[OZAPRS] 300 baud TNC

Ben Lindner-VK5JFK vk5jfk at activ8.net.au
Tue Jan 12 03:38:25 EST 2010


Just skip a few bottles of a quality Red and you should have one in a 
few weeks :-)

cheers
Ben

Scott Evans wrote:
> Hmm... I'm sure that not many are going to explore that path!... (but 
> a nice present non the less!)
>
> Oh and can someone donate one for my 40m HF gate! (Joking)
>
>
> On Mon, 2010-01-11 at 17:46 +1000, Jack Chomley wrote:
>> Tim,
>>
>> One of the great features of the SCS DSP tracker is its ability to 
>> decode off frequency signals on HF. The older TNCs cannot do this at all.
>>
>> From SCS Manual:
>>
>> *The DSPTNC supports the following Packet-Radio operating modes:*
>> Parameter Mode
>> 300 300 Bd AFSK (old HF-Packet-Radio standard)
>> TX center frequency default at 1700 Hz (1600 Hz “Space“, 1800 Hz “Mark“).
>> RX center frequency: 1700 Hz ±400 Hz, automatically tuning
>> R300 200/600 Bd Robust-Packet-Radio (RPR), automatic selection of speed.
>> TX center frequency fix at 1500 Hz
>> RX center frequency: 1500 Hz ±240 Hz, automatically tuning
>> UI-packets (APRS, Unproto) are transmitted with 200 Bd RPR.
>> R600 Like R300, but UI-packets (APRS, Unproto) are transmitted with 
>> 600 Bd RPR.
>> 1200 1200 Bd AFSK.
>> 9600 9600 Bd Direct-FSK (G3RUH).
>> 19200 19200 Bd Direct-FSK (G3RUH).
>>
>> *Highlights of the Modem-Implemtations in the DSPTNC:*
>> Generally very reliable and “flicker free” DCD achieved with special 
>> DCD algorithms on the
>> signal processor.
>> *New developed multi-detector for 300 Bd AFSK. The signal processor 
>> automatically*
>> *processes a frequency range of ±400 Hz looking for 300 Bd 
>> transmissions and receives all*
>> *detected signals in parallel.*Exact tuning by the user is not 
>> necessary any more as a perfect
>> tuning on the receiver side is always achieved automatically. If 
>> manual tuning of the RX frequency
>> is desired, the *DCD-LED*can be used for that purpose. It lights 
>> greenif the actually
>> received packet has a frequency error of less than +-40 Hz, otherwise 
>> itlightsred.
>> Special transmit- and receive filters for 1200 Bd AFSK, to avoid 
>> adjacent channel interference
>> and degradations by AC hum.
>> Adaptive DC-removal by the signal processor at 9600 und 19200 Bd 
>> Direct-FSK.
>>
>> Whilst these units are not cheap, they work very well as an HF IGATE 
>> unit, due to their off freq decode ability.
>>
>> 73,
>>
>> Jack VK4JRC
>>
>> At 04:38 PM 1/11/2010, you wrote:
>>> Thanks for the replies guys, I have two things in mind. 1) a 
>>> crossbanded HF to
>>> VHF tracker, I have now got the Codan NGT running with a TT3 and 
>>> would like to
>>> be able to use a portable tracker away from the vehicle, i have a 
>>> Kenwood HT
>>> with a gps and TT3 attached to it that goes great in a backpack. 
>>> Both the KAM
>>> and the SCS dsp seem to be able to do this.
>>> 2) Be able to use it at home to be able to "see" hf stations, 
>>> possibly even
>>> using it as a temporary/semi permenant 40m gate.
>>> The SCS dsp is definately an option as a new unit, possibly better 
>>> than the
>>> Kantronics ? They are both fairly close in pricing. The tracker 2 would
>>> definately do just fine for home but can it have 2 radios and baud 
>>> rates at the
>>> same time ? I will look it up ! I have also just stumbled accross a 
>>> KAM plus on
>>> ebay that finished yesterday and went for $ 143 us.
>>> Cheers Tim VK2HLT
>>>
>>> Quoting Phillip <zl2tze at yahoo.com.au>:
>>>
>>> > Hi Tim,
>>> > Do you want this for mobile use or base station ?
>>> >
>>> > 73 Phillip
>>> > ZL2TZE
>>> >
>>> > _______________________________________________
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>>> > OZAPRS at aprs.net.au
>>> > http://lists.aprs.net.au/mailman/listinfo/ozaprs
>>> >
>>>
>>>
>>>
>>>
>>>
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>>
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>
>
> --
> *Scott Evans VK7HSE*
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