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TOPIC: ExpertSDR2 , s-meter precision

ExpertSDR2 , s-meter precision 14 Nov 2020 18:47 #1

Hi Forum
I'm just owner of Colibri DCC with out LP filter kit .
I see that value of signal s-meter is too much strong respect real .
Where i can adjust ?
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ExpertSDR2 , s-meter precision 16 Nov 2020 06:46 #2

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1. Please take a look at the FAQ, section ExpertSDR2, questions# 6. 9.
2. What are the noise floor and S-meter values without antenna?
Роман, Roman
Expert Electronics
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ExpertSDR2 , s-meter precision 16 Nov 2020 19:09 #3

Hi Roman
I take a look @ FAQ on point #6 and #9 and done some test playing with Attenuation and other feature :
Without antenna in the connector i see this values:
the lowerest signal i obtain with "Front and Preamp" on and with 0 Db Attenuation level : S6 with -92.1dbm
with still "front and preamp" on but with -20Db attenuation : S9 with -74.7 dbm
Simple Rate is 312 Khz
Nb : antenna is ALA 1530

Many thanks for Help
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ExpertSDR2 , s-meter precision 17 Nov 2020 06:39 #4

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Please check with the disabled front end and preamp.
Роман, Roman
Expert Electronics
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ExpertSDR2 , s-meter precision 17 Nov 2020 10:29 #5

Hi Roman
If i disabled front/ preamp with no antenna , noise grow up .
Best regards, Sandro
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ExpertSDR2 , s-meter precision 18 Nov 2020 12:08 #6

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Do you have a signal generator with a known signal?
Can you apply this signal on the receiver and compare it with what you see in the software.
Роман, Roman
Expert Electronics
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ExpertSDR2 , s-meter precision 09 Dec 2020 14:02 #7

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Just did the upgrade to Version 1.3.1 Update 7. Seems OK until it asked me to upgrade the Firmware. Now the S-Meter is reading 20dB with 50microvolt in.
Before firmware update, baseline (no antenna) s meter read about S-1 no4 reads S-5.

Ed Rios KP4AKB/W8
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ExpertSDR2 , s-meter precision 09 Dec 2020 15:30 #8

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version 9.3
Attachments:
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ExpertSDR2 , s-meter precision 24 Dec 2020 17:53 #9

Hi crew
Yes happend the same to me when i updgraded to 1.3.1
:wall:
Last Edit: 24 Dec 2020 17:54 by Alex65.
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ExpertSDR2 , s-meter precision 27 Jun 2021 21:06 #10

I have the ColibriDDC for about a year.. The S meter never worked correctly with any versions. Software is fine btw.
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ExpertSDR2 , s-meter precision 13 Jan 2022 15:01 #11

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S meter accuracy still persist on ColibriDDC
With 50 uv (S9) meter reads S9 + 35dB

SMetertoohigh.jpg
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