If you are fortunate enough to have equipment to measure return loss of your antenna system here is a chart that will convert the return loss in dB to SWR…
The BigIR antenna from Fluid Motion looks like a winner, but there are some concerns about the 80 meter option.
During Field Day 2008 we carefully observed what operating modes the young teens did and did not enjoy while they operated. Without a doubt the digital modes, especially PSK31, got their attention.
The older of the two, KJ4FAJ, in the picture above said this when he made his first PSK31 contact just after midnight during Field Day…
If you are like many recently licensed Amateur Radio operators your first purchase may well be a good Icom, Kenwood, Yaesu or other brand Handy-Talkie or HT two way radio. These are most frequently for the 2 meter and 70 centi-meter bands (144 and 440 MHz).
The antenna that comes with your radio is probably about 8 inches long and is a compromise between convenient length and performance.
I guess it was only a matter of time before Java made its way into the world of ham radio. Really, Java has been at the forefront of computing for some time. Whenever a programmer friend asks me if they should port their popular program to Java I say “why bother, Java is just too slow.” That was then and this is now.
Java is still slower than directly compiled programs, but computers are so fantastically fast these days, this issue is becoming not an issue.
One of the participants on the Sunday Night Tech Net mentioned he is reviewing and modifying a new, too him anyway, JAVA based contest logger.
Enter JL Logger…
During our Field Day 2008, we experimented with many power options. Since it is a well known fact many UPS devices are not compatible with the power generated by certain generators, we will report the combinations that work.
Field Day 2008 was great for us. Our wide area wireless network worked pretty well and every station could monitor progress of the whole group.
This year we extensively used the “operator initials” field in the N3FJP Field Day Network 2.8 logging software package. Operators used their call-sign as their ‘initials’ while honored guests used their actual initials.
The site-wide log offered many great analysis possibilities. One particularly interesting metric we tracked this year was QSO rates. We generated graphs of QSO totals vs. Time Between QSOs. Here is an example of the entire log…
It is well known many models of UPS units do not like the power from motor power portable generators. Indeed it is a difficult task to keep the sine wave pristine when you don’t have the benefit of hundreds of square miles of the power network feeding you an almost infinite about of energy. Here is an example of the waveform from a truck mounted generator delivering much less power than its rated output… about 100 watts from a 5,000 watt generator.
The manual for the Honda EU2000 clearly states this, but you need to be sure you adjust that little circular knob on the Fuel Cap to the operating position or the generator will certainly quit after a few minutes operation.
Well not really attracts lightning, but certainly allows for more pickup of lightning energy.
Last night on our Sunday Night Tech Net (Fauquier County, VA Repeater) a fellow named Bob brought up the topic of proper grounding for his upcoming coax fed 40 meter antenna. During the discussion about common ground points and other relating lightning protection possibilities, he recalled a story.