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Old 06-06-2008, 12:03 AM   #1
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The problem facing communication via HF radio at this time - this year, is the result of poor propagation on the frequencies used by cruising yachts - be they Ham or Marine band frequencies.

I reproduce 2 charts from HFRadio to illustrate the difficulty in finding what are termed MUFs (Minimum Useable Frequencies)

Our Planet's cycle for efficient radio communication is just leaving the bottom of the trough - the charts show a gradual but steady improvement through to the end of 2011 ( after that the improvement will continue to complete another 11 year cycle.

So what does this mean to a cruising yacht who is trying to talk to a maritime net or another cruiser, or who is trying to send and receive emails, or trying to receive weather information?

It will mean that at certain times of the day (or night) frequencies that have been allocated for specific purposes will not function sufficiently well enough to send or receive voice or digital traffic - therefore, by referring to Regional Optimum frequency (FOT) charts , one may have to communicate at times irrespective of what other members of the crew are doing - eg snoring at 3am local .

Prop3.jpg

Richard
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Old 06-06-2008, 01:34 AM   #2
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Thanks for the explanation. I can vouch that it was very frustrating trying to connect somewhere between Kavieng, PNG to Palau and to Mindanao, especially when it was very very hot inside the boat. I could get weatherfax from Hawaii but could not get anything out of Tokyo. Winlink? I gave up trying.

Ellen
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Old 06-06-2008, 03:01 AM   #3
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Ellen,

Here is a Cruiser Log post on Winlink that you might like to reference :-

Winlink Jakarta

PS, unfortunately, there is a small problem of Borneo - which lies between Mindanao and Java ! but you never know.

Richard
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Old 06-07-2008, 12:24 AM   #4
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Hi Richard,

Yes I tried that station. Our cruiser friend was succesful with it, but he has more patience trying and trying. He told me what time of the day he was successful and then, the following day, he said that time didn't work anymore.

Ellen
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Old 06-07-2008, 08:49 AM   #5
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Ellen, Have you tried VU2GMN in Chenai (Madras) Indian

Pactor III

Winlink 2000 pactor station position/status reports

Status report for VU2GMN

07 June 2008 22:37

Received Sat, 07 Jun 2008 08:37:00 UTC

Grid Locator NK03DA

24-Hour activity

Mode Connects Minutes

Telnet 0 0

Packet 0 0

Pactor I 0 0

Pactor II 0 0

Pactor III 19 8

Traffic Volume 90 KB
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