Category Archives: Amateur radio

Amateur radio: California QSO Party, October 7th-8th, 2017

I’m getting close to finishing my first 12 months on the QSO party circuit, and the California QSO Party is one of the biggest of the year.  Being next-door, I figured I would be able to make a lot of low-band QSOs, but wasn’t sure about 20 meters and above.  The contest ran from 16UT on Saturday through 22UT on Sunday (9am Saturday to 3pm Sunday local time).

Unfortunately, I was not able to do anything radio-related until after 6pm on Saturday, then I had to spend 2 hours getting my new 8-foot diameter loop up and fully operational, including a trip to the hardware store.  I finally got on the air at 0330UT (8:30pm CA and AZ time).  The goal of my largest transmitting loop to date was not only to increase my radiated signal on 40 and 80 meters, but also to be able to transmit on 160 meters.  See my recent post for more information on the loop.

As Murphy’s Law would have it, the first station I heard calling CQ on 40 was having trouble hearing everybody, so after 5 minutes I still wasn’t sure if my antenna was working properly.  But, once I gave up on that station, I was able to make a bunch of easy contacts on the band.  Even with losing 15 minutes struggling to get the loop up a little higher (center of the loop at 10.5 feet), I managed 15 QSOs in the first hour on 40.

I switched to 80 meters, where their were even more good signals out of CA and I picked up 24 QSOs in an hour, a new record for me, including 15 in 25 minutes.  This is all “search and pounce” and especially on 80 meters, the bandwidth on a small transmitting loop is very narrow, so I have to adjust the tuning capacitor before just about every QSO.  This is accomplished using a miniVNA Pro as an antenna analyzer, so I switch the antenna input into that, which goes into my laptop.  The vacuum variable capacitor up on the antenna has a 12-volt motor connected to it, and that runs into the shack to my rig power supply and a simple control box.  The miniVNA Pro sends less than 1 milliwatt to the antenna to analyze it, so it doesn’t transmit a bunch of QRM like some “real” antenna tuners that you often hear on the HF bands.

After that, I switched back and forth between 80 and 40 a couple times.  Activity dramatically dropped off at midnight (07UT), not surprisingly.  I got my 56th QSO (including one duplicate) shortly after that, then nothing more.  I listened on 160 for a station that was periodically calling CQ, but he never heard me respond.

I was back at it on Sunday morning a little before 13UT, and made some more contacts on 40 and 80 meters.  Unfortunately, when I finally checked out 20 meters on my smaller loop, I could barely hear any CA stations, just a cacophony of stations from the eastern US calling into CA.  Unfortunately, indeed I was too close to CA to get any QSOs on 20, so I gave up at around 16UT.

I came back for the last 25 minutes of the contest, still not able to work anyone on 20, but picked up several more QSOs on 40.  I ended the contest with 72 QSOs (plus one duplicate), split evenly between 40 and 80.  I worked 37 out of 58 counties, which I felt was pretty good for just two low bands.  Of course, if I was further away, I might not have made as many 80-meter contacts in getting more 20-meter contacts, so it’s hard to say what that would have done to my county total.


Amateur radio: 160 meters…maybe

I’ve been thinking about ways to get on 160 meters with my very limited space for antennas.  I use small transmitting loops (“magnetic loops”) to cover from 80 meters to 10 meters.  These loops are tuned by the amount of inductance of the loop and a variable capacitor. The frequency scales as the reciprocal of the square root of the inductance/capacitance product.  Thus, the obvious options were to build a larger loop to get more inductance, and/or use more capacitance. Continue reading

Amateur radio: 15-meter opening, September 24th

It’s been a while since I posted because I keep getting into the mindset that I need to make all the posts highly detailed.  But, I’m going to try to post smaller things more often.

With such low solar fluxes this year, activity above 20 meters has been fairly limited.  While working the second day of the Texas QSO Party, I saw on the DX spotting sites that 15 meters was open across the Atlantic from the eastern US.  The better news was that the opening was actually extending out West.

Continue reading

Video blog episode 011

I finally finished off the 6-meter Yagi project and got it on the air. I’ve actually been using it for a while, but needed the ARRL VHF contest to get enough activity on the band to shoot video in a reasonable amount of time showing me making QSOs. I was running 50 watts into the 4-element Yagi and worked sporadic-E clouds to 30 different Maidenhead grids, including two in New Hampshire, which were my first double-hop sporadic-E QSOs. Enjoy!

Amateur radio: I’m a 2nd Placer!

The 7th Call Area QSO Party (“7QP”) took place on Saturday, May 6th.  The 7th call area contains Arizona, Idaho, Montana, Nevada, Oregon, Utah, Washington, and Wyoming.  Most of these states have sparse populations, so a combined event was begun in 2006 and has become one of the more popular annual QSO parties.  Although the FCC long ago dropped the requirement that your call had to match your call area, most operators do have a call that matches, so the name still fits (in my log it was about 80%).  Also, the Delaware, New England, and Indiana QSO Parties were on the air the same weekend, so there were a lot of cross-contact between the various contests. Continue reading

Amateur radio: ARRL DX contest

This post is rather belated, but I thought I would finally write about the ARRL International DX Phone Contest, the weekend of March 4th.  Basically, as a U.S. mainland station the goal was to contact as many people outside the U.S. mainland in as many countries as possible, and for non-mainland the goal was to contact as many people as possible in the lower 48 states. Continue reading