It explains a lot about the EFHW and also about how to build and measure very high ratio Bal-un .
From the Perseus.io group .
Associazione Italiana Radioascolto www.air-radio.it - info@air-radio.it LEGGI LA RIVISTA RADIORAMA WEB SU: WWW.AIR-RADIO.IT La collaborazione al Blog AIR Radiorama e' aperta a tutti gli appassionati, previa richiesta di iscrizione tra gli Autori. Il CD AIR si riserva il diritto insindacabile di decidere l'ammissione degli Autori e la pubblicazione sul Blog dei relativi articoli inviati.
Visualizzazione post con etichetta Measurements. Mostra tutti i post
Visualizzazione post con etichetta Measurements. Mostra tutti i post
lunedì 24 gennaio 2022
giovedì 13 gennaio 2022
domenica 2 febbraio 2020
Elenos Signal Predator measurement with several IF frequencies of receivers
The main features of Elenos Signal Predator are :
- Direct Sampling SDR - 16 bit precision
- Continuous measurement of the audio S/N without switching off the program (Patent Pending)
- Frequency coverages ( always FM Demodulation only ) :
74 - 108 MHz (VHF Input)
10.7 – 21.4 (HF Input) ; 70 – 140 MHz (VHF Input)
(Typical STL IF Monitor frequencies for WFM )
and whatever frequency from 10 kHz to 54 MHz (HF Input)
The video shows Signal Predator while measuring signals at 10.7 MHz on the IF output of two ELCA STL 2 GHz links, directly on air at 106.6 MHz and , again on air at 106.6 MHz , but using a Rohde Schwarz test receiver and the two IF output at 74.7 MHz and 10.7 MHz .- Direct Sampling SDR - 16 bit precision
- Continuous measurement of the audio S/N without switching off the program (Patent Pending)
- Frequency coverages ( always FM Demodulation only ) :
74 - 108 MHz (VHF Input)
10.7 – 21.4 (HF Input) ; 70 – 140 MHz (VHF Input)
(Typical STL IF Monitor frequencies for WFM )
and whatever frequency from 10 kHz to 54 MHz (HF Input)
sabato 7 settembre 2019
venerdì 21 giugno 2019
Signal Power measurement on air - steady and in mobility with SDR receivers
Recently I raised a question how to
measure the power received from an SDR receiver .
Ham use S-meter scale , while for professional use a scale in logarithmic
units ( dBm , dBuV , dBuV/m)is required . Conversion is mathematically easy .
Most of the software have both S-Meter and dBm or dBm(r) where (r)
stands for relative .
Some software use different settings depending on the type of modulation
of signal that they have to measure and demodulate , while some other no .
Some software give steady measurements , independently from modulation ,
some other no .
I have made a series of video showing the reasons why .
I have choose three kind of modulations : WBFM ( used in the 87.5-108
MHz Broadcasting Band) , DAB and the old AM used in Medium Waves .
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