Search found 106 matches

by hotpaw2
Sat Apr 28, 2018 7:45 pm
Forum: Other SDR Devices
Topic: Airspy HF+ on a Raspberry Pi?
Replies: 4
Views: 5679

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: 6126

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: 4396

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: 2007

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: 9423

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: 2363

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...
by hotpaw2
Fri Mar 09, 2018 4:10 am
Forum: User Projects
Topic: New SDR app for iOS (iPhone)
Replies: 5
Views: 9423

New SDR app for iOS (iPhone)

Hi. A first version of my iOS SDR app is nearing completion. So I'm interested finding a few users who would like to beta test a pre-release of the app, and provide some feedback. The beta test requirements are having a 64-bit iOS device (iPhone or iPad) running iOS 11.2.x or newer, having Apple's T...
by hotpaw2
Tue Mar 06, 2018 6:33 pm
Forum: RTL-SDR Discussion
Topic: R820T2 out-of-production?
Replies: 1
Views: 1838

R820T2 out-of-production?

Are R820T2 tuner chips by Rafael Micro no longer in production? If so, when they run out, how long will it take vendors to redesign RTL-SDR PCBs and librtlsdr code for a newer or replacement front-end tuner chip?
by hotpaw2
Tue Mar 06, 2018 6:28 pm
Forum: RTL-SDR Discussion
Topic: MTBF - Mean Time Between Failure
Replies: 2
Views: 1881

Re: MTBF - Mean Time Between Failure

A good MTBF calculation would require a very large statistically significant sample set.

My tiny insignificantly small sample set was, out of 4 RTL sticks, one died that was only a couple months old. Some of the others are over a year old.
by hotpaw2
Sun Feb 25, 2018 7:29 pm
Forum: Other SDR Devices
Topic: SDR to locate cochlear implants
Replies: 4
Views: 4223

Re: SDR to locate cochlear implants

You can't sniff for iBeacons with arbitrary identifiers with an iOS device, but there are reportedly apps for Android mobile phones (perhaps you can borrow one) that will allow one to search for any advertising iBeacon using any identifier. The 2.4 GHz ISM band that BLE uses is too high for generic ...