Yet another fun experience in contesting. I’ve taken part to the multi operator station IQ5FI last weekend for the CQ WW SSB international contest.
I’ve been active since 00:00 till 03.30 Gmt of Saturday 28th along to I5UKS Paolo, and then again another night spent with IZ5GUL from 20.00 to 04.00 GMT of Sunday 29th.
I have operated during the nights, mostly on 40 and 80 meters even if propagation has not been so good, we have worked aprox. 140 QSOs.
Other hams taking part to this station were I5UKS, I5RFD, I5CRL, IW5EIJ , IZ5HMK,IZ5GUL, IZ5HQB ,IZ5BRW ,IK5GQK, our claimed score is 299.153, we know is not much, but restricted antenna conditions did not help us a lot, location of our club station is in the historic center of Florence, (aprox one mile from the dome), so we did not expect to be big-guns competitors at all; we had fun in any case, and we did a bit of activity for our club call-sign IQ5FI.
Along to the picture you can see above, (joked a bit with photoshop) I’ve also taken a couple of minutes of random movies.
You can have look at it on YouTube (joked a bit with Premiere)
Let’s have fun with ham radio.
G5RV verses Superloop 80
Many operators with small lots, a G5RV is what can fit for the 80 and 40 meter bands. The G5RV is 102 feet long and has a 34 foot
section of twinlead followed by coax into the shack, possibly with some sort of RF choke on the coax. The ends are typically supported by ropes up in
the trees. An 80 meter dipole would be about 134 feet long.
A tiny lot is limited in antenna potential and zoning laws prevent real towers.
RadioWorks “Superloop III” designed by Jim, W4FTU, and refined over the years, is a good alternative
An easy-to-build general purpose receive only small wire loop antenna
As much as I like my coax loops, I am also quite satisfied with small loops made with wire or tubing. They have the same or better performance as the coax loops, but might require that you invest in a balun to help maintain directivity and avoid common-mode noise ingress from the feedline. If you need to null local noise yet still be able to listen to most skywave signals, these loops really perform.
The antennas described below bridge the gap between operating as a constant-current small loop (0.10 wavelength or less circumference), and intermediate-sized loop a bit larger than 0.17 wavelengths long in circumference.
If you are interested in building loops made entirely from coax cable you may want to check out my earlier project pages on that subject. It has many operational notes and other items of interest that pertain to small plain wire loops as well as to coax types.
The voltage balun was essential to help me fight common-mode noise and maintain directivity. If you don’t use a balun and have good results, you may not have much noise to deal with in the first place, or the skewed directional pattern has a null that works for you – even if it isn’t textbook. See my balun notes below.
I initially chose 14 feet since my noise problem extends up into the 40 meter band; I didn’t want the antenna to be longer than 1/10th wavelength because you start to lose your nulls with larger wavelengths of wire. I just did a quick calculation: (1005 / 7.150 * 0.10)
Note that I have since opted to use 28 feet overall, because I wanted better sensitivity on 160 and 80 meters, and now at 40 meters the 28 feet of wire still gives me a slight null – adequate enough for me to null my local noise on 40. Unfortunately I don’t have the room for a full-sized loop, so I had to wind it with two turns. See the EZNEC® antenna modeling plots below.
Here are some quick construction tips to get you up and running quickly. I’m still studying the antenna and will improve the page as time goes on.
Design of my cards has finished and my new QSL card is going to be printed. I’ve been working on this card since last month, and I’ve asked some offers all around the world for printing prices. I’ve used my Apple PowerMac G4 with Adobe Photoshop and Adobe (Macromedia) Freehand to produce the final layout, that you can see here. Picture has been taken with a Canon G5 Digital Camera.
About the subject, I’ve had a large choice od themes, considering that my city host so many famous monuments and panoramas but I’ve decided to use the Ponte Vecchio, since is one of the most representative monuments in Florence, and because is not so used by local hams for their QSL cards.
As said before I’ve been asking prices to almost all world wide famous ham radio qsl printers, and finally I’ve decided for IT9EJW service, mainly for clear information contained on his web site and for his competitive prices.
A complete list of links to QSL Printers has driven me for the choice of printing service.
On 2nd October 2006, Stefano Galastri IK5IIR, passed away.
He can be considered the european father of EH Antennas, since along to Ted Hart W5QJR was the main promoter and inventor of EH Antennas.
I’ve know personally Stefano since he was member of the local radio club here in Firenze. I’ve attended to some of his lessons on homebrewing EH antennas few years ago. Hams here say he was a gentleman and a very expert ham radio operator, he will be missed among the ham radio community. 73’s Stefano.
This document was originally posted by K4WW on rttyinfo.net but this domain has expired since some months at time writing. I’ve archived a copy that I believe could be usefull for beginners.
This is not intended to be an “etched in stone” indication of how to operate a RTTY contest, so please don’t take it that way! Whatever works the best for you, is what you should do, as long as it allows your participation to be fun! These hints were obtained from RTTY contesters, world wide, and only reflect how they try to make their operation more efficient! The more efficient “we” make our contest exchanges, the more efficient we make it for all involved! Band conditions certainly play an important part in the exchanged data, so establishing a “different” buffer could make your exchange more efficient in “not so good” band conditions!
A Simple Telegraph Key
by Arthur R. Nilson, McGraw-Hill, New York, 1942
A professional looking radio key can be made by the beginner or experimenter at a cost of a few cents for parts. This key is very satisfactory in every respect, as will be seen from Fig. 15. It is made of a short piece of 1-inch-square brass rod and a few other parts easily procurable. Its construction is clearly shown in the mechanical drawings, Fig. 16. As exact dimensions are shown in the drawings, no difficulty should be experienced in making this key.
During this weekend I’ve taken part to the Multi Operator station IQ5FI in the CQ WW RTTY.
IQ5FI is the callsign of the local ARI radio club in Firenze.
I’ve taken part to operations during the Saturday afternoon and mainly later from 20.30 GMT till 01.30 GMT of Sunday 24, and again in the afternoon of the Sunday. Picture has been taken at 01.00 GMT (3 AM local) along to IZ5GUL Luca.
Several other ham radio operators have taken part to the event.IK5GQK IW5EIJ IZ5HQB IZ5GUL IZ5HMK IZ5IMA. Has been funny to work during night hours, on 40 meters band. We operated using the club vertical antenna for 20-15 meters and the dipole for the 40-80 meters. The club station is located in the historic center of Florence, here you can have a look at the Google Map, and you will understand why big aerials are not so easy to setup here. !
[tags]ham radio,rtty,contest,cq,ham-radio,amateur radio[/tags]
Here you are a recent picture of one of my laster Buddipole experiences ! Well, I’ve played with this antenna one month, and overall impressions, is really positive. I’ve been able to compare this antenna to my old 3 bands dipole antenna.
First of all, one of the main reason I’ve bought this antenna is the “portability”, even if I’ve choosen the deluxe edition that includes the tripod.
Since my current antenna restrictions does not permit me to have a real antenna on the roof, the portable operations are my current only way to be active on ham radio bands.. (except few sporadic digital activities from home, using this antenna on the balcony).
Well, about gain, you cannot ask much to a portable antenna, what I can tell you is that signal reports received compared to the dipole, 7 meters above the ground, were really comparable in 15-17-20 meters.
Tuning this antenna is very easy in all bands till 20 meters, for lower bands, gain and tuning is really problematic. In 40 meters in example, I’ve never been able to go lower than 3:1 swr. I know that on lower bands is recommended very free space, and some particular procedurres, but really have not had much time to investigate yet on this.
I’ve noticed also that SWR change with the rotation of the dipole, and with the height of the mast. It often increase.
Manufacture of the antenna is good, also accessories, are well done. I’ve just experienced a problem with a pole connector, since the very first day, I will keep in touch with Bud to have some info. The Bag is usefull to carry on everything including the tripod, thta is the biggest thing inside. All the antenna bag, once full, is not heavy at all.
As backup antenna and for excercise I will try to build a home made buddipole antenna, with pvc tubes, maybe a dedicated version for 30 meters band, for my PSK31 nights from the apartment. More info to come.
Somebuddipole antenna related links can be found here, including a modified version that use wires instead of whips.
[tags] hamradio, antenna, ham radio, dx, amateur radio[/tags]
Was just having fun watching YouTube , and discovered some ham radio related videos like this one. EA3AJW operate ED3SSB contest station during WPX contest 2006.
Broadband and digital camcoders make this possible today ! [tags]hamradio,ham radio,contest,video,dxing,amateur radio[/tags]