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TOPIC: RX2 S-Meter

RX2 S-Meter 28 Jul 2020 21:34 #1

  • N1KIN
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I never noticed this before, so not sure if it is just from this latest update or not, but when I enable RX2, with all the same settings, I notice a -4 S-unit (≈ -24dB) difference in S-meter readings on RX2 vs. RX1. Everything sounds fine, but noticed this meter reading is much lower. There is also a CW signal present on RX2 at approx 3.894, that does not show up at all on RX1. Very odd?? I use A2 input for HF as my default.
Note: for an additional test (not shown) I keep a dummy load attached to A3 input at all times for testing, and when I switch RX1 and RX2 over to A3 input, the RX1 noise floor then reads -120.4dB, while RX2 shows -142.4 dB noise floor. This is an approx -22 dB difference between RX1 and RX2.

Rig is SunSDR2 DX, running latest updates; v1.3.1 Update 6, version 57.8, PA firmware version 12.
All else is good... what gives, have I missed something very simple, or is this just a bug with S-Meter code?
Thanks,
N1KIN
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RX2 S-Meter 30 Jul 2020 14:32 #2

  • Rome
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Hi Terry.
Thank you for the report, could you please send us a short video or screenshot of the issue.
Роман, Roman
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RX2 S-Meter 30 Jul 2020 17:39 #3

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Thanks for responding Rome, there is already full screen grab jpg attached to the OP. If you look closely, you'll see that I am tuned to 3.900mHz in main RX1 which is relatively quiet, and little band activity around it aside from local noise. RX2 is opened beneath RX1, tuned to exact same frequency, mode, filter bandwidth etc. Note the two S-meter readings, and the ≈24 dB spread in readings between two S-meters tuned to same freq and same input. If I switch each to A3 input (dummy load), same approximate disparity exists between RX1 & RX2 S-meters at the noise floor.
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RX2 S-Meter 30 Jul 2020 17:40 #4

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Rome, jpg screen shot attached to OP. Also forgot to mention this same condition exist on every band when RX2 is selected, including 2M.
Last Edit: 30 Jul 2020 18:00 by N1KIN.
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RX2 S-Meter 31 Jul 2020 06:33 #5

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Sorry, I missed it, thanks, passed it to the programmer.
It might be related to the firmware, in this case it'll be fixed later this year.
Роман, Roman
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