Search found 100 matches

by hotpaw2
Thu May 17, 2018 3:01 pm
Forum: RTL-SDR Discussion
Topic: Q branch
Replies: 3
Views: 2104

Re: Q branch

If using rtl_tcp, you can send a 5 byte command sequence to the open tcp/ip port, with 9 in the first byte, and zeros in the following 4 bytes to disable Q-branch direct sampling.
by hotpaw2
Wed May 16, 2018 4:25 pm
Forum: Other SDR Devices
Topic: SDRplay to announce a new product at Hamvention
Replies: 6
Views: 16122

Re: SDRplay to announce a new product at Hamvention

The issue I have with SDRPlay is that I heard from other software developers that their device library either doesn't link or doesn't connect to the device on one or more recent versions of macOS or the latest Raspberry Pi OS release. Have they fixed this so that SDR software developers can write ap...
by hotpaw2
Tue May 01, 2018 4:44 pm
Forum: User Projects
Topic: New SDR app for iOS (iPhone)
Replies: 5
Views: 8739

Re: New SDR app for iOS (iPhone)

Forgot to mention, my rtl_tcp SDR iOS app supports LSB and USB on HF (via Direct Sampling or an upconverter), and it also includes a CW audio filter.
by hotpaw2
Mon Apr 30, 2018 3:40 pm
Forum: User Projects
Topic: New SDR app for iOS (iPhone)
Replies: 5
Views: 8739

Re: New SDR app for iOS (iPhone)

Beta testing was successful, and the HotPaw rtl_tcp SDR app is now available from Apple's iOS App Store.

See: https://itunes.apple.com/us/app/rtl-tcp ... ?ls=1&mt=8
by hotpaw2
Sat Apr 28, 2018 7:45 pm
Forum: Other SDR Devices
Topic: Airspy HF+ on a Raspberry Pi?
Replies: 4
Views: 5489

Re: Airspy HF+ on a Raspberry Pi?

My iOS rtl_tcp SDR app is for now available for purchase from Apple's iOS App store: https://itunes.apple.com/us/app/rtl-tcp-sdr/id1351164646?ls=1&mt=8 It supports the HF+ from a Raspberry Pi to an iOS device (but only if you are willing to compile beta-test-level open source code: https://gist.gith...
by hotpaw2
Sat Apr 14, 2018 3:25 pm
Forum: Other SDR Devices
Topic: Airspy HF+
Replies: 7
Views: 5906

Re: Airspy HF+

An Airspy HF+ has a ton more dynamic range than an RTL-SDR, so doesn't need a much control over HF gain and attenuation to catch weak signals. Although an RF band-pass filter and/or broadcast band-stop filter will help almost any radio receiver. Also, I found that libairspyhf provides all the contro...
by hotpaw2
Sat Mar 31, 2018 8:58 pm
Forum: Signal Identification Help
Topic: Huge Noise!
Replies: 5
Views: 4206

Re: Huge Noise!

What SDR hardware are you using? If you are using an RTL-SDR, are you using AGC? Or perhaps you have the manual gain turned up too high?
by hotpaw2
Sat Mar 31, 2018 8:56 pm
Forum: RTL-SDR Discussion
Topic: question about how bandwidth is displayed
Replies: 2
Views: 1897

Re: question about how bandwidth is displayed

The visible bandwidth will depend on the particular SDR software visualizer you are using. Some show you the full sample rate bandwidth (or half sample rate for baseband ADCs), some show less. The useful bandwidth will depend on the phase accuracy and filter transition of the SDR hardware. Which may...
by hotpaw2
Mon Mar 26, 2018 4:11 pm
Forum: User Projects
Topic: New SDR app for iOS (iPhone)
Replies: 5
Views: 8739

Re: New SDR app for iOS (iPhone)

If you meet the iOS app testing requirements mentioned in the first paragraph, please send the email address you want associated with Apple's TestFlight program to the email address found on the hotpaw website (e.g. don't post it here). Beta-test copies of the iOS SDR app have already been sent out,...
by hotpaw2
Sun Mar 25, 2018 4:00 pm
Forum: RTL-SDR Discussion
Topic: starter guides/primers?
Replies: 3
Views: 2227

Re: starter guides/primers?

Better starter guides are needed not just for beginners, but for all users. I have an engineering degree and an amateur radio license, and I still found a lot of the SDR software documentation and tutorials very confusing at first. Worse yet, I need to write some basic SDR user documentation, and ca...