Search found 40 matches

by Ben321
Tue Jul 06, 2021 3:29 am
Forum: RTL-SDR Discussion
Topic: My RTL SDR has some frequency ranges it behaves strangely in
Replies: 1
Views: 2167

My RTL SDR has some frequency ranges it behaves strangely in

Just below 860MHz LO frequency, my RTL-SDR has some strange behavior. Note that I'm using the dongle with the E4000 tuner IC (which has offset tuning mode for avoiding that strong constant spike in the middle of the spectrum). The behavior near 860MHz is that I see multiple copies of the same signal...
by Ben321
Fri Jul 02, 2021 11:43 am
Forum: Other SDR Devices
Topic: how good is Luowave's "USRP LW 1"?
Replies: 5
Views: 6558

Re: how good is Luowave's "USRP LW 1"?

For over $200 (USD) less, you can get a direct sampling SDR with slightly higher 76 MHz sample rate 12-bit ADC, and a much faster Gigabit ethernet connection. It's the Hermes Lite 2. Several hundred built. I have a couple. Component quality from Makerfabs seems excellent. If you want more bits for ...
by Ben321
Fri Jul 02, 2021 11:37 am
Forum: RTL-SDR Discussion
Topic: Directed RF at our Office Causes Headaches
Replies: 33
Views: 12104

Re: Directed RF at our Office Causes Headaches

Hi Guys, Could anybody explain where the RF energy in below graph might be originating from? It was measured with a Narda RadMan 2 XT which is a broad banded device. It seems to be a directed RF signal towards our office and it is likely the culprit causing employees of our company to have strong h...
by Ben321
Sun Jun 27, 2021 7:58 pm
Forum: RTL-SDR Discussion
Topic: Directed RF at our Office Causes Headaches
Replies: 33
Views: 12104

Re: Directed RF at our Office Causes Headaches

It looks very like FM broadcasting stations on OIRT FM band (65.9...74 MHz). Such FM band is used in Brazil and Eastern Europe. It was used in USSR as the main FM broadcasting band. That doesn't look like FM in that screenshot he showed though. FM stations don't pulse like that. Notice his peak str...
by Ben321
Sun Jun 27, 2021 7:49 pm
Forum: RTL-SDR Discussion
Topic: Directed RF at our Office Causes Headaches
Replies: 33
Views: 12104

Re: Directed RF at our Office Causes Headaches

Hi Guys, Could anybody explain where the RF energy in below graph might be originating from? It was measured with a Narda RadMan 2 XT which is a broad banded device. It seems to be a directed RF signal towards our office and it is likely the culprit causing employees of our company to have strong h...
by Ben321
Sun Jun 27, 2021 7:15 pm
Forum: RTL-SDR Discussion
Topic: What's the best way to isolate my RTL SDR from electronic interference?
Replies: 1
Views: 2696

What's the best way to isolate my RTL SDR from electronic interference?

I was listening in the FM broadcast band and noticed a whole bunch of very closely spaced spikes in the spectrum, that were clearly not any signal that should be there. I turned off my computer monitor, and that shut off the interfering signal. Interestingly, it's not a CRT monitor. It's an LCD moni...
by Ben321
Wed Feb 03, 2021 7:28 am
Forum: Other SDR Devices
Topic: how good is Luowave's "USRP LW 1"?
Replies: 5
Views: 6558

how good is Luowave's "USRP LW 1"?

It's a clone of the original Ettus "USRP 1" (which is now no longer made by Ettus). You can buy one here https://www.aliexpress.com/i/32995702637.html it appears to have the same specs as the official USRP 1, at least going by the documentation I can find on it. Of course, there's also a matter of t...
by Ben321
Sun Jan 12, 2020 8:42 am
Forum: Other SDR Devices
Topic: Please help me use HackRF One with hackrf_tools in Windows
Replies: 0
Views: 6505

Please help me use HackRF One with hackrf_tools in Windows

I've got my HackRF to receive in Windows with both HDSDR and SDR#. Now it's time to go the next step, to transmit. However, neither of HDSDR nor SDR# allow transmitting. To the best of my knowledge, there is only one Windows software that transmits with HackRF, and that's hackrf_transfer from the se...
by Ben321
Fri Jan 03, 2020 5:18 am
Forum: User Projects
Topic: I need some advice in creating IQ processing software
Replies: 6
Views: 7392

Re: I need some advice in creating IQ processing software

there are many libraries (other than FFTW) available for Android, iOS, macOS, and Linux (etc.). Some with source code, so you can compile the FFT into your app. Any good ones for Windows (I don't use Mac, Linux, or Android for signal processing), that don't come with the restrictive GPL license? An...
by Ben321
Fri Aug 09, 2019 5:01 am
Forum: Other SDR Devices
Topic: Any good full-duplex SDRs?
Replies: 8
Views: 10862

Re: Any good full-duplex SDRs?

Are you wanting to use it for ham radio? Or experiments? The ones I listed are mostly for experiments. There are many ham radio SDRs that allow full duplex, but of course you pay the ham radio price for a fully developed commercial product. I'm just looking for an easy to use RX/TX full duplex SDR.