glSDR
For information of glSDR and the servers, use the About menu.
The first client that connects to a server is in master mode, and has control over the vfo and other controls so that it can tune and change bands and frequency etc. Subsequent client connections will be put in slave mode where the slave clients can only listen to the audio and watch the spectrum and waterfall in passive mode. When the master disconnects, the next slave in line will become the new master. When there are many simultaneous clients, the network bandwidth may be exceeded and some slaves will not have audio. You can see the master/slave status of your connection in the Title bar.
There is automatic Rx IQ Correction that you can enable/disable via the DSP tab. Note that you should enable Rx IQ Correction only for servers connected to IQ based SDR hardware (eg Softrock, UHFSDR), but NOT for direct sampling hardware (eg Perseus).
It has better display for high bandwidth servers. These servers have sampling rates of 480 ksps or more thus the spectrum/waterfall displays a wide bandwidth.
Minimum of Ver 8 is needed for new versions of servers with a revamped Local Oscillator Offset mechanism.
Ver 9 has spectrum/waterfall zoom feature. Use pinch motion to zoom/unzoom. I have found it easier to put one finger in a fixed position, and then zoom/unzoom by moving the other finger.
Ver 10 has improved drag tuning taking into account the zoom factor.
Ver 11 has been tweaked for backward compatibility with Android 2.2 devices.
Ver 12 has Spectrum Averaging options and also one FMN filter at 80khz for listening to Wide Band FM Broadcasts.
Ver 13 has more Spectrum Averaging levels.
glSDR has TRANSMIT capability in voice modes, ie SSB, AM, NBFM etc. However, you need to supply the User and Password to enable transmit when connecting to a password protected server (ie ALL the public online servers). Also, it requires that your device is capable of MIC input at 8khz sampling rate. DO NOT install this version if your device is not compatible !!!
Version 25 has FILTER MENU updated swhen MODE changes. The zoom action is also magnified when unzoomed or at low zoom so that you can zoom "faster" initially.
Version 26 has been tweaked to support Adreno GPU based devices by working around some issues with 24 bit color transparent overlay surfaces in Adreno driver.
Version 27 has the waterfall initialized correctly.
Version 28 has bugfix for band specific frequency after changing from a slave connection to a master connection.
Version 29 has a customized View of the FILTER MENU to indicated the currently selected Filter.
Version 30 has a customized View of the SERVER MENU to indicated the currently selected Server.
Version 31 has an easier to understand error message when a Server is unavailable.
Version 33 has a MASTER menu button that can take over a server as the master connection, provided you have the User/Password set for the server. The User/Password is usually known only to the server owner.
Version 35 has minor bug fixes and a new MENU option for the arrow keys.
Version 36 fixes the bug when a blank Frequency is entered.
Version 38 has a MENU item for users to donate bitcoins to the project.
Version 39 has a DSP checkbox for RX DC Block. This eliminates or reduces the central spike in some radios from differential in the DC potential of the I and Q channels.
Version 40 has a "Donate Bitcoin" menu item for you to support this project. The bitcoins donated will go towards improving the number and quality of the backend servers and service quality.
Version 41 has improved stability to prevent crashes on fast rotation of screen orientation.
Category : Education
Reviews (25)
I only have two issues that I hope are fixed to make this 5 stars. 1. I either have not figured it out or the app is not capable of tuning in finer increments. It makes tuning in of SSB signals very hard and in many cases almost impossible. 2. The waterfall display is shifted and does not match this spectral display. Other than that I have enjoyed it. Even tuning in plain old broadcast stations when conditions are bad.
Having used this app for many years without major problems, after a recent upgrade it has become very unreliable. It tends to freeze after a few seconds of operation or when the screen is touched. The app often remains frozen until it is manually unlocked. The same problem is encountered on two different tablets. Please look into this fault as your app is unique and widely used among the amateur community. 73's G3PSR
Used to work very well, now all I get is Java errors and a corrupted display. Update: it's been about a half year and this app still does not function, guessing the developer no longer supports it. Prove me wrong, this app used to be awesome! :-(
It used to work properly but after the recent upgrade app keeps crashing. Please fix. (from sony xperia z5 compact)
This seems to be a fantastic radio app but I discovered it has connection issues and freezes everytime I use it. It may work for a few moments but always results in freezing up or saying it can't connect to the server. I'm using a solid cable internet connection via my home router so that's not the issue, and the phone a is a two-month old Samsung Note-3 with way more than enough processor power and RAM (2.3 GHz quad-core cpu with 3 gigabytes of RAM). Just won't work properly so I had to delete it :(
Application halts with a java "NumberFormatException" error each and every time a new server connection is made.
Does not work. Even if I choose a working server, it crashes after a few seconds. Always throws a "java lang number format exception for input string" followed by a white question mark on black background at me.
I used to really love this app, what happened? Just refuses to work now, too many java errors and can't even get into the servers list.. can you please fix this.. I'm really disappointed this app went this way..
The app opens and shuts down in 2 seconds. It doesn't like my new motor G4. Help !
I used this before and it worked fine. Now it keeps crashing.
Absolutely useless , Freezes and locks up constantly.. uninstalling.
WHAT IS THAT MICROFINT RED KINE SAU, CANT ZOOM ON A DIWN SEREVERM MESSAGE! u need to be in the notification bar while background running - AND STARTING ANOTHER SERVER ADDS THAT AUDIO, DOESNT KILL PREVIOUS SERVER, handy so keep that as a feature, BUT, Exit doesnt kill your app!!! SERVER NOT FOUND: can u make it autofind another server?
Very difficult to get conversations, if at all.
Does not work. Constantly shows me java exceptions.
Very fun operating people's radios remotely!! thank you to the creator!
I wasn't able to get it to connect at all.
Gives a whole new life to Ham radio.
It didn't work. It freezes up.
Not working...doesn't show any servers
It bugs out and doesn't connect to servers anymore
No servers available. This used to be a good app. What happened? Uninstalled.
How about some US servers?
I came upon this app while looking for different tools to use with my RTL dongle. I've always been a listener of international shortwave, and decided to give it a try. Very nice RX. The server list could give a little more info, but you do have a number of choices from people offering their sdr's free to use. The interface is great, but could be better by allowing the tune control to be dragged in addition to the spectrum. Manual options are quite good. I'd like to see the next version of this app with built-in Digi modes decoding/encoding...psk, wefax, etc. Great app with tons of potential! 😀
Nice software. Can you possibly provide the contact details of the server hosts to gain access to the TX facility. Thanks MM0LID
Doesn't work now! unknown tag reference, no servers, nothing works.