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by g1hbe
Mon Apr 22, 2019 7:37 pm
Forum: SDRplay related
Topic: 75/50 ohm for RSP1a connection
Replies: 2
Views: 76

Re: 75/50 ohm for RSP1a connection

There's no need to convert. The mismatch loss will be tiny and the quoted impedances are nominal, likely to be significantly different from the spec anyway.
by g1hbe
Sun Apr 21, 2019 10:56 pm
Forum: General
Topic: SDRUno 1.31 with Windows 7 issue
Replies: 5
Views: 210

Re: SDRUno 1.31 with Windows 7 issue

I (along with many others) suffered slowdown on my old Win7 Pentium 6200 laptop a while ago. Long story short it turned out to be an update bug that caused the machine to constantly check for Windows updates and use virtually all the processor and memory. This is a very common one so maybe you've al...
by g1hbe
Fri Apr 19, 2019 10:35 pm
Forum: SDRuno
Topic: keep windows together
Replies: 2
Views: 175

Re: keep windows together

There's no way yet AFAIK. The MA button just allows that window to shut down all windows and close the program.
by g1hbe
Fri Apr 19, 2019 3:46 pm
Forum: Spectrum Analysis
Topic: Feedback for version 1.0a here
Replies: 88
Views: 9088

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: 152

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: 468

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: 88

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: 225

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: 421

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: 160

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).

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