John, I may be wrong in my assessment.
By One-Way, I was referring to rig to TNC. By 2-Way, I meant taking discriminator out of one rig to discriminator audio in of the other and vice-versa. Everything points to the audio being unconditioned, thin and aurally pure, but when you send it to the other radio, destined for rebroadcast, the receiving radio does the conditioning. I'm not sure if my choice of wording is technically correct. The results we have had in playing around with the data ports were not what we expected. The term "Conditioning" was the best I could come up with for the transition of discriminator output of the Transmitting rig being injected to the discriminator of the Receiving rig and the final result coming through the speaker. I once heard that the "best" preamp in the esoteric audio world would be a straight piece of wire; with gain. However, in the real world, every audio device does some "conditioning" to make the output pleasing to the ear. This practice probably goes back to the Fletcher-Munsen curves, which were the result of early pioneering in the Bell System to determine the best response curve for telephone headsets. Their results have been used on many ways to augment the human listening trait. OTOH, the discriminator has always seemed to be the best point to tap to get audio that is not "colored" in any way so as to be the best choice for analog input data transfer. I think Ken's reply summed it up in far less words. David KD4NUE ----- Original Message ----- From: "WD7F - John in Tucson" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Saturday, December 17, 2005 12:21 PM Subject: Re: [Repeater-Builder] Re: DR-235 for repeater > David, what do you mean by: > > "On a one-way setup, you definitely get discriminator output. When > coupled > to the second rig, the conditioning takes place."? > > Which output are you talking about? I guess my question is: Other than > the > specified signal levels, what IS the difference between the 1200 baud > audio > out and the 9600 baud audio out? > > de WD7F > John in Tucson > > > ----- Original Message ----- > From: <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Saturday, December 17, 2005 9:57 AM > Subject: Re: [Repeater-Builder] Re: DR-235 for repeater > > > I also had the same concerns. > > However, I found that the treatment after the discriminator on the > respective radios applied the "conditioning" to make the interface > transparent to the ear. > > We have tested "in-band" range extenders using antenna separation to > extend > the range of simplex communications by using a pair of 2 meter rigs > connected data port to data port. I have also done similar "experiments" > going from 6M SSB to 2m Simplex and back. > > The audio quality does not have the "thin" quality you would expect; > reinforcing the concept that the radio does the conditioning "after" the > discriminator to the user interface (speaker and audio controls on the > receiver). > > It took me a long time to finally accept that this was the case before > even > trying to use the data ports for user audio. > > On a one-way setup, you definitely get discriminator output. When coupled > to the second rig, the conditioning takes place. > > David > KD4NUE > > ----- Original Message ----- > From: "Bob Witte K0NR" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Saturday, December 17, 2005 11:05 AM > Subject: [Repeater-Builder] Re: DR-235 for repeater > > >> With regard to interfacing radios via "packet data" ports. >> Has anyone looked at the audio flatness of these ports? >> Also, some rigs have a 1200 baud in/out and a 9600 baud >> in/out, which (apparently) have very different audio levels. >> I suspect there are other characteristics that are different, too. >> >> 73, Bob K0NR >> >> --- In [email protected], <[EMAIL PROTECTED]> wrote: >>> >>> Andy, >>> >>> I have not personally done this, but the data out connector should >>> suply pins for audio in , audio out, Squelch voltage or logic >>> and a reference ground. These signals should provide everything >>> you should need for direct linking of 2 radios. The DB9 is easy >>> to work with. >>> >>> Since these were designed for packet use, the audio is not >>> affected by front panel controls. It is conditioned and altered >>> after it enters the TNC; or >>> in this case, the other rig. >>> >>> I have set up crossband repeaters using data connectors from other >>> brands, and it works well with little external manipulation. >>> >>> Attached is the page from the manual describing pin function for >>> the DB9 connector. Email me if it doesn't go through. >>> >>> David >>> KD4NUE >>> >>> >>> >>> >> >> >> >> >> >> >> >> >> Yahoo! Groups Links >> >> >> >> >> >> > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > > > > > Yahoo! Groups Links > > > > > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> 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/
