Search found 240 matches

by g1hbe
Fri Jul 28, 2017 11:13 pm
Forum: New Users' experiences
Topic: Nothing But Noise on SDRUno
Replies: 9
Views: 1949

Re: Nothing But Noise on SDRUno

Frequency entry is a major bugbaer with me. It would be much better with separate keys for KHz and MHz, so you could enter 200K or 200M and be there in an instant instead of wondering about all those zeros. My Signal Hound spectrum analyser uses this method and it's a breeze!
by g1hbe
Tue Jul 25, 2017 8:33 am
Forum: General
Topic: NDB reception
Replies: 12
Views: 1518

Re: NDB reception

Well it's a bit of a mystery! Do you get good sigs from the LW broadcasters? I'm clutching at straws now, but despite your rural location, it is worth looking at what SDRUNo reports as your background noise level. When my local noises are not on in the daytime, I get around -110 to -120 dBM at LF on...
by g1hbe
Mon Jul 24, 2017 11:15 pm
Forum: General
Topic: NDB reception
Replies: 12
Views: 1518

Re: NDB reception

Hi Paul. I occasionally listen around the beacon band and there are certainly beacons to be heard. There may be a couple of reasons why you aren't hearing much: First of all, neither of the SMA ports works well at LF (especially port B, which has a very poor LF response due to the bias-T circuitry),...
by g1hbe
Mon Jul 24, 2017 7:58 am
Forum: General
Topic: Having bad AM broadcast interfernce
Replies: 8
Views: 1609

Re: Having bad AM broadcast interfernce

As you've discovered, a coaxial stub would be the length of your street! The alternatives are either a parallel tuned circuit in series with the antenna feed or a series tuned circuit across the feed. Either way you will need an inductor and a variable capacitor. The values will be roughly in the re...
by g1hbe
Sun Jul 23, 2017 9:31 am
Forum: SDRplay related
Topic: RSP2 LO 3rd harmonic spurious response only -20dBC
Replies: 17
Views: 2723

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: 2723

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: 897

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: 1609

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: 504

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: 1074

Re: interference problems

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

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