[OZAPRS] 300 baud TNC

[David and Justine Olsen]

G'day gents

How much is not cheap, and where does one obtain an SCS DSP tracker?

David

On 13 Jan 2010, at 03:34, Mike Zwingl oe3mzc wrote:

> this is really the only choice for short wave!
> ----- Original Message -----
> From: Jack Chomley
> To: Australian APRS Users
> Sent: Monday, January 11, 2010 8:46 AM
> Subject: Re: [OZAPRS] 300 baud TNC
>
> 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  
> green if the actually
> received packet has a frequency error of less than +-40 Hz,  
> otherwise it lights red.
> 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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