[amsat-bb] TNC Question

Kelley kshaddrick at jetup.net
Sat Jun 21 23:40:29 UTC 2014

Thanks everyone for all your suggestions.

I've been testing the unit on the APRS frequency of 144.390 MHz while 
playing with the various settings suggested. I am not using host mode 
(KISS). I have the KPC-3+ (version 9.1 firmware) connected to my Icom 
IC-746 via the accessory ports on the rear of the radio. The radio 
provides a unsquelched constant audio output. With this setup, I am free 
to play with the volume control on the front as it has no impact on the 
output to the TNC.

Having said all that, here is my problem. With the volume turned up, I 
can hear the packets the radio is receiving. I can see the Rcv LED light 
up on the TNC. However, I do not see most of the packets I hear 
displayed in the software (Teraterm, Winpac, UI-View, etc.).

Before changing the settings, I used the restore command to set the TNC 
to factory defaults. I have configured the TNC with all the settings 
suggested below. I also have passall set to on. I see about 1 in 10 
packets displayed. When listening to ARISS, I see even less. I assume 
that with the current settings, I should see even the bad packets 
displayed. Perhaps my assumption is incorrect.

Have I missed a setting? Perhaps the audio level from the accessory port 
on my IC-746 isn't at a high enough level? Any assistance would be 
greatly appreciated.



Kelley - WØRK

On 6/19/2014 7:52 PM, JoAnne Maenpaa wrote:
> Hi Kelley,
>> ... searching for settings specific to this unit for ARISS work
> I'm not familiar with the Kantronics syntax for typing commands but
> see below for a general summary of the parameters you may find useful.
> ARISS has a summary of hardware TNC and soundcard TNC operations
> posted at:
> http://www.ariss.org/uploads/1/9/6/8/19681527/k9jkm_2012_symposium_ver
> 2.pdf (careful, might line wrap this URL)
> The list of parameters you will find useful but may need to adapt to
> Kantronics syntax:
> MYCALL - Your Callsign Default is NOCALL, but you want others to know
> you are there.
> DAYTIME - YYMMDDHHMM Used if you want to timestamp the packets you are
> receiving.
> MONITOR ON - Displays all packets on the frequency
> MALL ON - Displays all packets on the frequency (connected or
> unconnected)
> MCOM ON - Displays the AX.25 protocol with the message (might clutter
> your screen)
> MCON ON - Allow you to see all packets even when in CONVERS mode
> MSTAMP ON - Monitored packets are timestamped
> MRPT ON - Displays the entire digipeat path for the packets.
> CONSTAMP ON - Connect and disconnect status messages are timestamped
> HEADERLN ON - Header information is displayed on separate line from
> message text
> PASSALL ON - TNC will accept and display packets that have errors
> (noise). Partial packets, even with errors, are often still readable
> to the human eye.
> PASSALL OFF - TNC will only accept and display packets that have
> complete CRC.
> CONVERS <enter> - Mode to type packet message from keyboard directly
> to the TNC. Ctrl-C will exit CONVERS mode.
> MHEARD <enter> - Displays your TNC's "heard" list (updated only when
> UNPROTO CQ VIA ARISS - Most basic string for ARISS to copy, route, and
> digipeat your packet
> --
> 73 de JoAnne K9JKM
> k9jkm at amsat.org
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