[amsat-bb] Re: TNC Problem
almetco at comcast.net
Wed Aug 13 20:13:50 PDT 2008
I was running it at 1200BPS for the tests. I can receive all packets from
APRS on UIVIEW and HyperTerminal. My Kenwood HT call N3MVF-2 can even send
a message to N3MVF on APRS software through the TNC and into the laptop.
With the HT feet away, I cannot connect or ack the message back from the
laptop/TNC. I get on the Icom TX that empty carrier. Same symptom on both
TNCs. In summary, recives, keys TX at TNC and radio but cannot connect loop
test back to mycall/N3MVF on TNC or hear packets transmitted at 1200baud
Good to know abt the 9600 too.
16 years of packet and sat BBS and I'm stumped.
From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of SV1BSX
Sent: Wednesday, August 13, 2008 9:27 PM
To: Gregory Dober; amsat-bb at amsat.org
Subject: [amsat-bb] Re: TNC Problem
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
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
> 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
> APRS and digital modes about a year ago on an older computer with a serial
> Perplexed as I awaited GO-32.
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