Tech

Broadcast technic:

 

HF band conditons: https://www.qrz.com/

Transmitters for broadcasting AM     

Former Mike Radio transmitters: 

Rohde & Schwarz SK 050 (valve technology )

 

Telefunken S2525/3 (transistor technology)  @ picture right one

 

 

Nowadays Mike Radio broadcasts with most accurate dds/mosfet technology  (as driver). In combination with a 6000 voltage  power tube for the ultimate  audio performance:  Eimac 4CX3000A  (as final stage ánd audio modulator – Class A). The modulator  is direct fed by  audio (mosfet/bridge) amplifier Behringer KM  750 watt  to support a powerfull and clear AM sound.

 

 

high voltage power valve Eimac 4CX3000A  (operating @ 6000 volt )

 

 

 

 

 

  • Dipole antenna  for shortwave broadcasting:  

half wave dipole:  L =  20 mtr    

  • Inverted L antenna for mediumwave broadcasting : 

                                                part of the  Inverted L  antenna  (50 meters lenght)

 

 

Audio for broadcasting AM: 

Audio-processor:   BW Broadcast DSPX – AM    for the best radio audio performance

AM broadcast audioprocessor

“the  soul of the station sound”

 

 

Accurate  audio control on negative  & possitive  modulation peaks .

      Mike Radio engineers are frequently  experimenting  to obtain the best audio performance.

 

SDR audio picture: to make audio visible. Made by  Nicolas living near Paris (France) using  ‘Airspy HF’,   freq.  4895 kHz,  on 8th april 2021 around 18.30 UTC (= 20.30 CET local time).

 

Here below you can hear the audiofile from Nicolas that belongs ‘to the picture’ above:

This is the average reception quality @ the afternoon/evening,  which can be expected on 4895 kHz,  at a distance like Paris, London, Berlin and  Copenhagen.