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Hello, fellow amateur radio scientist (and, you know you are one -- if you
think about it. Or, at least you could call yourself an amateur radio
propagation observer. However, I understand that a "scientist" is one who
observes and draws conclusions from said observations).
I'm letting this group know about some additions to my website
( http://hfradio.org/ ). These new pages contain information that many
radio operators will find useful (based on the feedback I have gotten from
this material when the original was published in CQ Magazine and Popular
Communications Magazine).
One would think that ionospheric radio propagation would be reciprocal.
That is, the signal strength in one direction should be the same as in the
reverse, or reciprocal, direction. In HF ray-trace theory, the distance is
the same and the ionospheric control points-the points where the wave is
reflected (or more properly, refracted) back to the ground-should be the
same. This is an interesting topic for those using very low power, for
example. Can your signal be heard well at the distant station, and can it
compete with other signals that might be originated with a higher energy
level?
I explored this (is HF propagation reciprocal?) in a recent CQ Magazine
"Propagation" column. I've posted the meat of the text at:
http://hfradio.org/ace-hf/ace-hf-reciprocal.html
I've also posted another recent CQ Magazine "Propagation" column, where I
explored basic HF propagation concepts (De-mystifying HF signal
propagation).
You can find it here:
http://hfradio.org/ace-hf/ace-hf-demystified.html
I'm working on posting additional texts where I take various HF
propagation topics, and use modern software to model the concepts. I hope
that this is helpful to those of you wishing to dig deeper into space
weather and radio signal propagation (especially on HF).
73 es gud DX
Tomas Hood / NW7US / Heliophile
: Propagation Editor for CQ, CQ VHF, Popular Communications :
: Associate Member of Propagation Studies Committee of RSGB :
: 122.93W 47.67N Brinnon, WA USA CN87 - QRP and CW/SSB/DIGI :
: 10x56526 : FISTS 7055, FISTS NW 57 : Lighthouse Scty #144 :
: NAm QRP CW Club 1774 : QRP Amateur Radio Club Int'l 12781 :
: Contributing editor on Wikipedia - Amateur Radio/Space WX :
: The journey of life http://ic-discipleship-ministries.org :
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