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PA2AGA > HDDIG 26.03.00 06:35l 202 Lines 6349 Bytes #-9534 (0) @ EU
BID : HD_2000_84D
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Subj: HamDigitalDigest 2000/84D
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Message-Id: <hd_2000_84D>
From: pa2aga
To: hd_broadcast@pa2aga
Subject: HamDigitalDigest 2000/84D
X-BBS-Msg-Type: B
When you only want to support incoming connections, there is no worry at
all with the extended sequencing, because negotiation is completely
automatic and initiated by the transmission of SABME instead of SABM.
Only when you want to make an outgoing connection, you need to consider
if you want to send SABME and risking confusion at the other end.
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: Fri, 24 Mar 2000 05:39:35 GMT
From: "George T. Baker" <w5yr@att.net>
Subject: PSK INTERFACE FOR FT-900
A single 2N2222 should function adequately as the switch for your PTT
line. Connect the RTS line from the serial port through a 1K or so
resistor to the base. Ground the emitter and connect the collector to the
PTT line. When the RTS line goes from about -10 volts to +10, the
transistor will be turned on and the PTT line will be grounded through
the collector/emitter circuit. A current of 15 ma can be easily handled
as can the 13.5 volts open-circuit voltage on the line.
If you have any trouble, try different values of base resistor until you
find what turns on the transistor.
You can, of course, use a relay provided that the current it draws for
the coil does not overload the RTS line. But, the transistor is much
cheaper, silent, and works with no time delay either opening or closing
the PTT circuit.
72/73, George
Fairview, TX 30 mi NE Dallas in Collin county
Amateur Radio W5YR, in the 54th year and it just keeps getting better!
R/C since 1964 - AMA 98452 RVing since 1972 Kachina #91900556
ChRAMADE wrote:
>
> Hello
> I am trying to find the diagram to build a PTT interface
> to activate my transceiver with the computer when
> sending PSK31 datas. Can anyone send me something ?
> I have tried those given with WinPSK and Digipan but it
> doesn't work with my FT-900. the PTT open circuit voltage
> is 13.5 v and closed circuit current is 15Ma. I would like
> to activate it with the RTS output of my computer.
> Should I use a relay ??
>.
------------------------------
Date: 23 Mar 2000 22:09:35 GMT
From: chramade@aol.com (ChRAMADE)
Subject: PSK INTERFACE FOR FT-900
Hello
I am trying to find the diagram to build a PTT interface
to activate my transceiver with the computer when
sending PSK31 datas. Can anyone send me something ?
I have tried those given with WinPSK and Digipan but it
doesn't work with my FT-900. the PTT open circuit voltage
is 13.5 v and closed circuit current is 15Ma. I would like
to activate it with the RTS output of my computer.
Should I use a relay ??
>.
------------------------------
Date: Fri, 17 Mar 2000 20:33:28 +1030
From: "Andrew" <ausdrew1@tpg.com.au>
Subject: Radio Frequency Technician - South Australia
This is a multi-part message in MIME format.
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Radio Frequency Technician - South Australia=20
-------------------------------------------------------------------------=
-------
I am the IT Consultant for Worksmiths IT Recruitment, 64 Henley Beach =
road, MILE END in South Australia.=20
We are currently recruiting a Radio Frequency Technician on behalf of a =
client. The candidate must know about circuit design. If you have this =
kind of experience please forward your resume to ausdrew1@tpg.com.au or =
post it to the above address as soon as possible .=20
Any enquires to ausdrew1@tpg.com.au
Regards,=20
Andrew Berry=20
------=_NextPart_000_0217_01BF9050.0D57BB20
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charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>
<DIV><FONT face=3DArial size=3D2><STRONG>
<P>Radio Frequency Technician - South Australia </STRONG></FONT><FONT =
size=3D2>
<HR align=3Dright>
<P></P>
<P></P></FONT><FONT face=3DArial size=3D2>
<P>I am the IT Consultant for <U><STRONG>Worksmiths IT=20
Recruitment</U></STRONG>, 64 Henley Beach road, MILE END in <U>South=20
Australia</U>. </P>
<P>We are currently recruiting a <STRONG>Radio Frequency Technician =
</STRONG>on=20
behalf of a client. The candidate must know about <STRONG>circuit=20
design</STRONG>. If you have this kind of experience please forward =
your=20
resume to </FONT><A href=3D"mailto:ausdrew1@tpg.com.au"><FONT =
face=3DArial=20
size=3D2>ausdrew1@tpg.com.au</FONT></A><FONT face=3DArial size=3D2> or =
post it to the=20
above address as soon as possible . </P>
<P>Any enquires to <A href=3D"mailto:ausdrew1@tpg.com.au"><FONT =
face=3DArial=20
size=3D2>ausdrew1@tpg.com.au</FONT></A></P>
<P>Regards, </P>
<P>Andrew Berry </P></FONT></DIV></FONT></DIV></BODY></HTML>
------=_NextPart_000_0217_01BF9050.0D57BB20--
>.
------------------------------
Date: Thu, 23 Mar 2000 05:11:09 -0700
From: "John Burch" <occupant@enetis.net>
Subject: Want: Suggestions on packet terminal software
What are the recommendations for terminal
software in a Pentium class notebook/laptop
running Win98? The unit will be hooked
to an average 1200 baud TNC.
Any advice or experience would be appreciated.
Thanks for your time
de John
occupant@enetis.net
...
>.
------------------------------
End of Ham-Digital Digest V2000 #84
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