Search found 106 matches

by aurgathor
Wed Nov 13, 2019 6:46 pm
Forum: RTL-SDR Discussion
Topic: distorted FM
Replies: 13
Views: 5591

Re: distorted FM

> Have you tried adjusting the bandwidth of the filter? Yes. Makes no obvious difference. > It looks like there is some clipping of content between the main signal and those 2 digital sidebands? Umm, err, I don't think that should be the case, but what can I possibly do with that? > Have you observe...
by aurgathor
Wed Nov 13, 2019 6:25 pm
Forum: RTL-SDR Discussion
Topic: distorted FM
Replies: 13
Views: 5591

distorted FM

Currently, I'm using an RTL-SDR v3 and SDR# to listen to FM radio; however, I have occasional issues with distorted sound and I'm not sure if that's due to low signal level or something else. I tried various settings in SDR# to no avail. The dongle and the antenna are located outside. SDR# uses arou...
by aurgathor
Wed Nov 13, 2019 5:59 pm
Forum: RTL-SDR Discussion
Topic: Listening to FM broadcast with HAM IT UP
Replies: 6
Views: 2776

Re: Listening to FM broadcast with HAM IT UP

As per https://www.nooelec.com/store/ham-it-up.html : "Frequency capability of 100kHz-65MHz in upconvert mode" and the FM band is well above 65 MHz. While I haven't seem one, I bet there is a 65 MHz low pass filter on the ham-it-up's input, and that should explain why it's not working on the way you...
by aurgathor
Wed Nov 13, 2019 1:50 am
Forum: Other SDR Devices
Topic: SDRplay announces the RSPdx
Replies: 8
Views: 6304

Re: SDRplay announces the RSPdx

Why did you switch away from the Hi-Z input?
by aurgathor
Sun Nov 10, 2019 8:50 pm
Forum: RTL-SDR Discussion
Topic: Long USB-cable vs long antenna-cable?
Replies: 23
Views: 41930

Re: Long USB-cable vs long antenna-cable?

The output of the SDR is a digital signal, and that should not be affected by the relatively low level electrical noise you could find in USB hubs. Only the noise that can get to the input of the SDR (presumably mostly through the antenna) is the one that can make a significant difference. But If yo...
by aurgathor
Sat Nov 09, 2019 9:57 pm
Forum: RTL-SDR Discussion
Topic: Long USB-cable vs long antenna-cable?
Replies: 23
Views: 41930

Re: Long USB-cable vs long antenna-cable?

But you also need a Pi or something equivalent which can pretty much negates the cost advantage. I don't have a Pi, but have plenty of USB cables and hubs. I'm not trying to say that one approach is better than the others (they are all different with different pros and cons) only that it should be p...
by aurgathor
Sat Nov 09, 2019 5:13 am
Forum: RTL-SDR Discussion
Topic: Long USB-cable vs long antenna-cable?
Replies: 23
Views: 41930

Re: Long USB-cable vs long antenna-cable?

I just verified that the RTL-SDR v3 will work fine over a chain consisting of 5 USB hubs and 6 USB cables. With 15ft long cables between the various devices that could cover up to 90ft, although the total amount of cabling in mine is slightly less than 40ft at the moment. I should have at least 2 - ...
by aurgathor
Tue Jun 25, 2019 8:38 pm
Forum: Off-Topic
Topic: Theoretical radio course
Replies: 2
Views: 4000

Re: Theoretical radio course

You could start by reading: https://en.wikipedia.org/wiki/Modulation

There are quite a few books and webpages for self study material.
by aurgathor
Tue Jun 11, 2019 2:21 pm
Forum: User Projects
Topic: How to buy an SDR chip
Replies: 9
Views: 6475

Re: How to buy an SDR chip

Just use the correct search terms such as "RTL2832U, chip, for sale" ;) https://www.semiconductorstore.com/cart/pc/viewPrd.asp?idproduct=75636&utm_source=GoogleShopping&utm_medium=cpc&utm_content=Realtek&utm_campaign=RTL2832U-GR&gclid=EAIaIQobChMI3py1us_h4gIVkK_sCh1BtA1-EAQYAiABEgLg5fD_BwE https://w...
by aurgathor
Mon Jun 03, 2019 2:19 am
Forum: Other SDR Devices
Topic: Suggestions for SDR kit
Replies: 3
Views: 3902

Re: Suggestions for SDR kit

There is the Red Pitaya, but that one isn't exactly cheap either.

However, as per: https://wiki.analog.com/university/tools/pluto you should be able to program the Zynq
"normally write custom software or HDL (for the FPGA) that runs directly on the PlutoSDR"