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by g1hbe
Thu Apr 11, 2019 7:42 am
Forum: Spectrum Analysis
Topic: Different Spectrum Analyser with different RSP's?
Replies: 6
Views: 656

Re: Different Spectrum Analyser with different RSP's?

If you mean the difference in displayed noise, haven't you got the averaging on in the second shot?
by g1hbe
Tue Apr 09, 2019 7:48 am
Forum: General
Topic: Spectrum Noise Floors: Reasonable ?
Replies: 7
Views: 660

Re: Spectrum Noise Floors: Reasonable ?

It's also worth experimenting with your earth (ground) system, as ground loops can cause terrible noise injection. Through experimentation I have found that antenna grounds that are also used as equipment grounds can inject a lot of noise into a receiver. As a result I keep the grounds separated an...
by g1hbe
Mon Apr 08, 2019 11:35 pm
Forum: General
Topic: Spectrum Noise Floors: Reasonable ?
Replies: 7
Views: 660

Re: Spectrum Noise Floors: Reasonable ?

Re the usb lead, I've heard the Trip-Lite ones are quite good: https://www.amazon.co.uk/Tripp-Lite-U023-006-Ferrite-Chokes-Black/dp/B003MQ29B2 They have a ferrite at each end so they radiate less hash. It's also worth experimenting with your earth (ground) system, as ground loops can cause terrible ...
by g1hbe
Mon Apr 08, 2019 12:25 pm
Forum: General
Topic: Spectrum Noise Floors: Reasonable ?
Replies: 7
Views: 660

Re: Spectrum Noise Floors: Reasonable ?

Hi Bob and welcome. I'd say your noise levels are fairly typical. Long wires are very prone to local noise, and with every one having their homes crammed with digital electronics these days things are getting worse. One major source of noise which has appeared more recently is VDSL, which appears in...
by g1hbe
Mon Apr 08, 2019 9:47 am
Forum: General
Topic: AM broadcast bands on all frequencies / bands (SDR2/SDRUno)
Replies: 4
Views: 561

Re: AM broadcast bands on all frequencies / bands (SDR2/SDRUno)

Hi Kerchunk. I have the RSP2 and a couple of big MW BC stations nearby. I use a Wellbrook loop antenna. The only way I can get overload is by turning the RF gain near full (or the RF attenuation to the bottom). Have you checked the setting of this slider? Remember that if it is in 'attenuation' mode...
by g1hbe
Fri Mar 29, 2019 12:07 pm
Forum: SDRuno
Topic: re: having to reset to defaults on sdruno start up
Replies: 17
Views: 2158

Re: re: having to reset to defaults on sdruno start up

Plus - a bit more info on the 'max RF gain on startup' thing. It only does this this if the Hi-z input is selected. It also goes full gain when moving from Ant A to Hi-z.
by g1hbe
Fri Mar 29, 2019 8:31 am
Forum: SDRuno
Topic: re: having to reset to defaults on sdruno start up
Replies: 17
Views: 2158

Re: re: having to reset to defaults on sdruno start up

Thanks Paul. Ye's that's the kind of unfathomable behaviour I'm seeing, along with the occasional selection of 100 kHz step size in narrowband modes if I've come from WFM. I think it must depend on which way the wind is blowing....
by g1hbe
Wed Mar 27, 2019 1:34 pm
Forum: New Users' experiences
Topic: S-METER READING
Replies: 15
Views: 2536

Re: S-METER READING

The only thing you measure is the voltage at the input-plug of the receiver. It doesn't say anything about the signal, antenna-system, cable losses, conditions in the sky, etc. Also, on HF it's 50μV for S9 but on VHF 5μV, so on VHF you should see a different reading. But it's just that, a μV number...
by g1hbe
Mon Mar 25, 2019 9:11 am
Forum: SDR Antennas
Topic: Longwave Antenna Reception For Apartment
Replies: 6
Views: 1204

Re: Longwave Antenna Reception For Apartment

Hi Adam. I had exactly the same problem years ago but a Wellbrook 1530 loop saved my hobby. The noise with outdoor wire antennas had grown over the years and was reaching S9, blocking all but the strongest signals. I tried a remotely-mounted E-field 'probe', but it was just as bad as the wires. So o...
by g1hbe
Sun Mar 24, 2019 1:16 pm
Forum: SDRuno
Topic: re: having to reset to defaults on sdruno start up
Replies: 17
Views: 2158

Re: re: having to reset to defaults on sdruno start up

No Paul - I installed Uno on my other laptop and the 'empty window' doesn't appear on that one. On the old i3, I think I'll uninstall, do a registry cleanup and re-install. If that doesn't clear it I'll just live with it. It's not exactly the end of the world, just an extra click on shut-down.

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