Search found 73 matches

by hotpaw2
Tue Apr 23, 2019 4:12 pm
Forum: RTL-SDR Discussion
Topic: WFM Squelch
Replies: 2
Views: 156

Re: WFM Squelch

The signal bandwidth and subcarriers (for stereo, data, etc.) in WFM broadcasts interfere with the typical capture algorithms/filters used for NFM squelch. Those same capture algorithms work extremely poorly for AM.
by hotpaw2
Tue Apr 16, 2019 6:11 pm
Forum: RTL-SDR Discussion
Topic: Use demodulated signals with electronics, off-pc
Replies: 5
Views: 259

Re: Use demodulated signals with electronics, off-pc

Depends what you mean by a PC. I plug my RTL-SDR directly into a Raspberry Pi 3 B. A Raspberry has enough USB bandwidth and enough processing speed to demodulate the raw IQ data from an RTL-SDR, and to detect many types of signals. A Raspberry Pi also has digital IO pins, similar to an Arduino, to c...
by hotpaw2
Mon Apr 08, 2019 12:18 am
Forum: Other SDR Devices
Topic: List of HF SDR Transceivers
Replies: 5
Views: 359

Re: List of HF SDR Transceivers

Also:

LimeSDR Mini

Raspberry Pi with an RTL-SDR (direct-sampling or with an upconverter) plus a narrow-band HF filter such as the TAPR 20M TX shield for use with PiTX.
by hotpaw2
Thu Apr 04, 2019 3:36 pm
Forum: RTL-SDR Discussion
Topic: Install drivers RTL-SDR on MAC HIg Sierra
Replies: 10
Views: 485

Re: Install drivers RTL-SDR on MAC HIg Sierra

Never heard of "Touctone", but there are lots of "drivers" (actually libraries) for RTL devices that run on macOS. If you don't want to compile your own librtlsdr library using Xcode tools, you can use the ones built into Gqrx, or these pre-built ones for macOS from a UC Berkeley DSP course site: ht...
by hotpaw2
Thu Apr 04, 2019 3:29 pm
Forum: RTL-SDR Discussion
Topic: Do I have latest linux driver?
Replies: 3
Views: 329

Re: Do I have latest linux driver?

There may be no "best" server, as different forks and different servers have different improvements, some too new or experimental to make it into the Osmocom branch. However, the Osmocom branch is probably the best for general new users.
by hotpaw2
Tue Apr 02, 2019 4:55 pm
Forum: RTL-SDR Discussion
Topic: quick question about RTL SDR dongle
Replies: 5
Views: 358

Re: quick question about RTL SDR dongle

The bandwidth of an RTL-SDR is far too narrow to allow listening on two widely separated frequency bands. However your server might have enough USB ports to allow plugging in 2 RTL-SDRs, each tuned to a different band, one for 1090, the other for airband, etc.
by hotpaw2
Tue Apr 02, 2019 4:44 pm
Forum: RTL-SDR Discussion
Topic: RTL-SDR Samplerate
Replies: 2
Views: 276

Re: RTL-SDR Samplerate

An RTL-SDR outputs 8-bit IQ components, which, at 2 components per sample, adds up to 16 bits per IQ sample. The lowest sample rate the RTL2832U supports for USB data is 240ksps. To stay under 1 a megabit network cap would require a sample rate of under 1M/16, or 62.5k samples per second (or 0.0625 ...
by hotpaw2
Tue Mar 26, 2019 7:43 pm
Forum: Antennas
Topic: Multi-purpose Dipole loose pivots?
Replies: 1
Views: 265

Multi-purpose Dipole loose pivots?

The two longer antennas on my RTL-SDR Blog Multipurpose Dipole Antenna Kit just flop over to the side.
Can the antenna pivot points be tightened up?
If so, what kind of screwdriver (Phillips, Torx, hex, size?) should be used to tighten them?
by hotpaw2
Wed Mar 13, 2019 8:29 pm
Forum: User Projects
Topic: New SDR app for iOS (iPhone)
Replies: 5
Views: 6935

Re: New SDR app for iOS (iPhone)

An update to my rtl_tcp SDR app for iOS (iPhone) should now be in Apple's App store. https://itunes.apple.com/us/app/rtl-tcp-sdr/id1351164646?ls=1&mt=8 The rtl_tcp SDR version 1.0.7 update includes: - support for the SDRPlay rsp_tcp 16-bit mode for a better signal-to-noise ratio - a much improved co...
by hotpaw2
Tue Mar 12, 2019 5:40 pm
Forum: RTL-SDR Discussion
Topic: FM Radio reception
Replies: 7
Views: 8380

Re: FM Radio reception

The issue is likely the antenna size, orientation, and location in your dwelling. I can make some FM stations disappear just by turning the antenna on my RTL-SDR sideways. Even with more expensive rtl_tcp work-alike SDRs, such as the Airspy HF+ or SDRPlay 2.