Quick Login

Author Topic: Solar flux index etc  (Read 2020 times)

Offline M0ggk

  • Leading Rate
  • *
  • Posts: 8
  • Country: england
  • Easy with High power try QRP
Solar flux index etc
« on: December 15, 2013, 16:57:52 UTC »
Hi all
        Ok this may seem a daft question but I will ask it and please forgive me?

When you look at the band condx when would be best to operate ? What am I looking for?

Any gurus out there that can answer ?

Dave M0GGK
Best 73 Dave M0GGK

Offline IZ5ZCO

  • Admiral
  • *
  • Posts: 406
  • Country: it
  • The world is too small for QRO.
    • QRP Club
Re: Solar flux index etc
« Reply #1 on: December 18, 2013, 23:33:03 UTC »
I use VOACAP Online HFBC:
72 de Nicola

Offline GM0LVI

  • Admiral
  • *
  • Posts: 423
  • Country: scotland
Re: Solar flux index etc
« Reply #2 on: December 23, 2013, 21:34:25 UTC »
No such thing as a daft question Dave!
However the answer to yours is full of ifs and buts.
Propagation varies day to day as the SFI and A & K indices change, there are also seasonal variations and of course the sunspot cycle to take into account. For "Good propagation" you want a high SFI and low A&K.
And as you'll no doubt know time of day influences the maximum usable frequency.

If you download W6ELProp (just do a web search for it) it allows you to enter current SFI and K values and then will calculate signal levels for any chosen band between your QTH and any other and will show on screen or print out tables and/or graphs.
I've been using it for around 20 years and have found it to be a good guide when planning skeds and contest strategy.
Back in the early 1990s I was QSL manager for an Antarctic station and we used W6ELProp to plan our weekly skeds and it was pretty reliable.