[OZAPRS] 300 baud TNC

Wed Jan 13 12:50:12 EST 2010

Hi The SCS in a great TNC but the interface is USB and not as easy to work with as most TNC,s the way the commands work is quite different to most TNC,s and caused me some grief. It requires the Esc character to proceed any command data without the Esc command it sends the data to the radio port. The best solution I came to is to use AGWPE  it sort of works with UiView in kiss mode but it's better to use AGW then run UiView in host mode.

Regards Rob Thirkettle ZL3RX          

Dept  Physics & Astronomy

University of Canterbury     

Private Bag 4800,         

Christchurch 8020,

New Zealand

Tel: +64 3 364 2510

Fax: +64 3 364 2469

mailto:rob.thirkettle at canterbury.ac.nz

From: ozaprs-bounces at aprs.net.au [mailto:ozaprs-bounces at aprs.net.au] On Behalf Of Mike Zwingl oe3mzc
Sent: Wednesday, 13 January 2010 6:34 a.m.
To: Australian APRS Users
Subject: Re: [OZAPRS] 300 baud TNC

this is really the only choice for short wave!

	----- Original Message ----- 

	From: Jack Chomley <mailto:radio at irock.com.au>  

	To: Australian APRS Users <mailto:ozaprs at aprs.net.au>  

	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
	> 
	> _______________________________________________
	> OZAPRS mailing list
	> OZAPRS at aprs.net.au
	> http://lists.aprs.net.au/mailman/listinfo/ozaprs
	> 

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