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Marconi Synthesizer

TODO: Welcher typ synthesizer ist noch im Raum? und welcher typ mit den jeweiligen Einstellungen eintragen

Marconi Synthesizer 2024

  • Manual 2024: ifr_2024_datasheet.pdf
  • possible settings: Frequenzbereich von 9 kHz bis 2,4 GHz, Auflösung 1 Hz, Ausgangspegel von -140 bis +13 dBm, Auflösung 0,1 dB, interne 2-Ton-Modulationsquelle für Sinus, Rechteck und Dreieck, lineare und logarithmische Wobblung, AM, FM, pM, Puls und FSK, Rückleistungsschutz bis 50 W, LC-Display, nummerische Tastatur, GPIB und RS-232

Options
01 No attenuator
03 high Power
04 high stability frequency standard
11 Fast pulse and high power

  • Error message: “External reference is missing!!!”
  • Important: External(Ext): <fc #4682b4>1 Ext 10MHz direct</fc>

(MENÜ)-Button → Frequency/Sweep (Select) → 4 Frequency standard (Select) → 1 Ext 10MHz direct

  • Possible errors: no Rb-referenz/ GPS/ OXCO connection or wires connected?
  • Normal state (10MHz):

Synthesizer is broken?

Manual for repair: http://www.ko4bb.com/getsimple/index.php?id=manuals&dir=Marconi
Quick repair project (Marconi 2024): a forum where severel defects are presented and explained how to fix them: http://www.eevblog.com/forum/repair/quick-repair-project-marconi-2024/
Output signal (dBm) is too small: Probably the amplifier is broken. Check backwards the signal inside the synthesizer with a measuring tip.

  1. Adjust the frequency of the half from the maximal Oszi-frequency
  2. Measure the distance between the minimum and maximum sinus-signal. Half of the distance devide by root(2) provide the effective voltage
  3. Use the data sheet for dBm calculation: dbm-volts-wattconversion.pdf

Marconi Synthesizer 2023B (Q-Port)