Uwolnić Radiofonię, czyli pomysły na wdrożenie małych społecznych rozgłośni

Prowadzenie własnej prywatnej rozgłośni radiowej może być ciekawym hobby które może się przekształcić w znacznie większy projekt. Możliwość emitowania własnej muzyki, kontakt ze słuchaczami oraz poznawanie techniki radiowej przyciągają młodych ludzi i tworzą lokalne społeczności skupione wokół radia. Małe lokalne rozgłośnie mogą również rozszerzyć działalność lokalnych fundacji lub stowarzyszeń skupionych wokół mieszkańców miejscowości czy osiedla.

Założenie rozgłośni radiowej emitującej swój program w zakresie UKF FM jest zadaniem zbyt ciężkim dla grupki zapaleńców, gdyż pojawia się tutaj proces starania o nową częstotliwość, konieczne jest wzięcie udziału w konkursie koncesyjnym który możemy jednak przegrać jeżeli pojawią się inni chętni na naszą częstotliwość, a działalność radia będzie mocno ograniczona wymogami określonymi w koncesji oraz w przepisach.

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Modification of the RF input filter in TEF6686 module

TEF6686 based radio tuners are very popular nowadays. There are two versions of the 10-pin modules.

  • Current version, which is available on Aliexpress (left)
  • Old design for TEA685X, which is pin compatible with TEF668X (right)

The main difference between them is a different RF input circuit. Both designs use balun FM antenna application, but only the old version implements good RF filtering.

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Fujitsu FUTRO S520 (Thin Client) – My experience

Not too long ago, I started looking at PCs that would serve as a web-server for the FM-DX Webserver. My local Czech market was not particularly filled with good options, especially since we don’t have huge marketplaces available locally. I scouted through marketplaces from other countries such as Aliexpress and eBay; however, I couldn’t find anything cheap shipped within Europe.

As a last resort, I decided to visit the Polish marketplace Allegro. Nevertheless, I was positively surprised. I checked the cheapest Mini PCs, and what caught my eye in particular was the Fujitsu S520 thin client at a very good price tag of 56 zł, which equals roughly to 13€. This offer, in particular, also included the original power supply and an extra mouse, which was a nice addition.

 

The S520 in its full glory.
The S520 came in looking almost brand new.
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Dell Optiplex 3000 Thin Client – Home Server

Recently Dell Optiplex 3000 Thin Client has become widely available on the second-hand market at affordable prices. As compared to the previous generation of low-power terminals (like my previous Dell Wyse 5070 Extended), it has an improved performance and decreased idle power consumption. It features a passively cooled Jasper Lake Pentium N6005 CPU (4 cores, up to 3.3 GHz) and supports DDR4 RAM. Built-in eMMC disk can be used for storage or an optional NVMe SSD installed in the M.2 2230 slot.

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WRMI ogłasza zbiórkę na GoFundme po huraganie Ian

WRMI (Radio Miami International) jest prywatną rozgłośnią radiową posiadającą sieć nadajników i systemów antenowych. Nadawca ten pracując na falach krótkich oferuje innym możliwość transmisji lub retransmisji programów radiowych. Na antenie WRMI można spotkać audycje muzyczne, o tematyce religijnej, radiowo-techniczne jak np. WaveScan, eksperymentalną audycję Radiogram czy chociażby retransmisję rozgłośni Radio Slovakia International.

WRMI logo

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My Commodore 128 repair journey

What could go wrong if you buy a broken retro machine for cheap just to repair it and make it shine again with VIC-IIe colors and sing with glorius 3 channel SID chip? It’s not as easy task as I thought earlier and this repair went for much longer and costed me way more as compared to my previous Commodore 64c repair. Despite all the time, money and effort I put into it I don’t regret it at all. This repair allowed me to learn A LOT about electronics and electronic repair.

Commodore 128 in it's gloryMy mighty fixed Commodore 128 in it’s full glory.

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Fixing Airspy HF+ Discovery VHF interferences issue

A few years ago I bought the original dual port Airspy HF+ and was amazed by it’s reception quality. I’m using this sdr receiver up to this day for both HF and FM DX-ing and couldn’t find any other affordable yet so good receiver. Back in 2021 I bought Airspy HF+ Discovery as a replacement in case my dual port receiver is struck by ESD during lightning storm or something else.

Airspy HF+ Discovery

Most noticeable differences are lack of metal casing which if present, could be useful in noise and interference reduction, and it has only a single SMA port which is fine for simple setup with single wideband scanner antena, but it’s definitely problematic for someone using separate HF and VHF antennas for better gain and performance. Similarly to dual port model, this device also uses micro-USB port which can potentially cause some troubles. If you stumble upon a connection problem when your computer doesn’t detect a device, or does detect but for some reason SDR software can’t connect to it, please check your usb cable. In my experience even good looking cables with no visible damage to the plug can be faulty, that’s why I’m using my trusted high quality cable filled with ferrite chokes/beads.

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