Monthly Archives: January 2013

PowerMeter electronics

Posted by sm2wmv on January 24, 2013 Comments Off

I milled some circuit boards at work and smuggled in a few of my own designs as well. A few boards which are ULN2003A driver cards, a couple of ethernet module boards for the openASC box. I also designed a few peak-hold circuits which I plan to test with the PowerMeters. I have a problem that the new 16-bit A/D converter is too slow so the time between the FWD and REF sample is too long and the SWR calculation does not get accurate. And since the sampling time is too slow I can not do any proper filter either except a very slow one. So I am going to try using an LF398 chip so that I can hold both channels for enough time, that I can get a couple of samples and do the calculations. I guess we will see tomorrow if it works or not 🙂

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Aurora recording

Posted by sm2wmv on January 16, 2013 Comments Off

Hello lads, not much going on except some programming right now. But I had a recording that I haven’t shared with you that SM3JLA made of me during the CQWW CW contest on 20m, which shows what facinating things the aurora can do. I think this is a lot more common on VHF than on HF and this is the first time I’ve ever heard it.

Shack makeover cont…

Posted by sm2wmv on January 1, 2013 1 comment

Not much more work was done in the shack except some finishing touches on the remote. I fixed so that the RX switch for the TS480 works and should make it impossible to transmit on the RX antennas and it seem to work well. The plan was also to get the 60m tower rotatable but weather did not allow it with rain mixed with snow during a couple of days.

Lots of work to be done and I will try hard not to go too fast and make a mess of all wires again.