Category Archives: openASC

July update 2019

Most of July was spent re-routing cables from the house to the new shack. It was a lot of work but I managed to get it done. I also got help a week by SG3P (SK3W) which is always nice and also SM2UVU came up and helped while Gunnar was here.

We also managed to fix the 40m 4-SQ. The control cable was re-routed to the Moskojärvi tower to hookup on that 40-lead cable. One of the vertical posts had been pulled up out of the ground a bit by the frost, so that the cable had pulled out of the vertical. Easy fix.

We also managed to get one radio up and running inside the new shack.

Rotator work

Last weekend me and Anna + Hicco spent some time at the station. I mainly spent time getting the rotation of the Moskojärvi tower to work. Me and my neighbor also spent time planning out where to put the inband tower on his land. The plans turned out great so now we have a fun project for next year. Left to do getting the Mosko-tower rotating is putting the pot in place, running a bit more cables and configuring the rotator board for the openASC system. So hopefully its finished before CQWW DX CW in a few weeks.

New SO2R position

I’ve been upgrading the SO2R position at SJ2W with the addition of a Elecraft K3 and an MK2R+. I’ve been busy making cables with filters built into the D-SUB connectors for the MK2R+ since I think it lacks a bit filtering. I need to finish up the cables for the K3 and need to think abit of how to do it so I can change between remote and local operation without changing any cables. I’ve listened a bit on the radio and it seem to be OK, we will see after the first contest what I think of it.

Various stuff has happened lately

SM0W, SA0AZT and SM0SHG came up to spend the weekend at the lab at work building antenna switches and I finished up the openASC-boxes for SK0UX. It was a lot of fun and we got lots of stuff done. They still have quite a bit of work to do but they got with them the openASC boxes as well, so now there are three stations in Sweden using the openASC system, SK0UX, SJ2W and SK3W.

It also seems like I am claimed #1 Europe on 20m SSB in WPX SSB which is a lot of fun!

I also did some tests to test if the theoretic Q-value of the PI-filters we use in amplifiers correspond to measurements done with the VNA. It did not match at all, I got the values 4 times higher when having Q-value of 12 on the VNA compared to the theories. However I need to do more thinking and testing on this to figure out why. Maybe somebody can explain? I used the -3dB bandwidth to calculate the Q-value.

I also spent time cutting metal for the power supply for the amplifier project. I’ve collected some material at work which would have been thrown out and used it for the amp. I also bought some wheels that will be mounted to the amp which limits the weight of it to 400kg, but I should have quite some margin 🙂