0
\$\begingroup\$

I am new in telecomunications and this question just came up today and I coudn't find an explanation.

Here is the most common model for the ionosphere:

enter image description here

The ionosphere layer E is the main resposible for the reflection of the VHF signal which will allow communication over long distances during the day. But, during night, we don't have E layer because of the absence of the sun.

So, how does it happens during night? Does F2 layer became the main responsible for the reflection of the VHF signals?

\$\endgroup\$
  • \$\begingroup\$ It's typically for HF we talk about ionospheric refractions, not VHF. (Though that is also possible) \$\endgroup\$ – MrGerber Jan 20 '18 at 23:35
1
\$\begingroup\$

Basically, at night, you simply don't get long-range propagation of VHF signals at all, unless you bounce them off of something else, such as a satellite or the moon — or even ionized meteor trails.

I would recommend directing any followup questions to Amateur Radio.SE. Those people have more direct experience in this area.

| improve this answer | |
\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.