74. OK VHF Field day 2022 by OK2A
The old wisdom says that it is not important whether the experiences were great, but that they were powerful. So it was with us this year and I almost paid the ultimate price for one such experience. But I'll start in order. This year's Field Day for me started back in December. We brought both non-functioning 70cm PAs to our hamshack. The dual, transistor one had a total of 8 of all 20 UHF TV transistors (150W CW one each) "blown". The reason was the heat... the gentlemen were turning the knobs to the right during the UHF Contest in an attempt to get the best result, ignoring the various beeps, squeaks and flickers of the protectors until it was fatal to the PA. We finished the contest that day with the PA limping on both legs at about 300W and something had to be done about the situation. Mechanical work began on upgrading the cooling of the individual semiconductor modules, but the work dragged on longer than I expected, so I finally decided to reach into my half-empty chest (we are building a family home in parallel) and bought two 70cm Italian kilowatt modules. This involved further mechanical and electrical modifications - including changing the power supply from 28 to 50V - and especially the need to sacrifice a lot of time for club results. The May sub-regional successfully survived this fundamental PA upgrade - perhaps the placement of the power module thermometers on the front panel had a positive effect. After all, just look at the report from that contest. The second nut was a burnt out relatively ancient (year of manufacture 1989) tube PA (originally with GI14b, later with GS31). That tube went to vacuum heaven during the UHF Contest, but unfortunately it took with it a 6-fold HV power supply and even a kW transformer that had a short between two windings. So the first task was to rewind the already considerably "bearded" transformer in JK Eltra company in Heřmanov Městec. I recommend this company! However, since Russian tubes are hard to find in the current situation, PA got an older GS1b. However, it had to be given longer training to stop it creating discharges and the PA got a newly made copy of the HV power supply and a 6A bakelite circuit breaker returned to the box instead of the 10A that was probably responsible for the burnt out transformer. The PA repair was completed 2 days before the contest. To make matters worse, I had to have the 20 year old Pashacek repaired - even directly at an authorized service center, because the ordered replacement of the cracked washer fluid container, in which water froze in the winter, required extensive disassembly of the car... So the actual price of the car has gone up measurably, hi. Now it's just a matter of arranging a MOT on the caravan - the first time I tried, an alert technician found a crack in the frame - so servicing, autogen, etc... It worked the second time :-) And so on Thursday 30.6 we set off for the Ore Mountains with an overloaded car, parabola and caravan. This was the beginning of my strong experiences... We met on the hill at midnight this time in a somewhat thinned line-up, which was supplemented only by Jarda OK1JFB. On Thursday we managed to assemble at least partially several 70cm antennas. However, the beautiful summer weather on Thursday was replaced on Friday by practically all-day, pretty nasty rain and cold weather, so the building duo OK1DIX and OK1TEH got solidly wet and frosty on top of the mast. The construction in the rain - setting up and wiring the stacks on the ground went quite slowly, so it wasn't until after noon that we pulled up the first one - the northern one. Next is 38 el. M2 and the southern 8x8 stack. But the rope got caught in the gate where it shouldn't have, the rope couldn't be loosened and this led to the destruction of the boom mechanics with the rotator. Don't wish to hear what the "crane man" had to hear, hi. The south stack and boom had to be lowered again. Fortunately, with about half an hour of axe work on the concrete foundation of the mast, everything was shaped back to a usable state and after a lunch break, everything was pulled up and successfully installed. In the meantime, other participants of the "tour" arrived, namely OK1DAQ, OK1KN and for the second time in history we welcomed Robert F1OET from the well-known contest team F6KFH on the hill. We were trying to quickly build everything that the mast should be "adorned" with and suddenly a scream from above, a short whistle and a bang as about a kilo weight fell from a height of about 20m about a meter from me. I had just been born again! Ugh! The weight is normally used to keep the rope from tangling, but the eyelet by which it hangs has unscrewed... That was a really powerful experience! At about 7pm we finish the antenna installation and Matej continues with the technology installation. We are so tired that we leave the construction of the GHz antennas for Saturday.
Saturday morning is as good as
painted. Even though my whole person is sore after Friday's scratch, we go
to install the antennas for the earthworms, which we do at about noon. I
go to revive the 70cm HW, and while OK1TEH is setting up the gear in our
kafravan, I discover downstairs that I'm missing some cables in the 70cm
setup. For a while I discuss with my son and Lada how to connect it all,
finally we stick to the "wall" and leave PA HA1YA and the exciter to rest
this time. The goal is to "break in" the refurbished PA with GS1b. Then a
non-radio amateur visitor arrives and I discover that despite the double
fuses, due to an unexpected short in the RX cable to the LNA of the north
stack, the NPN switching transistor in the SSPA has "blown". OK1DIX is
blowing on my back, wanting to transmit. So I unplugged the north stack
and the M2 antenna and the contest was on. The visitor afterwards claimed
that my face looked very worried at that moment. On both 23 and 3cm,
everything seems to be working so far. I'm having a coffee and thinking
how to get out of this. You can't cut an NPN switching transistor for 5A
current in a TO220 case out of a heating log... Nice experience... I'm
looking for something similar in various non-competitive HW in the shack,
but no luck. So I ask for help from OK1UBO from OL7C, who fortunately is
very helpful, so I go with Robert (btw: since he is from Alsace, he speaks
German and English as well) to visit Blatenský vrch. Despite all the
efforts of OK1UBO, nothing suitable can be found, so he lends me at least
an external Meanwell 24V/5A power supply. Great! From this visit there are
also a few photos on Tomato that Robert took there. After returning to the
Burning Ground in the evening, using the borrowed parts, I manage to get
all PA and antenna systems working, only the north stack with shorted
cable has to use the LNA down in the hamshack. Let the contestants
describe the chase on the band during the contest, I just more or less
accidentally made two DL stations on 23cm.
As OK1DIX saw it: As usual we landed with XYL Majka, OK1DYX on the hill on Thursday afternoon and together with Jarda OK1JFB we prepared something for Friday's 70cm antenna construction. Also the traditional kegging from the family brewery Mlýn was not to be missed. The weather was nice and so there was also a fire and roasting of goodies. The weather forecast predicted a deterioration, but we could not imagine what awaited us at that moment.
At night OK1VPZ and OK1TEH arrived as usual. On
Friday morning OK1DAQ and OK1KN arrived and the assembly could start in
good weather. After a while we also welcomed Robert, F1OET, who came to
see us again after many years. We reminisced about our VHF contesting
expeditions to the French Vosges and toasted the reunion after a long time.
However, at about 11am the clouds came in carrying a mighty washout and a
considerable chill. It couldn't have come at a worse time as Matej and I
were just about to climb the mast. We waited for the worst to pass, but it
didn't help much. In the diminishing and again intensifying rain we were
experiencing purgatory on the mast. At one point, a torrential downpour
drove us off the mast. Then came the critical moment. The rope got tangled
in the electric gate and instead of the required clearance, the rope
started to wind in the opposite direction. Before the operator could stop
the wicket gate, the 8x8 south stack rotator bracket was deformed by the
taut rope. We can speak of luck that the rope and pulley held and did not
end up collapsing the entire stack. The bracket and the whole stack had to
come down, of course. It looked desperate. OK1VPZ took care of
straightening it with a hammer and an axe. Fortunately, with concentrated
effort and targeted calibrated blows, he managed to level the mount
practically to its original shape. However, the repair and the breaks due
to rain cost us a lot of time. In the diminishing rain we finally finished
building the 70cm antennas, but left the microwave construction for
Saturday, even given the hour. We retreated to the house and dried out.
The usual fire and roasting was out of the question. Matej at least built
the equipment on 70cm and we could test the systems by listening to the
beacons. Everything seemed fine, but it was just an appearance.
Meanwhile I got the contest going. The start was
loose, the DL stations were going well on the 12x6 stack, but the absence
of 2 antennas, especially the long M2 at the top of the mast was
noticeable. Fortunately the south stack worked and so later QSOs were
successful into I where the improved conditions were felt. IU4CHE (705
km), I4CIV (714 km) and I1RBO (683 km) were successful.
Conditions were also good to the east, with OM and HA
stations over 500km being made, so it was a bit of a dilemma in the
absence of a northern stack where to turn the southern stack. Meanwhile
Fred worked AirScout and chat and set up a sked with SM6BFE (923 km) which
remained our ODX. Remarkably, it was done on a low 4x8 stack. YU7Q (758
km) was also a delight. We alternated with Fred according to (not only
physiological) needs. Robert, F1OET is still listening and getting
familiar with the VUSC program. I note that Fred is already reading OK
station signs in Czech without any problems, only OM still gives him a bit
of trouble :-). G5LK/P (807 km) and other long stations from SE like 9A8D
(711 km). Pendling with
the southern stack will also bring IQ1KW (765 km). Stations like ON4KBE
and a few PAs also bring improved conditions. G0VHF/P (819 km) has an
awesome signal and the arranged OZ2ND is again doing a low small stack
that works well beyond expectations. By PD proportions there is a good
turnout on the DL this time, probably due to the improved weather. A
series of IK3XTT, IK4PMB and IO2V will impress, with IK3SSG and IK2RHE
following nicely behind. Then we do the traditional Ivan, YU1LA (853 km),
YU7A (736 km) and the new station YR5C (839 km).
Meanwhile, Fred and Robert are waking up, so I give
them some space for a while. Nice contacts are still being made by the
likes of IK2BZY and IK4WKU, but the problem with one half of the double PA
is starting to show up, overheating until it finally leaves us for good
after 8000Z. Again there is a delay before the rig can be made to work at
least in the 4 PA range. Even then there are nice contacts like IW4QRD
(696 km) or PD0FSB. After lunch I leave more space to our guests who
really enjoy the traffic (especially Robert). In addition to the long PA
and I stations, they make another Romanian station YP2DX (781 km). The
contest ends with a nice result of 431 QSOs and 143500 points. We
subsequently learn that OL3Z have 12 QSOs less in the end, which is
surprising given the problems we had. I attribute this mainly to the good
conditions, which were probably even better in the east as evidenced by
OM6A's excellent result of over 194000 points (CONGRATS). 73 and CU latest in the UHF Contest OK1DIX
As David OK1RK (SK) would write - Hello hello hello, hello from the commentator's stand... The course of the match was this time marked by reduced activity of the home team...
There were beautiful
plans, big promises of who all will definitely come to Polňák and...
then people started dropping out. First "little Jarda" OK1JJI and his
dudes, Tomas, then OK1FLY, OK1FPG, OK1JFR, OK1FEN, OK1.. , well, to cut a
long story short, this time we had 10 "people" drop out and the rest
stayed mostly retired except for my little thing, which was really
unpleasant, because the weekend before the contest when I came to mow the
grass at the house I had a back movement and so it was not sure if I would
even unload, unfold and load the stuff into the car.... Eventually
everything was managed and on Thursday we could start heading towards
Spáleniště. But not to stay only with the negatives, this time our friend
Robert, F1OET otherwise known from 23cm as operator F6KFH decided to visit
us and I was also very happy to see Jarek, OK1KN our 3cm guru who
recovered from a stupid illness and Jarda ex OK1JFB. But back to the
contest, we went out pretty much as planned and the only thing I forgot in
Prágal was a waterproof down jacket, but I put that behind me at that
moment - it is after all a sunny Polnyak, so what could happen? Despite
all the hissing about how our car was sitting on the stops again and how
our dick would burst again, we finally arrived without the slightest
problem around 11pm and could go straight to the barn at midnight.
Lada and I were not left with a dry thread and it was
clear that we would skip the otherwise easy evening microwave building and
after a close call with the weights we would go to the stove to dry our
clothes and apply lemon balm on our nerves... While the others were
dissecting the experience, I was putting 70cm into working order, so since
we have indicator LEDs on the LNA boxes on the mast, we could visibly
verify that all RX directions were working to our full satisfaction.
Unfortunately on Saturday the north stack stopped working and we
subsequently discovered that the problem was in the RX cable beyond repair
without removing the stack from the mast, so we applied an emergency LNA
down by the equipment. With the weather under the weather, we skipped the
traditional campfire and guitar this time and went straight to the barn. The conditions were quite strange, the only improvement I observed was with HA5KDQ who were on 23cm at 550km S9+40dB and OM3KII, OM3RRC and OM3KOM also had a stronger than average S9+ signal. OM6A, on the other hand, were strong but not significantly so. At the same time I tried OK1KUO and OM3RRC on 9cm with our QRPP rig and nothing. Also HA5KFZ and other HA stations only reported that they could hear us, but no QSO came of it. I also failed to make contact with Paul, YU7AJM... Holt not every contest is a blessing. I went to sleep this time around 00:00utc with 133 QSOs and got up at 04:00 in the morning. Morning traffic started with promising easy AS QSO on almost 700km with Zlatko 9A2SB, SM7ECM, HB9BAT, I4CIV, G3XDY 827km, F6DKW 784km (pity Maurice had broken 70), HA8V, OZ9PZ, IW4ARD, OZ6TY. I also tried a very early morning 1150km long QSO with LZ2T, but nothing came of it. I took the opportunity that Jarek hadn't arrived yet and also made some QSOs on 3cm. After returning to 23cm the number of QSOs was increasing including a nice QSO with OZ9GE to JO66 and I was slowly starting to believe that I would again manage to cross the magic 200 QSO mark, when about 4h before the end of the contest the protection whistle blew and the fairy tale was over, as it turned out the TX jumper to the big 2.3m dish broke again... So for over half an hour I switched horses and the contest went only 2 directions to smaller antennas with 6dB less gain. Strangely enough it went quite well and I managed to make some nice QSOs, like DK1CB to Hamburg on random, ON4CJQ/P, I4UJB and even G5LK/P 807km with a nice signal. Then to finish the contest I make Thomas OK2PWY (tnx) and last QSO with DG6SA from JO31 with serial number 188 QSO. It was a bit more glorious on points, managing 66,000 points, almost the same result as a year ago and a great 12QSOs to Italy. Now a few words about the higher bands. On 9cm there is still a state of QRPP due to the number of HW repairs from 70cm, however, some nice contacts were still made, such as DK1C/P 254km, OE5VRL 244km and on Sunday morning even OK1KUO 262km over the Klinovec hill's natural wall with the help of a suitably flying aircraft. TNX. The total result of 10 QSOs seems to me to be a pretty good result considering the QRPP and especially the handing out of points made many stations happy. On 3cm this time Jarek, OK1KN, was in charge, and he was very good to work with. Despite the absence of Rainscatter, it went well and we managed to make a number of nice QSOs, especially with the help of aircraft. HB9MDP has already been mentioned, and on Sunday there were some nice TR QSOs with IK3GHY 550km, HB9BAT/P 518km, PA4ZP 527km and even PI4GN 532km. Jarek also made OZ1ALS 545km, ON4CJQ/P 562km and just before the end via plane also HA1A 447km. Too bad that there were not more stations on the band, such as LX1DB or DF0MU, and OK2C refused to make QSOs with us again (in order to keep the svazarm "hamspirit"). The total result of 53 (we believe valid) QSOs and 13 990 points from our forested hill is still excellent.
Then it was just packing up in perfect weather. In
the process, it turned out that a short flexi jumper on 23cm had broken in
the connector and to make matters worse, just as we were looking at the
connector, a rope snapped on our "Rossignol" goat, resulting in our 2.4m
dish falling from about 2m onto the concrete. Fortunately it fell directly
onto the double rib that separates the two parts, which nevertheless bent
anyway, which we then tried to fix afterwards in our Lhota village on
Monday evening. OK2A in JO60JJ - Výsledky / Results:
*)
Note:
comparison with
last year
July contest
More pics from FD 2022 you can see here: https://ok1teh.rajce.idnes.cz/PD_2022_u_OK2KKW_OK2A |