WCW2014 – World Castles Weekend in Uzice, Serbia

Skraćena veza: http://pedja.supurovic.net/veza/7592

It was just several days before this year world Castle Weekend that I decided to participate by activating one of the fortresses in surroundings of my hometown Užice. Actually, I was targeted to activate YU-0030, Fortress of Solotnik, as it was never activated before and thus should be more interesting for WCA hunters.

wca-yu-00023-2014-06-14-01

As I still did not have all necessary equipment and tools I asked for a help of Milan YU1ZZ. As experienced contester he was up to the task, ready to improvise if necessary. One short phone call settled it down. Milan is primarily high class contester and DXer, but it seemed to me that he is actually seeking for something fresh and more relaxing, and he was really interested in my previous activation of Old fortress in Uzice (YU-00023). […]
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Ham Silouethes

Skraćena veza: http://pedja.supurovic.net/veza/7586

ham-silouethes-02-pedja.supurovic

Serbian ham radio portable expedition captured on Zlatibor, Karaula, VHF contesting in bad weather.


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W6CCP – The King of Impoliteness

Skraćena veza: http://pedja.supurovic.net/veza/7530

Today just past 17:00 UTC at 14214 kHz I witnessed behavior of  ham radio operator W6CCP that was as rude as it could get.

Saddiq A41KJ was on the frequency calling CQ, and had big pile-up from European stations. He was called all over but handling situation nicely and getting through the list of stations calling him.

Then, out from nowhere, W6CCP came out, obviously with very high power, screaming on top of all other callers for Saddiq to turn to long pass to North America. He was so powerful that he out-called all stations in pile-up. He gave fine report for A41KJ but insisted for him to turn to long pass. […]
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Remote Controlled Antenna Switch

Skraćena veza: http://pedja.supurovic.net/veza/7497
Antenna switch in a stack

Remote controller for antenna switch in a stack

As I live in apartment building I have apparent problem with setting up ham radio antenna. The obvious place to set up antenna was the roof as it  is easily accessible. Due to small space and me not wanting to make mess of a wires, I decided to use compromise vertical multiband. A friend had spare DunaX-GPN4B (40, 20, 15 and 10m) so it was obvious choice. I had to put down about 30m of coax cable to my apartment, and soon I was in the air.

Not for long I found out that I do miss 80 meter band a lot. […]
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Koliko snage emitujete?

Skraćena veza: http://pedja.supurovic.net/veza/7483

Nepresušna tema u radio-amaterskim razgovorima je snaga radio-stanica. Ma koliko da je imamo, to nikada nije dovoljno. Uvek su na ceni jače radio-stanice, a mnogi radio-amateri ne smatraju svoju opremu zaokruženom ako ne nabave neki pojačavač snage.

Interesantno je da je prvi korak u povećanju dometa obično povećanje snage predajnika. Nažalost to ume da ode i dotle da se izlazi iz okvira propisa i emituje snagama koje su daleko veće nego što je to dozvoljeno, a da rezultati ne budu baš odgovarajući.

Mnogi su se uverili da prosto povećanje snage ne da nije uvek nego često uopšte i nije rešenje. […]
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My First World Castle Award Activation (WCA YU-00023)

Skraćena veza: http://pedja.supurovic.net/veza/7468

I did my first World Castle Award activation. Although it is mid February, weather forecast was sunny and warm for today, so I planned to go outdoors. As I live very near WCA YU-00023 (Stari grad, Užice) I decided to pack up my gears and walk to the old fortress and make an activation. I was accompanied by a non-ham friend.

YT9TP WCA YU-00023 Activation

As I am preparing for portable operations, this was nice opportunity to check how my equipment behave.

Basically, it is YAESU FT-857 with portable three band linked dipole (80, 40 and 20m), one LiIon 14.4V 5Ah NL202HD battery and another sealed lead acid 12V 7Ah battery. […]
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Universal CAT and programming USB to RS232 TTL interface for ham radio

Skraćena veza: http://pedja.supurovic.net/veza/7437

As soon as I got first two ham radio rigs, I needed to connect them both to PC, to program memories or use CAT control from logging software. I realized that it is impractical to have as many USB to RS323 adapters as rigs.

As serial connection for radio requires just RX, TX and GND lines, and it is the same for most of modern radio stations. It is actually only radio connector that is different – signaling is the same.

It showed up quite easy to build simple multirig adapter. All you need to do is to use existing USB to serial interface adapter, cut it’s cable in two and insert male and female three pin 3.5 mm jack (commonly used as stereo audio connectors). […]
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Ocena signala u digitalnim vezama

Skraćena veza: http://pedja.supurovic.net/veza/7355

Primenom digitalnih modulacija u radioamaterskim komunikacijama pokazalo se da klasična RST ocena signala koja se primenjuje za telegrafiju nije pogodna.

Stoga je osmišljen nešto drugačiji sistem ocene signala koji se koristi za ove načine rada koji se označava kao RSQ. Ova ocena signala takođe sadrži tri informacije ali drugačijeg značenja.

R (Readability) – čitkost

Čitkost izražava procenat ispravno primljenog teksta. Ova ocena je nastala iz običaja operatora da pored klasične ocene signala daju i podatak o procentu primljenog teksta.

R5 95% – 100% Savršeno čitko
R4 80% – 95% Poneki ispušten znak
R3 40% – 80% Dosta ispuštenih znakova
R2 20% – 40% Tek poneka reč je čitljiva
R1 0% – 20% Neprepoznatljiv tekst

S (Strength) – jačina signala

Merenje jačine signala S metrom radio prijemnika je nepouzdano jer digitalni signali su veoma uskog spektra tako da prijemnik može istovremeno da čuje (mnogo) više stanica te S metar u stvari pokazuje neko srednje merenje svih tih primljenih signala. […]
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