question this probably would work since little data might be
going thru the system.
73, ron, n9ee/r
From: Nate Duehr [EMAIL PROTECTED]
Date: 2007/08/03 Fri AM 03:08:44 CDT
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Connecting Multiple TNCs
On Aug 2
On Aug 2, 2007, at 7:03 PM, Ron Wright wrote:
Nate,
Would just disabling one PTT while the other is txing mean the
disabled would think it was transmitting, but not really.
That's not what I recommended. I recommended tying one's PTT signal
to the other's RECEIVE signal so it would
* Ron Wright [EMAIL PROTECTED] [2007 Aug 03 08:48 -0500]:
Nate,
I looked in my KPC-3+ manual and they do call out a DCD line on both the
RS232 DB25 connector, pin 8, and also on the 9 pin radio connector. However,
I cannot find any reference to it in the manual. Probably there, but
Nate Bargmann wrote:
* Ron Wright [EMAIL PROTECTED] [2007 Aug 03 08:48 -0500]:
Nate,
I looked in my KPC-3+ manual and they do call out a DCD line on both the
RS232 DB25 connector, pin 8, and also on the 9 pin radio connector.
However, I cannot find any reference to it in the manual.
Eric,
I am sure you can connect the audios together from/to both rigs. One would
have to isolate the TNCs TX audio using just a couple of resistors. Their
values would depend on the rig TX audio input impedance, but typically is high
on Ham rigs so 1 kOhms resistors would probably work.
here.
73, ron, n9ee/r
From: Eric Lemmon [EMAIL PROTECTED]
Date: 2007/08/01 Wed PM 09:18:40 CDT
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] Connecting Multiple TNCs
Dave,
I'd like to see that article, too. Connecting two TNCs to one radio is
easy
I seem to recall that the trick to doing this (other than diode steering the
PTT's and isolating the audio) was to steer the PTT signal from each TNC to
the other's RF-DCD port through a diode. That way, each TNC would know when
the other had the PTT in use. This was most commonly used to mux 1200
:13 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: Re: RE: [Repeater-Builder] Connecting Multiple TNCs
Eric,
One other comment. Since connecting the receivers in parallel one must make
sure one is using squelched audio. If open squelch audio, the noise will
probably interfer with the other
Eric Lemmon wrote:
Dave,
I'd like to see that article, too. Connecting two TNCs to one radio is
easy, but allocating the RX and TX functions between two devices is hardly a
trivial matter. Unless a buffer is used to store outbound data while the
radio is busy receiving data on the other
Dave,
I'd like to see that article, too. Connecting two TNCs to one radio is
easy, but allocating the RX and TX functions between two devices is hardly a
trivial matter. Unless a buffer is used to store outbound data while the
radio is busy receiving data on the other TNC, collisions will occur
Kantronics built dual speed TNCs with a provision to prevent the problem Eric
describes. It would allow you to interface both speeds to one radio and a
parameter can be set to prevent them from both trying to transmit at the same
time.
73 - Jim W5ZIT
Eric Lemmon [EMAIL PROTECTED]
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