SDRplay Community Forum

Hi Glenn. The man speaks the truth. I think many of the observations about 'poor performance' of the RSP2 come from people who have not understood (or even read) the recommendations re the various antenna ports. I'm a MW and LF enthusiast and the difference between the Hi-z input and the two SMA por...

Hi Steve. Just a silly question, you are selecting port B are you? Sorry, I had to ask. Onto the MW/FM filters - On ports A & B the MW/FM notches work very well, but the lower frequency limit of the MW notch is 680 KHz so maybe it's not so effective at 640. The MW/FM notch does not work on the Hi-z ...

I don't know for sure, but I suspect the RSP2 looks for an ext clock on start-up, and if you apply the ext clock after it has started up it will not 'see' it and will use its internal clock. (Could be wrong, usually am!).

What kind of interference is it, and can you narrow down the source - RSP or computer?

Heinrich - I've just checked the noise on the Antenna B input with the bias-T enabled/disabled. I can detect nothing, even with the scope on 5mV with a x1 probe. Clean as a whistle. Of course, this may just mean my particular laptop is clean!

I've noticed something odd about the bias T. If I have had it ON and then shut down the receiver, when I start up again it says the bias T is still powered but it is not. To make it work I have to turn the T off then on again.

Jukka - if you want to use off-the-shelf filters, you will need to transform to 50 ohms on the input side and then back up to 1k to feed the RSP. Not ideal. A better solution would be to download an RF package (something like RFSim99) and use it to design your own filter for a 1000 ohm system. All y...

Yes but then the waterfall/spectrum display would not show up to 10 MHz wide! You can't have it both ways, this is the problem.

If you really need to see 10 MHz at a time, then you are certainly going to need a bit of horsepower. For general listening around, I find a couple of MHz (or less) of BW is enough, and my laptop i3 @ 2.4 GHz (with 4 Gigs of ram and onboard graphics) copes well. It actually works flawlessly up to ab...

I think I've seen this documented somewhere. There are responses based on odd harmonics of the sampling frequency/LO. Just like the 'image' response on a conventional superhet receiver, there is no way to get rid of them without using front-end filtering. The RSP's have filters, but the lowest one c...