Wide Signal s on PSK31 - Digital Forum at eHam.net

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eHam.net Forum : Digital : Wide Signal s on PSK31

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Wide Signal s on PSK31	Reply
by KG8JF on October 26, 2009	Mail this to a friend!
How does one go about informing a station that he is making sidebands? There have been several occasions where I have gone back to the station and let him know about the problem and offered my help. In every case the exchange has been amicable. In most of the cases the folks just do not know how to set up a psk signal. I confess to them that it is a daunting task and that I solved my problem with an "xjbkzam whizzy doo dad", and that now I do not have to worry about being too wide. There have also been times when I email the guy and in another email gave him my method for setting up the signal. I would just like some input from others. Has anyone else tried to deal with the issue. Please just don't let it pass. The guy will never get it right

RE: Wide Signal s on PSK31	Reply
by KG6AF on October 26, 2009	Mail this to a friend!
Why not just tell them to: 1) set their rig's RF power to maximum. 2) set the tx audio level into the rig just below the point where ALC kicks in. The only tricky thing about this is that there are several things that may contribute to the final audio level: (a) the computer's sound card settings, (b) the rig's mic level (if the tx audio is going into the rig through the mic connector), and (c) the tx audio setting on the interface, if it has one. That's about it, in most cases.

RE: Wide Signal s on PSK31	Reply
by N5YPJ on October 26, 2009	Mail this to a friend!
KG8JF great post, I wondered the same but have always been wary of offending or discouraging someone. I recently changed transceivers and following the FT-897D manual on setting PSK31 I was still throwing a sideband on K5WW's waterfall, so we just kept tweaking it down until it was just right. I've setup interfaces three times and each time got someone to monitor my signal on their end. There really are so bad sigs out there and one fellow I was chatting with one night on 40 said that with all the QRM it was necessary to run the full 100 watts! Do everyone including yourself a favor and have a ham buddy critique your PSK31 signal.

RE: Wide Signal s on PSK31	Reply
by G0GQK on October 27, 2009	Mail this to a friend!
Perhaps the source of the problem is that people decide they would like to try some digital activity, connect everything together but then failed to read anything about the correct way to transmit digimodes. How many times have we read on ham websites where people buy a new tranceiver, don't read the handbook sufficiently well and then ask a question when they have some minor dilemma ? There seem to be sufficient places to read help sheets, but if people don't consider they need this information the result is there for all to see. The problem can be easily solved in the US, everybody speaks the same language, but how do you communicate with a European national who doesn't speak English as a first language ? I do contact a station with a poor PSK transmision, the use of the language would be different in the US " Hello my dear radio friend, may I tell you dear OM, that your signal is very wide IIIIIIIII and causing QRM. Please adjust your ALC and processor, 73 " Sometimes it works, sometimes it doesn't. There was a time when many stations told an operator what a lousy signal he was transmitting and he was still at it five hours later ! G0GQK

RE: Wide Signal s on PSK31	Reply
by AA4PB on October 29, 2009	Mail this to a friend!
First off, be sure that your receiver is clean. Distortion (and poor IMD) can be caused by non-linear operation anywhere in the signal chain from the Tx sound card to the Rx sound card. Fast AGC settings can cause the Rx to distort strong signals on some receivers. If other stations of the same or stronger signal strength are narrow and only this one signal is broad then by all means tell him. I had a local report to me that my IMD was only -10dB. I started backing down the audio drive. By the time I was to about 1W output he was still reporting only -15dB. I went off the air and set up my own second receiver to check my signal. The IMD was good all the way to 75W output so the problem was obviously on his end. I've learned over the years not to get too excited from one bad signal report. If I get two reports of the same problem then its time to get serious about checking it out.

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