Gentlemen, suggest some alternatives to the SignalLink USB for digital. Would like to research.
David A., KC0XT > On Jun 9, 2015, at 2:10 PM, Joe Subich, W4TV <[email protected]> wrote: > > >> I think there is one point that is overlooked in a lot of these >> discussions. It really doesn't take much of a sound card to do >> digital signal processing on 3 KHz or less audio streram. > > There are a significant number of reports concerning the issues with > Signalink on-line if one bothers to look. In general they relate to > improper filtering of the USB +5V power, lack of a regulator for the > V/2 reference to the sound codec (analog to digital converter), lack > of proper bypassing of noise from the various chips, requirement that > the digital to analog converter be run at too high a level in order > for the "VOX" to trigger reliably, etc. > > In general, this means Signalink loses 15 dB or more of signal to > noise ratio (which is a big deal with modes like JT65 and JT9 on HF) > on the receive side and is much more "dirty" (often with multiple > audio signals) on transmit. > > You're correct that it does not take much of a sound card to decode > some signals. However, the Signalink "sound card" contains most of > the same components as the generic USB sound products that perform > much better - yet Signalink costs two to three times as much. > > 73, > > ... Joe, W4TV > > > On 2015-06-09 3:59 PM, Barry LaZar wrote: >> Joe, >> You bring an interesting point of view. I've been using a SignaLink >> USB for at least 3-4 years. I haven't had an issue with it except not >> enough time to play. And, I can't blame the manufacturer for that. >> >> I think there is one point that is overlooked in a lot of these >> discussions. It really doesn't take much of a sound card to do digital >> signal processing on 3 KHz or less audio streram. However, I would never >> use a card in my laptop or my I/F for some of the heavier lifting here >> in my shack where I need 96KHz sample rates or better with 24 bit >> digitizing. But for just hook it up, set the levels and go, an interface >> with a built in sound card is not a bad way to go. In many cases, it is >> just easier to do and it allows for more flexibility. >> >> 73, >> Barry >> K3NDM >> >> On 6/9/2015 3:11 PM, Joe Subich, W4TV wrote: >>> >>> On 2015-06-09 12:02 PM, Bob N3MNT wrote: >>>> OP said computer did not have an audio input. >>> >>> He's still better off with an external USB sound card of reasonable >>> quality and a pair of audio cables than using the Tigertronix product >>> of dubious quality and well documented poor design. A simple USB sound >>> card of reasonable quality will cost 1/3 to 1/2 as much as the inferior >>> "amateur" product. >>> >>> 73, >>> >>> ... Joe, W4TV >>> ______________________________________________________________ >>> Elecraft mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>> Help: http://mailman.qth.net/mmfaq.htm >>> Post: mailto:[email protected] >>> >>> This list hosted by: http://www.qsl.net >>> Please help support this email list: http://www.qsl.net/donate.html >>> Message delivered to [email protected] >>> >> >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[email protected] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to [email protected] >> > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] David Ahrendts [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
