[aprssig] KISS TNC - Calibration function to set deviation correctly

Mark Cheavens mcheavens at usa.net
Wed Aug 19 15:36:45 CDT 2015


On 8/19/2015 3:34 PM, Stephen H. Smith wrote:
> On 8/19/2015 1:55 PM, Mark Cheavens via aprssig wrote:
>> In the past I have burned custom two configuration ROM's or swapped 
>> ROM's so
>> that I could calibrate TNC's that are used in KISS mode.
>>
>> I am looking for a way to send 2200 and 1200 tones from a KISS mode 
>> (only) TNC
>> to set the deviation correctly.
>>
>> - As an alternative I could "get by with" a long packet burst (5 
>> seconds or
>> more) from the TNC that I could repeat.
>>
>> - I primarily am using *nix distributions.
>>
>> (Google searches have led me nowhere...)
>>
>> Sincerely,
>> Mark
>> KC5EVE
>
> Are these TNC-2 clone devices?
>
> If so, make a "double-decker" ROM in a 27512 instead of a '256. Put 
> your KISS code in one half and a standard TNC-2 TAPR 1.1.8 or 1.1.9 
> code with the cal routine in the other half.   Grounding or +5VDC on 
> pin 1 of the standard eprom will select between the two halves of a 
> 27512.
>
As I stated above that is what I did in the past.
- These are TNC-X's.

Mark



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