Search found 180 matches

by DanubeBCL
Mon Nov 27, 2017 9:08 am
Forum: SDR Antennas
Topic: Why you should avoid RG-58
Replies: 6
Views: 590

Re: Why you should avoid RG-58

Good shielding of the coax cable is only one small part of the story. In most cases sheat waves on the coax shielding are more evil. The only remedy against this is common mode chokes. In the vicinity of power lines the RF noise (inside and outside of houses) has a strong magnetic component. It indu...
by DanubeBCL
Sat Nov 18, 2017 12:43 pm
Forum: General
Topic: RSP RFI
Replies: 8
Views: 3557

Re: RSP RFI

Hallo Phil, although mains lines of course carry a lot of noise from the neighbouring houses into my own house they are not the problem. 1. The power lines entering my house run through strong RF filters. 2. I use intensive grounding with additional earth rods at multiple places in my antenna instal...
by DanubeBCL
Tue Nov 14, 2017 2:28 pm
Forum: New Users' experiences
Topic: HDSDR2 Waterfall screen noise with RSP2
Replies: 4
Views: 471

Re: HDSDR2 Waterfall screen noise with RSP2

OK - thanks very much. Is there a way of filtering out some of the screen noise with RSP2? That depends on how the noise comes into your receiver. Some of the countermeasures have already been mentioned. 1. Good grounding of receiver and coaxial cable shield 2. Common mode chokes at the antenna inp...
by DanubeBCL
Mon Nov 13, 2017 12:13 pm
Forum: General
Topic: Question about HDSDR and rsp1 dbfs numbers
Replies: 2
Views: 308

Re: Question about HDSDR and rsp1 dbfs numbers

https://en.wikipedia.org/wiki/DBFS In short: When a signal is 0 dB FS the ADC converter only creates logical "1"s and cannot discriminate the spectrum signals any more. It overloads. The db FS value indicates how "far" a signal is away from the highest possible value the ADC can ...
by DanubeBCL
Sat Oct 28, 2017 5:16 pm
Forum: SDRuno
Topic: SDRuno 1.2 and CSVuserlistbrowser problem
Replies: 7
Views: 406

Re: SDRuno 1.2 and CSVuserlistbrowser problem

Yes, and also VSPE is working too, of course. In my expierence I have learned to avoid COM port names like CNCB0 or something. They work in SDRunoEXTIO here, but I had problems in SDRuno 1.2 when I tried to reconstruct Henry's problem. But no worry. It's working for Henry now. But I still recommend ...
by DanubeBCL
Sat Oct 28, 2017 2:48 pm
Forum: SDRuno
Topic: SDRuno 1.2 and CSVuserlistbrowser problem
Replies: 7
Views: 406

Re: SDRuno 1.2 and CSVuserlistbrowser problem

Strange. The Return trick does not work here.
But nevertheless. Good that it is working for you.
73, Heinrich
by DanubeBCL
Sat Oct 28, 2017 2:20 pm
Forum: SDRuno
Topic: SDRuno 1.2 and CSVuserlistbrowser problem
Replies: 7
Views: 406

Re: SDRuno 1.2 and CSVuserlistbrowser problem

Hello Henry, I assume you use com0com. com0com proposes COM port names which cannot be used by some softwares. The softwares expect a denomination like COM[some number], but not random letters and numbers as com0com proposes. Go into the com0com setup and rename your CNCB0, CNCB1 to COM12, COM13 (or...
by DanubeBCL
Fri Oct 27, 2017 10:33 am
Forum: General
Topic: FSK
Replies: 3
Views: 380

Re: FSK

and they seem to have an FSK “button”, which made me wonder and I thought I should ask on this forum. The SDR softwares follow a different approach. Some keep the nominal frequency and shift the passband when digi modes are selected, others keep the passband and shift the frequency. When a software...
by DanubeBCL
Tue Oct 24, 2017 10:47 am
Forum: General
Topic: Another odd signal (or signal-like phenomenon)
Replies: 4
Views: 492

Re: Another odd signal (or signal-like phenomenon)

See for example https://en.wikipedia.org/wiki/Ionosonde
Inososonde spurs will frequently appear daily on various SW bands on your spectrum/sonogram. Normal business on SW.
73, Heinrich
by DanubeBCL
Mon Oct 23, 2017 11:43 am
Forum: General
Topic: Buzz in AM mode
Replies: 4
Views: 476

Re: Buzz in AM mode

There are often ground loops between the antenna ground and PC/audio amplifier ground. You seem to have a lot of 50 Hz and harmonics in both receivers. I think the SDR software for the RTL dongle has a highpass filter suppressing the 50 Hz part more than SDRUno. Or do you use the same SDR software f...

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