If your relay takes 100 msec to switch then you need to replace it, it's way too slow by over a magnitude.
I was not talking about the sampling rate, but the gains of the amplifiers in the card, switching the audio out from the speaker to the line out, and switching from line input to microphone input. If all of that takes too long you will end up with artifacts in the audio going to the transmitter or excessive delays in switching, a condition not desired. The Delta 44 solves the problem by having separate ports for the microphone and Radio IQ input each with their optimum gain set so you don't have to go around changing anything on the sound card. Other cards like the Santa Cruz are fast but only 16 bit's and that cuts down your dynamic range. I'm not saying it can't be overcome, but those are issues that have to be dealt with, and the easiest way to do it is with a 4x4 sound card or two sound cards. Sound cards were not designed to be re-configured very often so they have skimped in that area, after all a typical use is to set it a certain way and it remains that way. All these issues are not important in a receiver but have to be considered in a transceiver. At 07:23 AM 11/8/2005, you wrote: >KD5NWA wrote: > > Not an expert on the issue, but I've seen comments about the "fact" > > that many audio cards are very slow at changing gain, and input/output > > ports. > > > From my experience a normal sound card can change sampling rate in a time >of the order of 100 msec or even less. Not sure what you mean with >changing I/O ports... if you use e.g. the Audiophile 192, which has >a dynamic range 8 dB better than the Delta 44 (but just 2 input and 2 >output channels) there is nothing to change (it doesn't have a mic input, >similarly to the Delta 44). >In any case, the time needed to change the working parameters of a sound >card is comparable to the switching time of an antenna change-over relay, >so, IMHO, this is a moot issue. > >73 Alberto I2PHD > > > > > >Yahoo! Groups Links > > > > > > > > >-- >No virus found in this incoming message. >Checked by AVG Free Edition. >Version: 7.1.362 / Virus Database: 267.12.8/162 - Release Date: 11/5/2005 Cecil Bayona KD5NWA www.qrpradio.com I fail to see why doing the same thing over and over and getting the same results every time is insanity: I've almost proved it isn't; only a few more tests now and I'm sure results will differ this time ... ------------------------ Yahoo! Groups Sponsor --------------------~--> Get fast access to your favorite Yahoo! Groups. Make Yahoo! your home page http://us.click.yahoo.com/dpRU5A/wUILAA/yQLSAA/ELTolB/TM --------------------------------------------------------------------~-> Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/soft_radio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
