Эксперт Электроникс - Expert Electronics - Topic: S3 signal without Antenna (1/1)

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This category was created to discuss various questions and topics regarding ExpertSDR3 operation.

TOPIC: S3 signal without Antenna

Signal without Antenna 03 Aug 2022 16:29 #1

XV9BPO OFFLINE Posts: 12	Hi guys, Just wondering. Is it normal that even without antenna the signal does not go below S3 or around -111.7dbm ? I am using ESDR3 0.12.1 Thanks for your help
	Last Edit: 03 Aug 2022 16:30 by XV9BPO. The administrator has disabled public write access.

Signal without Antenna 03 Aug 2022 18:53 #2

N8SDR
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Posts: 160
Thank you received: 137

XV9BPO wrote:

Hi guys,

Just wondering.
Is it normal that even without antenna the signal does not go below S3 or around -111.7dbm ?
I am using ESDR3 0.12.1
Thanks for your help

YES, a true direct sampling SDR will always have / show a noise figure

you notice if you engage the preamps the noise floor without antenna will decrease as well again this is correct

it is created from the components

Please do not email me and ask for help I no longer will be part of this, If I could delete /remove my profile I would do so.

The administrator has disabled public write access.

The following user(s) said Thank You: Rome

Signal without Antenna 03 Aug 2022 20:31 #3

W3FRG OFFLINE Posts: 10 Thank you received: 3	Hello, Regarding the S5 S-Meter reading, one of the best explanations I've seen is on the Flex site. Back before I upgraded to the Dx, my 6600M did this and I also asked the same question. The explanation can be seen here: community.flexradio.com/discussion/5523377/why-does-my-s-meter-read-s5-all-the-time GL Tom W3FRG
	The administrator has disabled public write access. The following user(s) said Thank You: Rome, g7mns

Signal without Antenna 03 Aug 2022 20:42 #4

XV9BPO OFFLINE Posts: 12	Thanks to both of you for your answers
	The administrator has disabled public write access.

Overall software operation

S3 signal without Antenna

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