Search found 216 matches

by g1hbe
Sun Jul 23, 2017 9:31 am
Forum: SDRplay related
Topic: RSP2 LO 3rd harmonic spurious response only -20dBC
Replies: 17
Views: 1812

Re: RSP2 LO 3rd harmonic spurious response only -20dBC

Thanks Wolfgang. These cores (picked up for almost nothing at a rally) measure very much like mix 43. I see Mouser sell the 73 equivalent, which should be much better. Thanks.
by g1hbe
Fri Jul 21, 2017 11:38 pm
Forum: SDRplay related
Topic: RSP2 LO 3rd harmonic spurious response only -20dBC
Replies: 17
Views: 1812

Re: RSP2 LO 3rd harmonic spurious response only -20dBC

Hi Glennfin. It's not ideal because it's just more 'stuff' in the signal path. And assuming it's a ferrite based device, there's always the possibility of increased loss at certain frequencies. Many ferrites used in popular low-cost transformers and baluns have poor performance at frequencies below ...
by g1hbe
Wed Jul 19, 2017 8:34 am
Forum: SDRplay related
Topic: Couple of RSP2 Newbie Questions...
Replies: 4
Views: 611

Re: Couple of RSP2 Newbie Questions...

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...
by g1hbe
Fri Jul 14, 2017 5:46 pm
Forum: General
Topic: Having bad AM broadcast interfernce
Replies: 8
Views: 1166

Re: Having bad AM broadcast interfernce

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 H...
by g1hbe
Wed Jul 05, 2017 1:45 pm
Forum: SDRplay related
Topic: RSP2 Clock Sharing
Replies: 2
Views: 348

Re: RSP2 Clock Sharing

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!).
by g1hbe
Tue Jul 04, 2017 3:22 pm
Forum: General
Topic: interference problems
Replies: 5
Views: 785

Re: interference problems

What kind of interference is it, and can you narrow down the source - RSP or computer?
by g1hbe
Sat Jul 01, 2017 6:53 pm
Forum: SDR Antennas
Topic: Bias T and active mini-whip
Replies: 15
Views: 1643

Re: Bias T and active mini-whip

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!
by g1hbe
Fri Jun 30, 2017 10:56 pm
Forum: SDR Antennas
Topic: Bias T and active mini-whip
Replies: 15
Views: 1643

Re: Bias T and active mini-whip

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.
by g1hbe
Fri Jun 30, 2017 8:14 am
Forum: SDRplay related
Topic: RSP2 LO 3rd harmonic spurious response only -20dBC
Replies: 17
Views: 1812

Re: RSP2 LO 3rd harmonic spurious response only -20dBC

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...
by g1hbe
Thu Jun 29, 2017 9:20 pm
Forum: SDRplay related
Topic: RSP2 LO 3rd harmonic spurious response only -20dBC
Replies: 17
Views: 1812

Re: RSP2 LO 3rd harmonic spurious response only -20dBC

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.

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