MJLorton Solar Power and Electronic Measurement Equipment Forum
HAM Radio => HAM Radio => Topic started by: Jason on June 23, 2013, 07:19:30 PM
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Hi Martin
Just a quick though now that you are back in the states I guess you now have the licence to transmit HAM frequencies again. It might be a really cool idea to try an Earth-Moon-Earth (EME) propagation transmission to perhaps someone you might know in South Africa. Or even just a HF chat with one of your followers on YouTube. The technical aspects of it would potentially be very interesting to some with either the moon bounce or a standard HF chat. Just a thought. :)
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Hello Jason,
My HAM kit should be with me in the next 3 weeks....dreading trying to find space in my lab for it!! But I will pop back onto the air waves once I figure it all out again.
The EME has been suggested to me as at a technical "HAM" challenge and I really like the idea...so watch this space...at some point in time I'll give it a bash.
Thanks for the prod.
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Hello Jason,
My HAM kit should be with me in the next 3 weeks....dreading trying to find space in my lab for it!! But I will pop back onto the air waves once I figure it all out again.
The EME has been suggested to me as at a technical "HAM" challenge and I really like the idea...so watch this space...at some point in time I'll give it a bash.
Thanks for the prod.
Good I'm pleased your joining the ranks of us radio hams again, The USA is easy to get for us in the UK, like having a free phone call with friends, you could have your on Net ,that would be good.
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Maybe one of you can help. I remember when I was learning radio propagation for my GMDSS radio licence that they thought us a really simple way to calculate the transmission distance of a said HF frequency. However I no longer remember the rule of thumb, something about dividing the frequency by 8 during the day and divide by 4 at night. Have you heard about this quick guide? I may not be remembering correctly.
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Maybe one of you can help. I remember when I was learning radio propagation for my GMDSS radio licence that they thought us a really simple way to calculate the transmission distance of a said HF frequency. However I no longer remember the rule of thumb, something about dividing the frequency by 8 during the day and divide by 4 at night. Have you heard about this quick guide? I may not be remembering correctly.
No exams were far to long ago for me to remember that, however this maybe helpful http://ve2xip.cactus.net/?p=1526
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Thanks Paul that was a great refresher and seems to confirm my general rule of thumb. At night when operating on 10Mhz you would expect a range of approximately 2, 500 miles because 10, 000 ÷ 4 = 2, 500. Where as during the day on the same frequency you wound expect a range of approx 1, 250. It's not the most accurate calculation but it gives you an idea of what frequency you need if you want to reach a specific country for example using sky wave.