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Synthesizer

Important Synthesizers for ResLab

Typ Synthesizer Application Frequency [Hz] RF-Power [dBm] Reference Comment
Marconi 2024 Reprate 1 000 000 226 7 Passive H-Maser
Marconi 2024 Amplifier for 10 MHz distribution 10 000 000 14 Rb Clock
Marconi 2024 Stell-AOM Mixdown 74 940 000 7 Rb Clock
Marconi 2024 Free was broken
Marconi 2023B Free
Rhode&Schwarz SMC100A Free
Rhode&Schwarz SMC100A 30m Fiber stabilization Reference 160 222 000 4 Rb-Clock
Rhode&Schwarz Hameg HM8134-3 30m Fiber stabilization 80 111 000 1.4 Rb-Clock * ext. Mod. on (400 kHz Dev.)
* Name: AOM2
* Shit stability
Rhode&Schwarz Hameg HM8134-3 Free Shit stability!
MG520 M Frequency Generator EOM R1 13 810 000 10 Rb-Clock
Rhode&Schwarz SMH 845.4002.52 EOM R2 16 200 000 13 Rb-Clock
Rhode&Schwarz SML01 Double-pass AOM R1 104 630 000 + Computer 13 Rb-Clock * Name: AOM0
* located in upstairs-Lab
Rhode&Schwarz SMC100A * Linewidth Lock with Blue AOM R1
* 5m Fiber stabilization 		77 111 000 2 Rb-Clock * Name: AOM1
* located in upstairs-Lab
Rhode&Schwarz SMY01 5m Fiber stabilization Reference 77 111 000 5 Rb-Clock * Name: AOM1
* located in upstairs-Lab
Double-pass AOM R2

Specks

Typ Synthesizer Phase Noise @ 1 GHz [dBc] Resolution [Hz]
Marconi 2024 -90 @ 100 Hz
-100 @ 1 kHz
-115 @ 10 kHz
-121 @ 20 kHz 		0.01 < 100 Hz
0.1 < 1 kHz
1 < 20 kHz
Marconi 2023B -75 @ 100 Hz
-100 @ 1 kHz
-112 @ 10 kHz
-121 @ 20 kHz 		1
Rhode&Schwarz SMC100A -45 @ 1 Hz
-70 @ 10 Hz
-82 @ 100 Hz
-100 @ 1 kHz
-115 @ 10 kHz with internal OCXO 		0.1
Rhode&Schwarz Hameg HM8134-3 -15 @ 1 Hz
-50 @ 10 Hz
-80 @ 100 Hz
-100 @ 1 kHz
< -100 @ 10 kHz 		1
Rhode&Schwarz SML01 -95 @ 1 Hz
-120 @ 10 Hz
-130 @ 100 Hz
-138 @ 1 kHz
-148 @ 10 kHz with 9.5 MHz output frequency
-128 @ 20 kHz with 1 GHz output frequency 		0.1

Marconi Synthesizer

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): 1 Ext 10MHz direct

(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

Solved Problems:

  1. Problem: No Output Signal
  • Solution: Transitor TR708 was broken. The Transistor has been replaced by a BC847 Transitor.

Marconi Synthesizer 2023B (ehemals ausgeliehen von Q-Port)

Rohde&Schwarz Synthesizer

Rohde&Schwarz Synthesizer SMC100A

Rohde&Schwarz Synthesizer SML01

Rohde&Schwarz Synthesizer Hameg HM8134-3