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Interfaces for digital modes

Posted: Wed Oct 04, 2017 11:30 pm
by va3ts
A good read, it should answer everyones questions regarding interfacing your transceiver to the computer...73

http://www.wa1wa.net/filespdf/pskhandbook.pdf

Re: Interfaces for digital modes

Posted: Thu Nov 02, 2017 3:36 pm
by VE3PCP
So, I am wondering.
I have read a few online reports regarding using a Kenwood TS440 for digital.
The rig has RCA connections on the back for AFSK In and AFSK Out, Out being constant level.
I have read that the connection can be as simple as Audio out from your computer to AFSK In and from AFSK Out to your audio input on the computer.
Adjust mic gain to attain power output level, run in vox mode using LSB setting.
AFSK Out is constant level so you can use your line in level on the computer to adjust and still use the volume control on the rig to control speaker volume which has no effect on AFSK Out.

Am I over simplifying it?

Thanks in advance.
Rob, VE3PCP.

Re: Interfaces for digital modes

Posted: Thu Nov 02, 2017 5:58 pm
by va3ts
Audio in and out is usually not the issue, mic input/speaker output, adjust with mic gain and volume to suit your sound card...the issue is usually keying the rig .... but not a giant issue, for those without serial ports, get a usb to serial adapter.... follow the instructions to make a keying interface to your radio using PTT ... 73

Re: Interfaces for digital modes

Posted: Thu Nov 02, 2017 10:23 pm
by VE3PCP
Ok, thanks.
Several reported that they just used VOX but that all the levels had to be set up properly which makes sense.
I guess the only way to know for sure is download the software, done, then get some cables and give it a go!
When I downloaded the FT8 software onto my desktop, it said required audio input not found so I assume it looks for something from the receiver in the way of an audio input.
I'll be loading it on my laptop to give it a whirl in any case..

Re: Interfaces for digital modes

Posted: Sun Nov 19, 2017 5:28 pm
by VE3PCP
So I got things set up. Made 32 contacts between Friday night and Saturday.
Found out from Don, VE3IDS, that it is very important to sync the computer clock to the UTC clock. Even though I had it synced through the computer default, it was out by several seconds to the UTC clock. Once I manually synced it to the UTC clock and turned off the auto sync, the decoding improved quite a bit.
Uploaded log to eQSL and got quite a few cards back already.
Here is a short video.
Enjoy!
Rob, VE3PCP.

[BBvideo=560,315]https://youtu.be/hQt2Fda9-T4[/BBvideo]

Re: Interfaces for digital modes

Posted: Mon Nov 20, 2017 3:52 pm
by VE3PCP
52 contacts total over the weekend between 17M, 20M and 40M.
Lots of signal reports on PSK Reporter too which I found to be pretty cool.
Looks like with some history on each band they can plot a typical area where you cover on each band.

Re: Interfaces for digital modes

Posted: Tue Dec 19, 2017 2:17 pm
by VE3PCP
Since 1st contacts made on November 17th until last night, I have a total of 437 contacts using my call sign and about 360 using VA3RAC on FT8.
14 countries as VE3PCP, not sure about with VA3RAC.
Not too shabby for a noob to digital.
800 contacts total and counting..in a month plus a day.