Изборник Затворити

Spiderpole 12m anchoring construction

Скраћена веза: https://pedja.supurovic.net/veza/8741

Spiderpole 12m made by Spiderbeam is very useful for portable ham radio activities. To do the job it must be properly anchored. This pole may be anchored at the bottom (at about height of the first element) which allows it to withstand wind speed of abut 80 km/h, and at 7 meters high using guying lines (as recommended by manufacturer) which allows surviving windows of 120 km/h.

Anchoring at the bottom seems not suitable for portable, as it requires either to have already set strong short pole (fence or something) to attach pole, or dig one into the ground. […]
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Dunax GPN-4B antenna construction details

Скраћена веза: https://pedja.supurovic.net/veza/8733

After few years of sitting on top of my apartment building I decided to bring my Dunax GPN-4B antenna down for repair as top capacitive hat was broken. I found out that there actually no technical details about fixing it. So I went through some work of gathering such information.

First I found out that manufacturer is out of business. Antenna is not in production any more and manufacturer site is down. I asked help from fellow hams, some sent me some info they had, some sent me contact info for manufacturer.I also used my own antenna to take measurements, so finally I got quite complete details that I believe could help other fellow hams trying to repair their own antennas but also ones that want to build similar antenna. […]
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Build grid dip meter adapter coil for antenna analyzer

Скраћена веза: https://pedja.supurovic.net/veza/8706

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. […]
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CW Communicator

Скраћена веза: https://pedja.supurovic.net/veza/8690

Истражујући програме за учење Морзеове телеграфије за потребе обуке у нашем радио клубу YU1ABH , наишао сам на један прилично интересантан програм – CW Communicator (CWCOM). Аутор програма је Џон VK1EME. Овај програм омогућава да користећи телеграфски код комуницирате са другим операторима преко интернета. Наравно, сврха програма је учење јер везе одржане преко Интернета се не сматрају правим везама. Сматрам да овај програм може бити изузетно користан приликом обуке младих телеграфиста јер им омогућава да уз помоћ рачунара и Интернета могу да вежбају телеграфију и одржавање веза на начин који је врло близак раду на радио-станици.

Везу са другим операторима можете остварити тако што ћете директно повезати програме користећи ИП адресе рачунара. […]
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Better Syncing Windows With Atomic Time Server

Скраћена веза: https://pedja.supurovic.net/veza/8659

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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Radio Amateurs in War

Скраћена веза: https://pedja.supurovic.net/veza/8628

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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