th July |
0915 AEST (2315Z) |
135.940kHz |
Normal CW (100W) |
* See Logbook page for details of results
of these events (if any).
Estimated Station ERP (when operating)
Normal Speed CW:
Maximum Power to Antenna = 200W. Antenna current =
1.25A, modelled Rrad = 0.015 ohms
-> estimated ERP = about 20mW.
QRSS and Other Slow or Continuous Modes:
Maximum Power to Antenna = 100W. Antenna current =
0.9A, modelled Rrad = 0.015 ohms
-> estimated ERP = about 10mW.
Notes
Power to Antenna
The 'on-periods' for the slower QRSS modes are long relative to the time
constant of the heatsinks (QRSS30 means 90 seconds for the dashes) causing a
rise in the peak temperature of the amplifier FETs. Normal
speed CW is fast enough that the heatsinks smooth out the heat input and
therefore the heatsinks (and the FETs) stay at a lower maximum temperature. Perhaps forced air
over the heatsinks will allow 200W on the slower QRSS modes or continuous modes
(e.g., JASON) in the future.
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