Category Archives: Transceiver

Steckt sie alle in die Tasche: Reuters “Pocket”


Burkhard Reuter mit seinem “Pocket”: Eine Entwicklung, auf die er stolz sein kann

Wo eigentlich bleiben die Weltempfänger? Die Spitzenklasse kommt heute nicht aus Japan und schon gar nicht mehr aus den USA oder aus Fürth, sondern aus: Dessau. Dort hat Burkhard Reuter unter anderem seinen Pocket entwickelt. Das ist ein Taschenempfänger, den es auch mit Sendeteil gibt. Seine Leistung ist absolute Spitzenklasse. Sein Konzept folgt einem ab initio selbst entwickelten und “Spectrum Based Signal Processing” genannten Algorithmus. Alles an diesem Gerät ist schlichtweg außergewöhnlich: von der Leistung über die Wertigkeit bis zum Preis. Für die Titelgeschichte der Mai-Ausgabe 2017 der Fachzeitschrift FUNKAMATEUR habe ich Burkhard Reuter in seiner Werkstatt besucht, mir seinen Weg und sein Konzept erläutern lassen sowie seinen Receiver auf Herz und Nieren getestet.

Where have all the world band radios gone? The most recent one – and probably the best ever produced – emerged out of the workshop of Burkhard Reuter (pictured above) from Dessau/Germany, the city of Bauhaus fame. For the cover story (May, 2017) of the German FUNKAMATEUR magazine, I visited him and did an in-depth test of this smart receiver, following his unique “Spectrum Based Signal Processing” algorithm. His Pocket turned out to surpass reception quality of each and every world band radio before, scratching the performance of even professional table top receivers. Some versions of it also include a ham radio transmitter (QRP). Already another modern classics from the Bauhaus city …


LimeSDR: First Experiences on HF

One hour in the 20 m ham radio band with LimeSDR and SpyVerter, zoomed out of a one hour’s recording of 30 MHz width. Antenna: quadloop of 20 m circumference.

LimeSDR is a Crowdsupply project – delivering an SDR which covers 100 kHz to 3.8 GHz with bandwdiths of up to 2 x 30 MHz. I was interested almost exclusively in the range 100 kHz to 30 MHz. The board arrived on March 17th, and I already have done some tests with it. From these very first results & a recommendation:

  • Installing is easy (W10), if you follow the instructions.
  • Without modification, LimeSDR is simply useless on HF. It’s deaf near to a dummy load.
  • The producer recommends a “modification” by just removing one SMD. Then some life came into this range. But it was hard to sort the ghost stations from the real ones.
  • Even a low-pass filter from Heros didn’t helped that much.
  • Just before selling the board on ebay, I connected the antenna first with Spyverter – a state-of-the-art up-converter with an IIP3 of +35 dBm, transferring the band of 0 – 30 MHz to 120 – 150 MHz. This is a range, where LimeSDR sees some light.

So, if you are disappointed by the near-non HF performance of naked LimeSDR: an able up-converter will change the game. Recording and sonagrams had been made with V3.

30 MHz live with LimeSDR and SpyVerter shows that it generally works. Same antenna as above.

“Ghost signals” make it sometimes difficult to distinguish them from real signals. This sonagram has been made with SpyVerter. Broadcast stations are easy to find out (in their majority). But it gets difficult to sort the ghost stations from the few real ones in the left part.


SDR Transceiver Zeus ZS-1 and Digimode Software FLDIGI

A strong combination: State-of-the-Art SDR transceiver Zeus ZS-1 and digimode software FLDIGI. with this insutrction, the combination of both with audio in/out, keying and freqeuncy transfer is easy.

A strong combination: State-of-the-Art SDR transceiver Zeus ZS-1 and digimode software FLDIGI. With a step-by-step instruction, the combination of both with audio in/out, keying and freqeuncy transfer is easy.

With software-defined radio or SDRs, also ham radio has made a considerable leap forward. SDR transceivers are around for many years but failed to have a major impact until now. Among these transceivers, Russian and German-made Zeus ZS-1 is an outstanding example, covering each amateur radio band from 160 m to 10 m with up to 15 watt output. It received enthusiastic reviews around the world, e.g. by RadCOM of RSGB and QST of ARRL with excellent ratings.

Recently, I again bought on ZS-1 to re-vitalize my amateur radio activity with also again a focus on QRP and digital modes. For this purpose, ZS-1 with its outstanding clean signal under transmit and Receiver plus tidy interface is almost ideal. BUt Ehen I needed a fool-proof instruction to set up the combination of ZS-1 and a multimode software like FLDIGI, I didn’t found what I need: a step-by-step approach.

This was the reason for writing such an instruction by myself. I concentrate on the combination of ZS-1 and FLDIGI which in a PDF is laid out in detail and with instructive screenshots. In an appendix, I go also through some other digimode software like FreeDV and EasyPal. To my own disappointment, I couldn’t get work WSJT/WSPR. So your help is very appreciated!

You can download the 20-paged PDF with its 24 screenshots right here.