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: <Repeater-Builder@yahoogroups.com>
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 Repeater-Builder@yahoogroups.com, <[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
>>
>>
>>
>>
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>
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