using hf propagation predictions

How to use Propagation Predictions

** Handy Notes for HamSphere 4 Operators ** – Propagation

Following the propagation is possibly the most important thing to learn when using HamSphere 4 or ‘Real world’ HF radio equipment as It will enable you to know which bands will give the the best chance of hearing contacts in any particular part of the world, and of course this will give any stations in that area the best chance of hearing You calling!

Question:- How do I know which is the best band for me to use ?

Answer:- Being on the Best band to make a contact depends on four main factors…Your location, where in the world you want to make contact, Propagation and Time..

The best way to be on the right bands at the right times is to look at propagation predictions from Your location. This will allow you to see which bands are open from your QTH into different parts of the world as the day (or night) goes by. — The example image below shows propagation for today from My QTH in Scotland (IO75sj) into Latvia. (Using VOACAP online ”http://www.voacap.com/prediction.html”)

Example Image: Propagation into Latvia from Scotland

Example Image: Propagation into Latvia from Scotland

– If I wanted to make contact with stations in Latvia at 18:00 UTC  I would be best to try calling for them on 40m, 60m, or 80m bands and would have a reasonable chance of contact on 30m band. — But If I wanted to make contact into Latvia and I was only going to be on the air from say 10:00 UTC until 12:00 UTC I would be best to try calling for stations in Latvia on 15m, 17m, 20m or 30m bands. — And if I was to going to be on air from 22:00 UTC until 00:00 UTC calling on 15m, 17m, or 20m would be pointless as there is no propagation from My QTH into Latvia on those bands and 30m would be possible but not as strong at 60m and 80m bands, So I would be best to use 60m or 80m bands to make contact into Latvia at that time. -

73 de Hairy Paul 108HS5625