Novice From United Kingdom, joined Aug 2012, 90 posts, RR: 0 Posted (2 years 2 months 4 weeks 1 day 4 hours ago) and read 3400 times:
"The following factors affect the range of HF communication:
1. Transmitter power
3. Time of the day
6. Disturbance of the ionosphere"
Why is it the lower the frequency the further they travel, is are am i right here?
'Location'? would that be to do with the ionospheres lengths being different i.e. getting smaller towards the poles?
As with 'disturbance of the ionosphere' i take it the following wiki abstract is what they it is referring to;
"A sudden ionospheric disturbance (SID) is an abnormally high ionization/plasma density in the D region of the ionosphere caused by a solar flare. The SID results in a sudden increase in radio-wave absorption that is most severe in the upper medium frequency (MF) and lower high frequency (HF) ranges, and as a result often interrupts or interferes with telecommunications systems."
From that i don't understand why an increase causes it to absorb the radio wave? as i thought it was this increase in the ions that created the D region, which enabled radio waves or sky waves to reflect from
apodino From United States of America, joined Apr 2005, 4331 posts, RR: 6
Reply 4, posted (2 years 2 months 3 weeks 4 days 11 hours ago) and read 3095 times:
As an Amateur Radio Operator, I have had to learn a lot about this because we do a lot of stuff on HF in the hobby. I could be here all day writing, but I encourage you to check out ARRL.ORG, which is one of the national associations that deals with Amateur Radio. There are a lot of good resources there that should help answer your questions.