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27. July 2026
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Noise-Source-with-2xGVA82-15dB.php 6987 Bytes 04-03-2025 19:13:19
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) :
We tested the following assemblies (ENR @ 500 MHz) :
| AMP 1 | AMP 2 | ATT [dB] | ENR [dB] |
| GVA-81+ | GVA-81+ | 0 | 29.1 |
| GVA-81+ | GVA-81+ | 10 | 19.1 |
| GVA-81+ | GVA-81+ | 6+6 | 17.1 |
| GVA-81+ | GVA-81+ | 6+10 | 13.1 |
| GVA-81+ | GVA-81+ | 6+10+3 | 10.1 |
✈ 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 !
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
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] |
| 500 | 12.0 ±0.5 |
| 1000 | 12.0 ±0.5 |
| 2000 | 12.0 ±0.5 |
| 3000 | 12.0 ±0.5 |
✈ Downloads
✈ Share your thoughts
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t1 = 7319 d
t2 = 310 ms |
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