Teme: Radio-amaterizam | Radio-tehnika

Build grid dip meter adapter coil for antenna analyzer

Antenna analyzer like MFJ-259, MFJ-225, MiniVNA and similar may be used as simple grid dip meter for measuring coils, traps and capacitors. All you need is grid dip meter adapter coil which you may buy (costs for MFJ adapter set is about 30 USD) or make it by yourself for few USD.

If you want to build on your own here are dimensions of original coils sold by MFJ.

Small coil for short wave frequencies: coil diameter 15mm, coil length 15mm, 30 turns of 0.5 mm copper wire wound on PVC tube. Coil inductance should be about 3.6μH.

Large coil for HF frequencies: coil diameter 50mm, 2 turns of 2 mm copper wire, free standing. […]
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Teme: Radio-amaterizam

CW Communicator

Istražujući programe za učenje Morzeove telegrafije za potrebe obuke u našem radio klubu YU1ABH, naišao sam na jedan prilično interesantan program – CW Communicator (CWCOM). Autor programa je Džon VK1EME. Ovaj program omogućava da koristeći telegrafski kod komunicirate sa drugim operatorima preko interneta. Naravno, svrha programa je učenje jer veze održane preko Interneta se ne smatraju pravim vezama. Smatram da ovaj program može biti izuzetno koristan prilikom obuke mladih telegrafista jer im omogućava da uz pomoć računara i Interneta mogu da vežbaju telegrafiju i održavanje veza na način koji je vrlo blizak radu na radio-stanici.

CW Communicator

CW Communicator

Vezu sa drugim operatorima možete ostvariti tako što ćete direktno povezati programe koristeći IP adrese računara. […]
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Teme: Društvo | Nauka

Čitate li Bibliju?

Mauro Bilino (Mauro Biglino) je prevodilac, po narudžbini Rimske katoličke crkve je preveo 23 knjige. Baveći se tim poslom, zaključio je da je Biblija, kada se čita neopterećena religijom i teološkim tumačenjima, nešto sasvim drugo od onoga što Crkva predstavlja. Ti zaključci su za mnoge neprihvatljivi ali svakako ih treba čuti.

Ovde možete pogledati jedno od njegovih predavanja na kojima objašnjava šta u Bibliji piše i poredi to sa teološkim prevodima i tumačenjima. Budite spremni da saslušate otvorenog uma, jer kako i sam izlagač kaže, on ne nastoji nikoga da ubedi, već samo, kao prevodilac, objašnjava šta bukvalno piše u ovoj knjizi. […]
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Teme: PHP

Kreiranje PDF dokumenta u PHP sa tfpdf, fpdf i fpdi

Potrebno vam je da na sajtu generišete PDF dokument koji je predefinisani obrazac a posetilac sajta samo treba da ga popuni? Evo kako sam ja to uradio. Verovatno će i vama biti korisno.

Postupak se svodi na otvaranje PDF dokumenta, učitavanje strane iz njega koja sadrži već pripremljen obrazac i zatim upisivanje dodatnog sadržaja u tu stranu, na mestima koja su predviđena za popunjavanje.

Za kreiranje PDF dokumenata može se upotrebiti odlična biblioteka FPDF. Biblioteka sadrži PHP klasu koja programeru omogućava kreiranje PDF dokumenata na visokom nivou, odnosno, da se ne mora baviti strukturom i formatom PDF dokumenta, već sve obavlja pozivanjem medota ove klase – smešta sadržaje na stranu dokumenta tamo gde želi i kako želi. […]
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Teme: Besplatni programi | Radio-amaterizam

Better Syncing Windows With Atomic Time Server

You may have need to have accurate time on your Windows PC. Windows already does have support for network time server synchronization and with recent versions ti should be set and turned on by default meaning if PC has access to Internet it will synchronize its internal clock with some of the world atomic clocks.

However, it might be good enough as synchronization is set to rather infrequent time periods, one day or even whole week. For some purposes it is needed to have clock synchronized more frequently. I need it for working Amateur Radio digital modes.

There are number of third party applications that can be installed on Windows PC as SysTray applications or services and allow more precise time synchronization. […]
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Teme: Događaji | Radio-amaterizam

Radio Amateurs in War

Symbol of defense of Yugoslav people became global symbol of resistance to NATO and USA terror all over the World.

March 24th. Year 1999. The very end of the 20th Century. With the nightfall strange sounds were heard in the sky and at 19:45 – explosions. Bomb fell on Yugoslavia, small sovereign country in Central Europe.

One word is on everyone mind – WAR!

Yugoslavia was attacked by NATO military alliance led by United States of America, the country Yugoslav people always considered as one of the best friends. At first, people were fighting mixed feelings caused by unjustly accusations, vicious attacks and betrayal of considered friendly and ally countries and disbelieve that what happens is at all possible as that was act against international law. […]
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Teme: Beleške

Svetla grada

Svetla grada

I ove noći na Starom gradu
sedim opet sam,
svetla grada, novog grada
posmatram.

I sve je isto kao nekad
sad se podsećam
svetla grada, istog grada
al ne bih sam.

Svetla grada prešla su
svetlosne mnoge godine
a ove moje,
još uvek stoje
na zidu iste gradine.

U koji grad je otišla
gde li je sad?
Svetla grada, našeg grada
seti li se kad? […]
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Teme: Samogradnja

ESP8266 Temperature and Humidity Web Service

After I successfuly tested HTTP server using Arduino and Ethernet Shield, I decided to try to accomplish the same thing using wireless connectivity. I decided to use ESP8266 on NodeMCU board. That is microcontroler with wireless interface all in one package, and quite low priced which makes it interesting for various purposes. I used the same temperature and humidity sensor DHT-22.

ESP8266 is supported within Arduino IDE which is big plus, as one can use the same development environment.

Soon I realized that popularity of this platform is well earned. It was very easy to set it up. Most of the trouble is setting up Arduino IDE to compile and upload to board. […]
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