We have continued to gain experience with our recently completed mobile HF installation in our F-150 pickup truck. We have been working quite a bit of DX from our completed mobile station. Recently, I have been concentrating on the 80m band from the mobile station and have been pleasantly surprised with some great DX contacts on this band. The last two evenings around sunset here in New Hampshire, USA have been particularly good ones for 80m DX. This evening, I heard Aki-San, JA4FHE during a short errand just as we were one the grey line. I pulled over to the side of the road so that I could concentrate on the contact and turned on the amplifier (450W). After a few tries, Aki-San came back to me and we completed the contact! This was my first contact to Japan ever on the 80m band and it was from the mobile!
Aki-San has a capable antenna system including a 2-element yagi for the 80m band and his antenna system no doubt helped to make the contact possible. My received signal report was a 44 (he was 57 on my end) but the band was quiet and we were easily able to exchange names, signal reports and our callsigns.
I have also been working quite a bit of DX on the 80m band from our mobile station into Europe. I recently encountered a nice group of fellows working a team effort on 80m. I was on the light side of the afternoon grey line here in New Hampshire, USA when I worked Henry, OU5U in Denmark from the mobile. It was a bit early for 80m but our signal reports at that time were 55 both ways (I worked Henry again from the mobile later in the evening on 80m and our reports were 59 both ways the second time). I also worked John, G4PKP in the United Kingdom, and Ian, GM4UYN in Scotland during this session. Signal reports ranged from 57 to 59+ both ways.
John, G4PKP was using an 80m ground plane antenna and he was putting a good signal into my mobile once we were on the dark side of the grey line.
I am quite surprised at what is possible on 80m using a short antenna. Our screwdriver antenna (a Scorpion SA-680) is set up with a 4 ft rod and a cap hat. The 4 ft rod/cap hat combination is electrically longer than the usual 6 ft whip that one might use on a screwdriver antenna and therefore requires less of the screwdriver antenna’s base loading coil to be used to tune the antenna to resonance. This significantly improves the overall efficiency of the combination.
We are moving into the best part of the year for operating on the low bands here in the Northeastern, USA. The days are short and the 80m and 160m bands are quiet at night. I plan to concentrate on 160m next and see what sort of results we can achieve using our mobile station on the Top Band.
– Fred (AB1OC)