It's all about the Software

Can anyone tell me what signal level to expect from the PSK beacon on QO100 via Pluto and SDRC?

At the moment mine seems quite low at -112dBm or S2 but listening via the batc Goonhilly sdr it is about s9+10db. I am using a 90cm dish and 0.1 lnb.

Thanks

David,
Signal strength readings mean nothing.
Compare the Signal to Noise Ratio, then decide if anything is wrong.
73 Alan G4ZFQ

Alan

Fair comment. The Goonhilly snr is about 18dB and my Pluto is about 10dB.

What do others get?

Hi
1 meter dish, lnb,Limesdr
abt 30-35 db 'eyeball' on the signal history display
SNR by Simon's compute: 30-40 db


de Joe 4X1RV.

I should have thought, even that is not so simple.
You have to know what bandwidth the SNR is being measured in to be able to compare.
An interesting point. I've no figure for when I tried, must get it going again.
The SNR however you measure it should be set by the time the signal leaves the LNB. Dish size/aim/efficiency/LNB noise. Anything following it must not increase the noise level. I'd expect every receiver to be much the same on any one system.
As David says "What do others get?" Maybe better answered in a dedicated QO100 group?
73 Alan

I re-aligned the dish and lnb and tried other lnb's and now have a snr of 20-23dB. This is better than it was but I can't get any where near the 30dB others have mentioned.

Thanks to all.

M0TGC wrote: Sat Jan 23, 2021 1:02 pm I re-aligned the dish and lnb and tried other lnb's and now have a snr of 20-23dB. This is better than it was but I can't get any where near the 30dB others have mentioned.

Thanks to all.

I would like to see screenshots of SNRs of 30dB on the beacon - despite a 1.4m dish I can't achieve this.

Hi Simon.

Attached a screenshot shoing S/N of 38 (get 32-40 depending of the data on the beacon).

Hi Simon,

1.8m offset dish with LNB "looking" through the feed helical antenna, getting an SNR of around 39dB for the CW beacon and around 28dB for the data beacon @ 1.2MHz bandwidth


Vy 73

Geri, DK8KW

Hi
To add: Just noise is S6 S5 on signal history

So levels are similar to the display of the Goonhilly site...