Thread: NVIS and VHF?
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Old May 27th 11, 04:07 AM posted to rec.radio.amateur.antenna
Wimpie[_2_] Wimpie[_2_] is offline
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First recorded activity by RadioBanter: Mar 2008
Posts: 329
Default NVIS and VHF?

Hello Kirk,

I sent you a PM with a result from Radio Mobile.

It took a long time to get RMW working, and getting the terrain data
into the SW.

It is 10 years ago that I used RMW and that computer I don’t have
anymore. I had to start from scratch. First checked with Dutch terrain
data to see whether the results are meaningful.

When you look to the path profile, you have a huge margin (received
power -76 dBm). I used 10W into a 2 dBi antenna (on both sides). I
attached the path profile as generated by RMW (Personal Mail only).

Even reducing your antenna height to 1m AGL gives sufficient margin
(Prx -86 dBm). I used 30m AGL for the repeater antenna. You have 1
degree elevation towards the repeater, that is huge (we don't have
that in the Netherlands).

Assuming the data is correct, it is really strange that you can't hit
the repeater. I couldn’t find were to set vegetation and cities, but
even this shouldn't be a problem. I hope some other people can confirm
the results from RMW.

With kind regards,


Wim
PA3DJS
www.tetech.nl