Siglent SDG 1025 as RF generator

Discussion in 'General Electronics Chat' started by atferrari, Mar 5, 2013.

  1. atferrari

    Thread Starter AAC Fanatic!

    Jan 6, 2004
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    For simple experiments in RF at around 10 MHz, I could have access to a SDG 1025 Siglent signal generator. Manual available here. I could be even buying it.

    What could be missing for it to serve as a proper RF generator?

    Somebody suggested to look at the capability to attenuate the output. I would dare to add, stability, but lacking previous experience I am not sure what to look at.

    No RF generator is available around here so this seem the sole option I have, if at all.

    Comments appreciated.
     
  2. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    Reading the specs, the sample rate is 125Msa/s.
    At 10 Mhz, the signal will be created in 12.5 steps.
    I am affraid that the signal might contain quite some harmonics.

    If you could order in germany, you could take a look at thsi DDS genarator:
    http://www.box73.de/product_info.php?products_id=2266

    Bertus
     
  3. crutschow

    Expert

    Mar 14, 2008
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    According to the spec sheet the harmonic distortion at 10MHz sinewave output is -35dBc which corresponds to about 1.8% distortion. That would seem acceptable for most non-critical applications.
     
  4. atferrari

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    What about using the output for RF tests? It seems rather high.

    Could I go away with an attenuator? I fear to enter in new set of problems with that.
     
  5. crutschow

    Expert

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    Do you mean is the distortion too high for RF tests? Unless they are very critical tests, I don't think so. RF distortion is usually not a big concern.

    An attenuator won't affect the distortion, but you may need one if you are testing the low level input of an RF amplifier.
     
  6. atferrari

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    I meant the output level. Isn't it excesive?
     
  7. crutschow

    Expert

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    It is for low level RF amp testing. For that you may need to get down to microvolt levels which would require an attenuation of about 60dB. You can buy BNC fixed coax attenuators for this purpose.
     
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