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PA2AGA > HDDIG 09.07.00 18:42l 179 Lines 6524 Bytes #-9404 (0) @ EU
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Subj: HamDigitalDigest 2000/184A
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To : HDDIG@EU
Date: Sun, 09 Jul 00 14:14:27 MET
Message-Id: <hd_2000_184A>
From: pa2aga@pe1mvx.ampr.org
To: hd_broadcast@pa2aga.ampr.org
X-BBS-Msg-Type: B
Ham-Digital Digest Sun, 9 Jul 2000 Volume 2000 : Issue 184
Today's Topics:
2 TNC's with one radio (2 msgs)
An enormous opportunity!
APRS Software (3 msgs)
Forget HF & CW - Think Digital (4 msgs)
pk232 command set
Simultaneous multimode RX
Warning! -- SONY SUBSTANDARD SERVICE
Warning! -- SONY SUBSTANDARD SERVICE!
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We trust that readers are intelligent enough to realize that all text
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Loop-Detect: Ham-Digital:2000/184
----------------------------------------------------------------------
Date: Sat, 8 Jul 2000 08:40:49 GMT
From: nomail@rob.knoware.nl (Rob Janssen)
Subject: 2 TNC's with one radio
Hank Oredson <horedson@att.net> wrote:
>> A proper job requires some extra circuitry to cross-connect the DCD and
>> RTS signals internally between the TNCs, so each TNC does not transmit when
>> the other is already transmitting, or when the other has DCD on.
>> Rob
>Of course, if there is a probability this might happen.
>In the case of KG7LX, there is very little probability that there
>will be two connections at the same time ... so the simple setup
>works ok, and avoids the problem of modifying the TNCs.
This sort of fixes the problem of transmitting at the same time, but
there still is the problem that 9k6 TNCs usually don't see (or only
erratically see) 1k2 transmissions. So they will step right on top
of them.
For well-performing dual-speed operation on a single channel, everyone
needs to use DCD circuitry that detects any transmission. So no "state
machine DCD", "XR2206 dcd", "9k6 modem DCD" etc.
Best is a simple high-frequency detector at the direct discriminator output
(i.e. a standard FM squelch).
Of course the disadvantage of such a DCD is that it is sensitive to weak
spurious carriers on or near the channel.
>So for trying this out, just hook the wires together and give a try.
>The solution Rob suggests can also be done in the node software.
A decent node uses SCC cards, and the SCC driver I wrote years ago for NET
(and got cloned in many other programs and systems) has a facility to
interlock ports both for transmit and for DCD.
With TNCs this is not really possible, except with 6PACK.
Rob
--
+----------------------------------+--------------------------------------+
| Rob Janssen pe1chl@amsat.org | WWW: http://www.knoware.nl/users/rob |
| AMPRnet: rob@pe1chl.ampr.org | AX.25 BBS: PE1CHL@PI8WNO.#UTR.NLD.EU |
+----------------------------------+--------------------------------------+
------------------------------
Date: Sat, 08 Jul 2000 20:34:43 GMT
From: "D. Stussy" <kd6lvw@bde-arc.ampr.org>
Subject: 2 TNC's with one radio
As an alternative to a shared 1200/9600 baud channel with 2 TNC's, why not get
a Kantronics KPC-9612? It comes with a special setting to have both data
ports
share the same radio.
[Of course, this is applicable if one wa asking the question BEFORE acquiring
the equipment.....]
On Sat, 8 Jul 2000, Rob Janssen wrote:
> Hank Oredson <horedson@att.net> wrote:
> >> A proper job requires some extra circuitry to cross-connect the DCD and
> >> RTS signals internally between the TNCs, so each TNC does not transmit
when
> >> the other is already transmitting, or when the other has DCD on.
>
> >Of course, if there is a probability this might happen.
>
> >In the case of KG7LX, there is very little probability that there
> >will be two connections at the same time ... so the simple setup
> >works ok, and avoids the problem of modifying the TNCs.
>
> This sort of fixes the problem of transmitting at the same time, but
> there still is the problem that 9k6 TNCs usually don't see (or only
> erratically see) 1k2 transmissions. So they will step right on top
> of them.
>
> For well-performing dual-speed operation on a single channel, everyone
> needs to use DCD circuitry that detects any transmission. So no "state
> machine DCD", "XR2206 dcd", "9k6 modem DCD" etc.
> Best is a simple high-frequency detector at the direct discriminator output
> (i.e. a standard FM squelch).
>
> Of course the disadvantage of such a DCD is that it is sensitive to weak
> spurious carriers on or near the channel.
>
> >So for trying this out, just hook the wires together and give a try.
>
> >The solution Rob suggests can also be done in the node software.
>
> A decent node uses SCC cards, and the SCC driver I wrote years ago for NET
> (and got cloned in many other programs and systems) has a facility to
> interlock ports both for transmit and for DCD.
>
> With TNCs this is not really possible, except with 6PACK.
------------------------------
Date: 9 Jul 2000 01:47:28 GMT
From: tvwalarkxq@ljruffcaw.net
Subject: An enormous opportunity!
remove: <35332728.5@news.tm.net.my>
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------------------------------
Date: 09 Jul 2000 01:10:12 GMT
From: johnl84238@aol.com (JOHNL84238)
Subject: APRS Software
I am thinking about playing with APRS....I have the radio and TNC but need to
get the software. Can anyone tell me first where I can get the APRS software
for
Windows95......and can you tell me how big the APRS program is (bytes) that
has
to be loaded on my PC.....I want to load it on a laptop which does not have a
modem....so I need to do it using floppies to transfer from another PC....I am
wondering if that is possible depending on the program size. Thanks for the
help.
73,John
------------------------------
Date: 9 Jul 2000 02:04:27 GMT
To be continued in digest: hd_2000_184B
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