Digital Modes

Post information or questions regarding SDRplay products here
jon
Posts: 274
Joined: Tue Jan 06, 2015 10:48 am

Digital Modes

Postby jon » Fri Feb 19, 2016 9:02 am

Andrew O'Brien has created this helpful 'getting started' guide for digital modes...

Quote from the Facebook group ....

Easy Way To Do Digital Modes with an SDRplay.
Digital modes are EASY to decode with an SDRplay RSP. Assuming you have an SDRplay with drivers installed , and it is receiving signals, here are the other steps you should take.
1. Download Virtual Audio Cable (trial version has an annoying lady yelling "TRIAL" every few seconds but paid version is very good), OR download VB-Audio which is free.
2. Download Fldigi , Multipsk, DM780, Digipan, Winwarbler or MixW . Fldigi works on Linux or Windows the rest of the aforementioned are Windows. I can't help with Apple iOS. Most folks here use Fldigi or Multipsk.
3. Install VAC or VB-AUDIO. The default install is usually set to install two virtual audio cables. You should view these as virtual version of old fashioned patch cords that you likely used with an audio cable on a sound system. A "cable" audio IN and another one carrying audio OUT. After you have done this, you can almost ignore these programs since they work mostly in the background and rarely need changing beyond the default settings.
4. Install your digital mode software . In each of these applications is a set-up or configuration area . To receive and decode digital modes you only need to be concerned with receiving signals and thus can ignore the more complicated transmit settings. In the set-up/configuration area , look for the sound card options. They are usually labelled INPUT and OUTPUT. Some label it Receive and Transmit.
5. Select the INPUT/Receive option and a drop-down list of all your sound devices is usually listed. Instead of the default soundcard in your PC or laptop, look for one called VAC or Virtual Audio Cable or VB-Audio (depending on what you installed). Usually things will work if you select VAC Input or VB-Input. Some list it as Line 1 or Line 2.
6. Now boot up your preferred software used to run the SDRplay RSP. You will need to change the audio path in this software. For example in SDR-Radio Console V2, within a VFO you click on AUDIO then PLAYBACK DEVICE. In HDSDR, click on SOUNDCARD and then RX INPUT FROM RADIO. Change this to match the setting you selected in your digital mode software.
7. You should now see the received radio signals appearing in the waterfall of the digital mode software. If they don't, trying flipping Line ONE to Line 2 in the digital mode software , it can only be one or the other. You may now be able to SEE signals but may also have lost the ability to actually hear the audio signals through your computer speakers. If that is the case, let us know here. There is an easy solution to this.
8. Now, move your SDRplay to 14070 USB or 7070 USB (USA) . In your digital mode software find the mode selector and select PSK31 , sometimes called BPSK31. Most times of the day on either 20M or 40M you will hear PSK31. Move the cursor on to the waterfall and click right on the vertical line about 31 hz wide that is slowly moving down your waterfall. You should be easily be able to decode a signal above an S1.
9. If you get this far, check back here and we will move on to further questions including decoding other modes. If you got this far and it works, the 80% of the other modes are just as easy. Then next steps are some of the nifty extra things your digital mode software can do. After ensuring you are receiving OK, we can move on to fancy tricks like automatically determining what mode your are seeing, or having the software sound an alarm upon receipt of certain key words, or automatically receiving bulletins and importing in to your web browser.

End of quote...

The above was reproduced from a posting in the facebook group https://www.facebook.com/groups/sdrplay/ which is a great place to ask detailed questions of other users doing what you are trying to do. (plus you don't have to wait for a moderator to approve your post once you become accepted as a friend in the closed and very friendly group.
Last edited by jon on Thu Jan 01, 1970 12:00 am, edited 0 times in total.
Reason: No reason

DanubeBCL
Posts: 159
Joined: Sat Jul 02, 2016 12:39 pm

Re: Digital Modes

Postby DanubeBCL » Tue Jul 19, 2016 2:03 pm

After reading another message here about fldigi referring to this post I came upon section 6
In HDSDR, click on SOUNDCARD and then RX INPUT FROM RADIO. Change this to match the setting you selected in your digital mode software.

You should not change the RX Input from Radio. This must remain your radio, of course, be it a Funcube, an RSP or whatever. You should point the RX Output to your virtual soundcard (maybe a VB-Audio, Hi-Fi Cable, a Myzuchenko VAC or whatever).

Example:
In HDSDR my RX Output goes to Hi-Fi Cable input.
In fldigi I select Hi-Fi Cable output as the capture source.

When someone follows the hint in section 6 word by word he might erroneously disable his radio completely.

73, Heinrich
Last edited by DanubeBCL on Thu Jan 01, 1970 12:00 am, edited 0 times in total.
Reason: No reason

Garry1948
Posts: 2
Joined: Tue Aug 16, 2016 7:31 pm

Re: Digital Modes

Postby Garry1948 » Tue Aug 16, 2016 7:47 pm

I'm studying the Operators manual online, but the amount of information is semi-overwhelming and the 'golden nuggets' are few and far between! :o

Step 7: You may now be able to SEE signals but may also have lost the ability to actually hear the audio signals through your computer speakers. If that is the case, let us know here. There is an easy solution to this.

I'm running Windows 10 on a Core I5 Laptop and have run into this issue. I have tried and can not get the audio of the signal working. May I please have the solution?

Does anyone have a 'fldigi script' generated for SDRPlay/Windows 7/10, so I can change the Operator configuration items and 'restore' the configuration into my freshly installed fldigi? I'm currently using SDR-Console and VAC demo SW.
I'm struggling trying to get digital modes (CW) decoded.

Thanks

Garry, WD0DUD
Last edited by Garry1948 on Thu Jan 01, 1970 12:00 am, edited 0 times in total.
Reason: No reason

DanubeBCL
Posts: 159
Joined: Sat Jul 02, 2016 12:39 pm

Re: Digital Modes

Postby DanubeBCL » Wed Aug 17, 2016 8:31 am

Hi Garry,
not sure what problem you are addressing exactly. But when using virtual soundcards for routing audio into the decoding software you must allow the PC's speaker soundcard to echo the output of the virtual soundcard.
Do a right click on the speaker symbol in the taskbar at right bottom and open Recording Devices.
Now you can see your virtual soundcard somewhere (e. g. VB-Audio something).
Open its properties and go to tab "Listen".
Select your speaker soundcard in the dropdown list (e. g. Speaker (Manufacturer...) something).
Tick the box "Listen to this device".
73s, Heinrich
Last edited by DanubeBCL on Thu Jan 01, 1970 12:00 am, edited 0 times in total.
Reason: No reason

Garry1948
Posts: 2
Joined: Tue Aug 16, 2016 7:31 pm

Re: Digital Modes

Postby Garry1948 » Wed Aug 17, 2016 9:50 pm

Thanks to all for the expert help. I have fldigi decoding CW.

Garry
Last edited by Garry1948 on Thu Jan 01, 1970 12:00 am, edited 0 times in total.
Reason: No reason


Return to “SDRplay related”

Who is online

Users browsing this forum: No registered users and 2 guests