[aprssig] timeslotting on HF ? was > 15. APRS trackers on 10m (Robert Bruninga)

Wes Johnston aprs at kd4rdb.com
Sun Nov 27 13:06:51 CST 2005

How many radios on the market today can be controlled by serial port?
Kenwood d700 / d7 can be... which others?  any icoms?  I know HTs you
can clone, but that requires a special mode on the HT, and plugging into
the speaker jack....

I like this idea... it's something that James Jarvis and I discussed at
DCC a couple of years ago... a pic that would alter the beacon text of
the d700 when you QSY.  BUT... what other radios can a pic talk to to
interrogate the operating frequency?


Robert Bruninga wrote:
>>>>kmcaviezel at yahoo.com 11/26/05 1:28 PM >>>
>>users could sign up for a couple slots per hour...
>>If each slot was 2 seconds long...
>>Each slot could be defined by a two byte code,
> I agree that time slotting would be a good idea 
> if it were implemented seamlessly, but would
> be impossible and just a nightmare if we had
> to "assign" time slots.   I think it is far better
> to just decide an algoirthm based on the users
> call and to let that automatically assign a time
> slot.  The algorithm would be published so that
> anyone could implement it and also be able to
> determine any conflicts.
> I would propose an algorithm based on the
> last two letters in the (XX) call plus the SSID (S).
> For example, just SUM the ascii value of X+X+S
> and subtract 2*64 (the ASCII offset of "A")
> and the ASCII offset of "0" would give a range
> of 68 slots.  Multiply by 60/68 to scale it to
> 60 seconds.
> And use the Mic-E format which can easily
> generate a packet in under .5 seconds and
> this wouild allow for the digipeat as well.
> Remember, if these are being digipeated 
> over to 144.39 with CSMA, then the natural
> hold-off until the channel cleared on 144.39
> would allow for additional significant savings
> by amortizing multiple of these fames in
> a single packet with only one TXD. 
> We cannot implement slotting on 144.39 
> and dont need to, since digipeaters can
> do a pretty good job with CSMA because they
> do hear pretty much of everything.  The only
> place we need the slotting is on the input 
> frequency and since we would be starting with
> a new virgin frequency with a new design, then
> we could make sure that slotting is used and
> would avoid the hiddne transmitter problem.
> This would be scalable to large numbers which
> is just exactly what we need to get APRS more
> widely used in the Amater Radio Service.
> Remeber, the ARRL is looking for a way to have
> AUTOMATIC Station position AND FREQ 
> identification so that we can be more responssive
> in times of emergency.
> NEW IDEA.  THEREFORE any PIC processor designed
> for ANY new tracker SHOULD have tha ability to
> interrogate any other RADIO in the vehicle so that
> it can include the FREUQUENCY of VOICE operation
> in the position beacon,.    WOW, this is starting to
> look like a REAL forward reaching project!
> Bob, WB4APR
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