Posted: 6/19/2015 4:47:26 PM EDT
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Sounds like a simple question. I have a KX3 and all the proper cabling. My laptop that I want to work with has a mono microphone jack. This doesn't seem to work. I stopped at Microcenter that's right down the street and bought a C-Media based USB sound card, but it seems to be mono input as well. (To tell the truth, I couldn't remember if I wanted to buy it for this or for piIRLP or something else pi/radio related) So what's the answer on how to do SDR's I/Q input?
Next question might be even worse. Say I do get the I/Q input worked out. What's the accepted way to use it? Do you hook up headphones and transmit through the PC? |
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Yes, that I have down and HDSDR is configured to work. I guess my problem is the line in isn't stereo. So what is anyone else using for a stereo line in when the laptop/PC doesn't have one? you can use an external usb adapter without stereo it's not going to work |
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Yes, the stereo adapter is key and it seems that 192k sampling rate is needed to have the mega display. Unfortunately it's harder than hell to identify stereo USB adapters to start and almost none of them have high end sampling rates.
I swear I saw a post earlier today showing one from ebay or something. Maybe it was a facebook post. I don't know. Time to move onto something else as I see this is going to be a dead end for now. 
eta: Found it. |
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Yes, the stereo adapter is key and it seems that 192k sampling rate is needed to have the mega display. Unfortunately it's harder than hell to identify stereo USB adapters to start and almost none of them have high end sampling rates. I swear I saw a post earlier today showing one from ebay or something. Maybe it was a facebook post. I don't know. Time to move onto something else as I see this is going to be a dead end for now.
eta: Found it. That won't sample at 192k |
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Found this from last Christmas that I made.
http://www.ar15.com/forums/t_10_22/678580_The_KX3_sucks_as_a_SDR.html |
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Watching with extreme interest. Please post a "how to" when you get it to work. If you have a PC with a higher end sound card, it works fine. It's the laptop end that's difficult. You're looking at $50-100 for something that will do the really impressive screen. |
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It does 48k like my iMic. All and all it isn't that bad. You still get 20+ KHz on either side of the signal you are listening to. I have kicked around the idea of using a rPi and display to make a knock off PX3 but can't find a sound card or DAC small enough to make it worth it.
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Was just ready to post this one. Love it, solid piece of gear. |
From the Echolink discussion tonight, I hooked the $10 sound device up to the KX3 and fired up HDSDR and this is what I got. I must be doing something wrong, any ideas? I can see dots to either side that looked like CW, but I couldn't tune and hear anything through the PC speakers. And if I tune dead center I get loud screeching.
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Likely your audio jack is an I/O jack, meaning that you can both feed and receive audio.
This is what you seek to make it work. Works with both my iPad and the new laptop I just got when my old one shit the bed. http://www.kvconnection.com/product-p/km-iphone-2trs-a22.htm |
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Likely your audio jack is an I/O jack, meaning that you can both feed and receive audio. This is what you seek to make it work. Works with both my iPad and the new laptop I just got when my old one shit the bed. http://www.kvconnection.com/product-p/km-iphone-2trs-a22.htm The problem with those is they don't provide stereo input. Your KX3 has stereo data in the form of I and Q data coming out each on a channel. |
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The problem with those is they don't provide stereo input. Your KX3 has stereo data in the form of I and Q data coming out each on a channel. Quoted:
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Likely your audio jack is an I/O jack, meaning that you can both feed and receive audio. This is what you seek to make it work. Works with both my iPad and the new laptop I just got when my old one shit the bed. http://www.kvconnection.com/product-p/km-iphone-2trs-a22.htm The problem with those is they don't provide stereo input. Your KX3 has stereo data in the form of I and Q data coming out each on a channel. It works |
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It works Quoted:
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Likely your audio jack is an I/O jack, meaning that you can both feed and receive audio. This is what you seek to make it work. Works with both my iPad and the new laptop I just got when my old one shit the bed. http://www.kvconnection.com/product-p/km-iphone-2trs-a22.htm The problem with those is they don't provide stereo input. Your KX3 has stereo data in the form of I and Q data coming out each on a channel. It works It may work but it will only give you half of the spectrum. Depending on what software you use the other side is a mirror image. |
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From the Echolink discussion tonight, I hooked the $10 sound device up to the KX3 and fired up HDSDR and this is what I got. I must be doing something wrong, any ideas? I can see dots to either side that looked like CW, but I couldn't tune and hear anything through the PC speakers. And if I tune dead center I get loud screeching. https://lh3.googleusercontent.com/hGIF_DQbLONHYDq3JDan-6N-ZhAJCcVZ1vrQaoeAQYQ=w1242-h667-no Found it. Sadly it's when I plug in the elecraft supplied cat cable that those lines show up. Just plugging it into USB doesn't cause it, it's when I plug it into the radio. I'm not going to blame the cat cable itself, but rather the cheap ass USB sound card device. I can run HDSDR without cat and move around and everything works, but what's the point without CAT? Oh well. Time to move on to the next thing to play with. |
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The problem with those is they don't provide stereo input. Your KX3 has stereo data in the form of I and Q data coming out each on a channel. Quoted:
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Likely your audio jack is an I/O jack, meaning that you can both feed and receive audio. This is what you seek to make it work. Works with both my iPad and the new laptop I just got when my old one shit the bed. http://www.kvconnection.com/product-p/km-iphone-2trs-a22.htm The problem with those is they don't provide stereo input. Your KX3 has stereo data in the form of I and Q data coming out each on a channel. True, but the KX3 audio output is mono, so if you are feeding the computer directly from the audio port, it is mono. It only simulates stereo from the audio affects output. |
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True, but the KX3 audio output is mono, so if you are feeding the computer directly from the audio port, it is mono. It only simulates stereo from the audio affects output. Quoted:
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Likely your audio jack is an I/O jack, meaning that you can both feed and receive audio. This is what you seek to make it work. Works with both my iPad and the new laptop I just got when my old one shit the bed. http://www.kvconnection.com/product-p/km-iphone-2trs-a22.htm The problem with those is they don't provide stereo input. Your KX3 has stereo data in the form of I and Q data coming out each on a channel. True, but the KX3 audio output is mono, so if you are feeding the computer directly from the audio port, it is mono. It only simulates stereo from the audio affects output. We are using the audio port. If you look at the waterfall I posted you will see that it is ~40KHz wide. If you use the audio jack like you do with FLDIGI or HRD the most bandwidth you can get is the 4KHz with the filters all the way open. The port we are working with is marked RX IQ and uses a 3/32 stereo pin. You can use the IQ port and audio port together in which case your adapter would work great for the audio side. OP looking at your waterfall, did you turn RX IQ on in the menu? |
| Yes, IQ is on and if you look closely you'll see faint signals not mirroed across the center frequency. It's working, it's just unusable with the interference. Again, it was something coming from the CAT cable assembly. As soon as I unplugged it (and reset the software and KX3.....) the program is usable. You just have to manually tune around to view a different area of the spectrum. |
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I had a hell of a time getting HDSDR, my Xonar and an Hardrock RXTX work together. I swapped jacks and twiddled every setting in the software. I FINALLY got to where I could receive CW after ten or so tries.
The problem I have is that I use my PC for gaming, so every time I make changes for SDR, it wrecks my in-game comms. |