[amsat-bb] Re: TNC Problem

SV1BSX sv1bsx at yahoo.gr
Wed Aug 13 18:27:18 PDT 2008

Hi Greg,

sorry for asking but, have you before any experience with 9600 bPs  ???

9600 is a direct, pure FSK signal, not AFSK like 1200 bPs in order to hear
Therefore, you can not hear anything else than short carrier-bursts
("quick empty carrier" as you correctly pointed out).

So, if you heard just a carrier on  another radio, that is 100% normal for
9600 bPs.
I can't see any problem on that.

73, Mak SV1BSX

----- Original Message ----- 
From: "Gregory Dober" <gjdober at comcast.net>
To: <amsat-bb at amsat.org>
Sent: Thursday, August 14, 2008 3:36 AM
Subject: [amsat-bb] TNC Problem

> Went back to attempting to work digital modes on the birds.  Hooked a new
> Timewave 9600 and was able to communicate immediately by hyperterminal.  I
> tried a loopback test and couldn't connect to my callsign though the TNC
> would light TX.  Went to an APRS program, connected the TNC to my Icom and
> was able to copy stations.  When I would transmit, TNC, radio all keyed up
> but I heard no packets on another radio.  Just a quick empty carrier.
> Borrowed my friends AEA PK 900.same problem.
> Never had this problem on past TNC's or laptops.  The only difference is
> they all had direct serial connections to the laptop.  The Dell Inspiron
> is
> about 6 months old and uses the serial to usb connections.  I have two
> Belkins for the com ports.  Are some serial to usb connections problematic
> for the TNC?  This is the only change I can note since I last worked
> packet.
> APRS and digital modes about a year ago on an older computer with a serial
> connector.
> Perplexed as I awaited GO-32.
> Greg
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