The preparations started in April when the 4L20m monobander has been dismantled in order to create space for the second KT36XA. I bought it used from HA0NAR Laci, purchased an upgrade kit from M2 and spent approximately the entire summer to clean/refurbish the old parts and make the upgrade.
Being confident of experience gathered during the previous antenna assembly; I simply moved the semifinished parts to the distant QTH without performance trial.. This decision costed eight full days (and nights) on the hill in wind and rain in a period of three months. Planned to participate in the SSB part, but the antenna was not ready by that time.
This part is for people planning to upgrade their KT34XA to a KT36XA:
The old KT34XA has several dimensional differencies compared to the M2..36XA. Before transporting to the hill the individual elements were sub-assembled in the garage and carefully marked. During the onsite installation though, the resonance frequency were off by 4-500kHz on 15/20m, but was almost perfect on the entire 10m. I would not detail each different adjustment step made during the three months; including the complete disassembly and rebuilding the antenna to its original specified dimensions; I was even comparing its physical lengths to the earlier installed antenna which works flawlessly from day one. (they were identical within 1-2mm in length, but still..) As consistent modifications of the individual elements did not lead to an acceptable compromise among all three bands; finally all have been reset back to drawing callout. At the end rootcause been identified was the length of phasing lines between the two driven elements. Infact, the assembly is straight forward in case all components are newly supplied by M2. However, when vintage KT34XA components are to be used; some of them are different in length, diameter and needs to be resized (cut) as per the new specs. (Even if M2 says it does not have any effect.. it really does have.) Neither the old nor the new phasing lines tuned the antenna to the published curves, but their implication made me suspect that is where I need to investigate. Without changing the distance between the two driven elements I started experimenting with extended length flexible phasing lines (insulated stranded wire). After a few hours of wire-chopping I was able to find the optimal resonance for all three bands.
Besides the "antenna bug" there were a few more Murphy's this year. But, at least I did not tear my biceps off this time. The night before the CW round the main amplifier has blown fuses twice and made me think I should use the spare for the contest after cca. four hours of repair and trials. A complete board needed to replace later.
Earlier the year I have taken lessons online to learn ten-finger typing. On a Hungarian keyboard the position of the Z and Y are reverse to the English one, so I needed to replace my "old ham keyboard" to a new where the letters are at the "right" position.. The old one had PS2 plug the new has USB... and it does not like RFI... One hour before the contest a few turns of keyboard cable thru a snap-on ferrite did not seem strong enough to stop a repeated CQ... Once I started to transmit the keyboard lost its connection with the PC.. Fortunately, this happened only on 20m where I was mentally set for a year to participate. The gear was sharpen for single band assisted high power category with inband so2r; all pieces tested in advance, but the keyboard..
I gave the thing one last chance 30 minutes before the start; checked the setup for 15m, found no RFI there, downloaded quickly a propagation prediction and drafted the first 24 hour operating strategy. I should say I was lucky with this option since I gained a few extra hours before the band opening. Otherwise I could have started immediately a 48 hour session on 20m with zero sleep. These last couple of hours though, made me think a few times it had been better to pack and go home.
At 00UTC I went to bed finally having in mind "I owe somebody with this" feeling and had a very good sleep.. while others started the contest.
15m had decent conditions during the entire weekend; except the Sunday closing that came earlier than expected. The recently installed satellite internet worked flawlessly throughout the contest providing enormous amount of RBN data for S&P enabling me to collect 154 countries and 39 zones. Multiplier hunting was much different with the inband SO2R than anytime before with the 2nd VFO. Shack ergonomics have also been improved since the last event, made me less exhausted by the end. The QSO count became 2,010 adding up to a total score of 872,030 claimed. It looks to be enough for a world 10. / Eu 5.
CU soon in ARRL DX CW.
The weekend of March 8-9th, 2014 became a casual participation in the SSB round of ARRL International DX Contest. Actually, the day before the contest I was not sure of the band I would choose. Still no full set of aerials were available for all-band categories. Propagation predictions anticipated excellent conditions for both 10 and 15m as well as the weather forecasts for the weekend in the Matra was promising.
The program has finally been optimized for hiking and some WAS-hunting on 10m. The weather was like in late March, perfect for a good walk on the hill, and by the time I got in front of the radio I was almost fallen asleep..
I did not spend much time for preparations prior to the contest, only a fast installation of the radio, PC for logging and the PA, no electronic voice keying as no soundcard in the PC, only my own "voice-memory" after a decent flu.
I needed to stop sometimes for discussions with goodwill neighbor hams that how terrible my audio sounds.. Finally, had some good runs, I mean relatively, as it was my first phone contest I have ever participated in my 27 years of ham radio. Managed 1.300 valid contacts and all 60 multipliers came back to my CQ. The 10m WAS target has been achieved. Heard plenty of QRP stations with no problem and received S9+20 reports several times. The setup was moderate this time; only one tribander fixed to NA, the old FT2000 and the PA set around 800W.
The band was extremely crowded and was very difficult to find an empty spot for CQing. Once found one; the rx filters needed to be set very narrow to hear a thing besides the close big signals.
I was far from the rates produced by the experienced stations in SSB contesting (HA8JV & HA3NU), but enjoyed operating a lot and understood how much important is practicing callsing reception thru contesting.
The station super location has accountably brought its benefits again (regardless of the weak operator); I was still able to hear W5/6 stations clear and loud several hours after sunset.
For me the CW part is the real thrill and will always be the priority to participate. It was fun trying something "new"; but the close two weeks difference between the two events will probably will make me focus on the first. I am planning to try in 2015 the SSB round in remote operation.
The first ARRL CW contest when I did not need to spend the entire weekend with antenna building a week before the event! So relaxing.. I used the time for preparations though. I checked the past 30 days SSN numbers to run propagation predicitons at K6TU's site. The software uses by default the predicted SSN figures which seemed to be a bit conservative this time based on the last 30 days historical data. I decided to run a prediction for SSN 130 to see a best case scenario. The reality ended up with even higher numbers than I expected, which did not change much on the outcome, but was helping me to define a worst case sleeping strategy.
Relative to the previous year's contests when the night openings were quite rare and limited to a few hours on one of the two nights only I expected higher activity this time. The predictions have supported the theory plus the high SFI numbers have already indicated that 15/10m bands will be open to attract people working there for the shorter daylight openings. Therefore the QSO rates during the local daytime openings on 20m were even slower than normal. But the nights.. sometimes S7-9 signals with very low noise levels and decent rates.
I made a post contest "prediction" to compare propagation conditions of mine with the two high scoring competitors in Europe (OH8L & 9A2NA). I set the same station configuration (antenna heights/number of elements/output power) for all three predictions to see purely the propagation diversities provided by the station location latitudes.
The prediction files contain 3 x 24 pages for every single hour during the day. I did not want to insert all of them in here; the daytime conditions are quite close among the three, so I picked the timeframe of 22-23UTC to show the real difference.. this is really unfair guys !!!(hi)
Again; in this simulation there is nothing to do with antenna gain and output power and tower heights, terrain (plains and hills).. it is purely propagation diversity of the same continent!
OH8L @ 22:00 UTC
9A2NA @ 22:00UTC
HA7GN @ 22:00UTC
A weekend after the contest I spent a few hours to run a "spot analysis" with the related support program of the Reverse Beacon Network. I found it an extremely useful tool for:
- Confirming the signal strength prediction accuracy of the K6TU program thru the actual spots of real CW skimmers.
- One can compare signal strenght of his station to other competitors
- Visual feedback on antenna stack performance per target area (applicable if subject skimmer detection is providing adequate readings with minimum standard deviation)
- Comparing the operating/sleeping strategy with other competitors (assuming the skimmer was able to detect all subject stations in the period of examination)..was it a good idea or not to switch off for a nap at 9:00UTC as such..
The post contest analysis included checking all the North American skimmers being active during the contest weekend. As I did not see the claimed scores of UA5C on the listing at 3830, but quite few spots reported with strong signals; I thought would be wise to involve him in the comparison besides OH8L and 9A2NA. Here below is a few of the lot can be viewed at the RBN site. All of them clearly (sadly) showing that at around 21:30 UTC my signals are declining remarkably relative to 9A2NA and OH8L; just like in the prediction. (The numbers besides the vertical axis represent the signal-to-noise ratio in dB) The program is Beta experimental version; they may fix it later that the legend can be moved out from the graph area.. I did not check how far the database is searchable back in the past, but I was able to run queries for the 2012 ARRL CW just now..
N6TV skimmer spots at Reverse Beacon Network - 15FE2014
VE6AO skimmer spots at Reverse Beacon Network - 15FE2014
N8MSA skimmer spots at Reverse Beacon Network - 15FE2014
I have run a comparison analysis to see the differences among Hungarian contest stations for benchmarking my signal levels relative to the big boys. HG5D, HG1S and HG7T were entering in all band competition, thus if no spot appears in the timeframe where mine are displayed it could mean they were on a different band. Without extensive analysis it looks that it is not that bad.. (my setup was: KT36XA + 4L longboom monobander + OM2500A)
N7TR skimmer spots at Reverse Beacon Network - 15FE2014
AC0C skimmer spots at Reverse Beacon Network - 15FE2014
VE6AO skimmer spots at Reverse Beacon Network - 15FE2014
NN3RP skimmer spots at Reverse Beacon Network - 15FE2014
All in all it was a great contest with rarely experienced good conditions. It gave me the best QSO count ever, even if it was not enough to beat the guys at the top spots. I congratulate to them and will try to catch up to their scores in the coming years. My claimed scores are 234,030 ( 1,345 QSO / 58 multipliers).
CU in the SSB part this weekend.
Gabor - HA7GN