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Noise-Source-with-2xGVA82-15dB.php    6987 Bytes    07-10-2024 14:44:59


An easy to build Noise Source


This is the final Version. ENR : 12.0 ±0.5 dB





The photomodel shows the final version combining all components necessary to make this a nifty gadget. BOM is approx. 99 CHF.



In case you want a DIY Noise Source with good Performance, use this one. It combines all insights we got in building several designs with different Gain Blocks and Attenuators.





✈ Preface




This is a combination of all insights we got in building Version 2 x GALI and Version 3 x GALI.

We tested the following assemblies (ENR @ 500 MHz) :

AMP 1AMP 2ATT [dB]ENR [dB]
GVA-81+GVA-81+029.1
GVA-81+GVA-81+1019.1
GVA-81+GVA-81+6+617.1
GVA-81+GVA-81+6+1013.1
GVA-81+GVA-81+6+10+310.1




✈ Performance




The graph below shows the comparison to an Ailtech S-4241 (10 MHz to 18 GHz, 15.5 dB ENR). We think : not to shabby at all.



With 2 x GVA-81+ and PAT-10 + PAT-6 the ENR value is : 12.0 ±0.5 dB.

And yes, we know that graphs end, where data becomes unflattering. Please believe me, my colleague can only measure up to approx. 1.7 GHz. THANK YOU HB9SCT !




✈ S11 - The Output matching




ON ... better 20 dB up to 1 GHz
OFF ... better 20 dB up to 1 GHz

As some Tester will switch the Noise Source ON and OFF, the Output matching must be very good, in both cases. In terms of ENR, we measured the following values :

FREQUENCY [MHz]ENR [dB]
50012.0 ±0.5
100012.0 ±0.5
200012.0 ±0.5
300012.0 ±0.5




✈ Downloads








✈ Share your thoughts



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t1 = 6685 d

t2 = 200 ms

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