Search found 475 matches

by g1hbe
Fri Apr 19, 2019 3:46 pm
Forum: Spectrum Analysis
Topic: Feedback for version 1.0a here
Replies: 100
Views: 27528

Re: Feedback for version 1.0a here

I would guess that like any RX, the '50 ohm' spec is purely nominal and will vary significantly with frequency, particularly when a filter band-edge is crossed.
by g1hbe
Fri Apr 19, 2019 7:48 am
Forum: SDRuno
Topic: New Computer - SDRUno and other software? AMD/Celeron?
Replies: 2
Views: 773

Re: New Computer - SDRUno and other software? AMD/Celeron?

If you can afford it, go with an i3, i5 or i7. Celerons are a bit 'bargain basement' and don't have very much puff. More memory is always a good thing and a decent PC will probably come with 8 or 12 GB. I run SDRUno on an i3 and an i5 and it works fine, although I rarely go above about 6 MHz bw. My ...
by g1hbe
Thu Apr 18, 2019 2:16 pm
Forum: SDRuno
Topic: How Do I Display More Spectrum?
Replies: 9
Views: 1593

Re: How Do I Display More Spectrum?

You can get spans of less than 2 MHz by selecting a 'DEC' of greater than 1. If the SR is set to 2MHz and the DEC to 1, you get (about) 2MHz of spectrum. Increasing the DEC to 2 will give you 1 MHz and DEC 4 will produce 500 KHz. Sorry if this has already been mentioned, but for some reason I'm find...
by g1hbe
Thu Apr 18, 2019 1:24 pm
Forum: SDRuno
Topic: Unwanted signal on FM from a local station
Replies: 2
Views: 669

Re: Unwanted signal on FM from a local station

You seem to have tried most of the dodges. Usually moving the spectrum sideways will cause a spurious signal to shift out of the way (assuming it really is a spurious generated in the receiver). Have you tried altering the sample rate/decimation?
by g1hbe
Thu Apr 18, 2019 1:20 pm
Forum: SDRplay related
Topic: FOR FM DX Which modell RSP
Replies: 4
Views: 1121

Re: FOR FM DX Which modell RSP

Hi. AFAIK there are no major performance differences between the models. I use the RSP2 because I like the ability to switch between two VHF/UHF antennas and also have a Hi-z input for my LF listening.
If you are concentrating on FM broadcast, the RSP1-a would be fine. They're all good.
by g1hbe
Thu Apr 18, 2019 12:22 pm
Forum: General
Topic: For Any HDSDR Users
Replies: 5
Views: 1334

Re: For Any HDSDR Users

Bob - the LO frequency is the Local Oscillator, and it produces the central spike when you are using 'Zero IF' mode. IIRC, with HDSDR there will always be an offset between the LO and the 'listening' frequency, as any attempt to listen on the LO frequency will cause distortion. The 'A' simply means ...
by g1hbe
Sat Apr 13, 2019 3:55 pm
Forum: General
Topic: Just hearing static
Replies: 1
Views: 622

Re: Just hearing static

Hi M. A common error is to tune to kHz instead of MHz. 'Native' frequency entry in SDRUno is kHz. If you want to use MHz, use the blue MHz button on the on-screen keypad.
If it's not that, you may have the wrong antenna selected (assuming you have the RSP2 or Duo).
by g1hbe
Fri Apr 12, 2019 8:09 am
Forum: SDRuno
Topic: Main Spectrum Settings / FFT Window choices?
Replies: 3
Views: 707

Re: Main Spectrum Settings / FFT Window choices?

A couple of obvious ones to kick off with - try changing the averaging to a higher value, you should see a 'smoothing' effect on the spectrum display and it will react more slowly too. This can be useful for seeing small signals in the noise. The RBW (resolution bandwidth) is like the IF bandwidth i...
by g1hbe
Thu Apr 11, 2019 7:42 am
Forum: Spectrum Analysis
Topic: Different Spectrum Analyser with different RSP's?
Replies: 6
Views: 1513

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: 1202

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...

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