Construction
I have RFI, now what– Part II, House Cleaning
I then brought up each circuit one at a time… Remember I had all the major appliances unplugged, so this test is looking for the various vampire devices that suck electricity all the time, pretty much anything with a wall wart on it. First I brought up the kitchen. That caused no issues, so I started turning on lights, and plugging things back in. The first source of RFI I found was a set of LED lights I got from Walmart. They are the ones that look like a 100W light, and put out about as much light as a 100 watt light. I heard nothing from them on 80, 40, 30, or 20. However on all bands above 20, they put out a horrific spray of RFI. Had I not checked all bands between testing I would have missed this. OK I noted this in my log book, and put a note there to change them out later. I turned them back off, and plugged in the refrigerator, I got a bit of RFI, so I added a few 31 mix ferrites to the power cord, and that RFI did not return. Next the Microwave got plugged back in, again, a small amount of RFI, and again a ferrite or two took care of this. There were no wall warts in the kitchen, so that pretty well took care of things for the kitchen. Continue reading
I have RFI, now what– Part III, Quantification
Over the past few years my RFI problem has been getting worse and worse. 40 Meters was unusable due to QRM last year, I am only now beginning to be able to use 40 meters again. Other hams in the area, (1/2 mile away), closer to the source of the RFI have lost the entire HF spectrum. See the movie above. Hit play, and all looks well until about 22:30 GMT, which is about 3:30 PM in my local time zone. As you can see, the RFI goes off scale at that time. The S Meter reading for that signal is around 10 db over S9. It is also affecting three other hams in the area. One poor fellow is so close to it that all ham bands are wiped out, 160 Meters through 10 meters are unusable during this time frame. There is another ham located about 1/4 mile from the source, he has just moved in, and was unaware why his use of 40 meters was precluded due to RFI. So there are folks who have it worse than me in this! Note this is an older recording, currently the start time for the RFI has changed to 01:36, or 7:36 PM local time. All in all there are 4 and possible 5 hams affected by what is a single source, over one or two square miles, all from a single source. We have the general area pinned down, and this summer, (2014), we are going to locate the house, and either contact the owner, or request FCC assistance. Continue reading
Review of West Mountain Radio’s RIGrunner
What this means is that the device has the Powerpole connectors pointing horizontally out of the side, as opposed to pointing up out of the device. I was going to mount my RIGrunner 4008H on the side of a vertical desk support, and I wanted the power cables pointing downwards, and not out towards the wall behind the desk, so the H model was the model of choice for me. As can be seen from the photo at the left, the H version did exactly what I needed. I wanted to move the desk as close to eh wall as possible. I also wanted a pigtail so I could add ferrite snap on cores for RFI suppression to each 12 VDC lead.. All of this just screamed downward pointing cables. Hence the choice of the H version, so I ordered it and it arrived a few days later. Continue reading
Rebuilding the Shack– from scratch
In 2014 I decided to upgrade the station, I became retired in 2013, and my use of the station was no longer weekends, and holidays. I could use it anytime I wanted, day or night. I decided I needed a better radio, and a bit more desk space. After a lot of looking, the Elecraft K3 popped up on my radar. The K3 provided me with a better radio, and a bit more desk space, exactly what I wanted. At the time of purchase for the K3, I decided it was about time to do a station rebuild, starting with the station grounding , and working my way to the Coax, and finally the control lines. Continue reading
Phased arrays for 40 and 30 Meters
As you can see, even though it would fit, the compromises would be too much for 40 Meters… The radials in the North/South direction would be compromised, to say nothing about being up againset a chain link fence on the south side, and an eight foot metal fence my neighbor to the North put up… So… Change of plans! Continue reading
