[GreenKeys] SELCAL - auto start proposed

Mon, 19 Apr 2004 12:37:54 +0000

If we do selcal, there should be an option that would allow for copy of all messages sent, regardless of adressee.  Many people like to copy all that goes on the frequency and the use of selcal with a "copy all" option would give increased protection to conventional autostart from false starts caused by noise or off frequecy signals.

-- Roy Norris, K4EEG
> 
> From: Bob Camp <[email protected]>
> Date: 2004/04/18 Sun PM 10:20:12 GMT
> To: Don and Diana Cunningham <[email protected]>
> CC: [email protected]
> Subject: Re: [GreenKeys] SELCAL - auto start proposed
> 
> Hi
> 
> You can count me in as well.
> 
> How do we address the sort of thing that pretty much killed both the 
> VHF and HF nets I used to run on? Everything was ok as long as 60 wpm 5 
> level code was king. 100 wpm (as in model 28's) started to make people 
> itchy. As soon as 300 baud and ASCII came along you started to get lots 
> of junk printouts .... made things a bit of a mess.
> 
> A couple of possible options:
> 
> 1) Just define it from the start as 100 wpm five level and that's the 
> way it's going to be. Model 33's will have to be happy sitting on the 
> side lines or run eight level to five level converters.
> 2) Go with 110 baud ASCII and do five level to eight level conversion.
> 3) Go with something truly weird and convert to what ever you need 
> (like run PSK modulation ....)
> 
> My vote would be for five level code at 100 wpm with 170 shift FSK as 
> the modulation. That way we can run the good old stuff if we want to. 
> I'd be happy if the group decided on 60 wpm to let the 15's and 19's 
> participate. I only have 28's at this point ....
> 
> As far as SELCAL goes I would suggest a a slight departure from the 
> past. I would *enable* the ability to use a solid state gizmo to read 
> off the SELCAL and then fire up the model 28 using a solid state relay. 
> Receive operation would be more like a VHF net in that respect. More or 
> less send the magic words three or more times then follow with CR and 
> LTRS combo's to let give the receiving machines time to get up to 
> speed. The only need to send it all would be at the start of a QSO.  
> It's a little bit more of a delay than a "normal" hf net but a lot less 
> wear and tear on the machines.
> 
> I have a novel proposal as far as bands are concerned - modern HF seems 
> to be hung up on adaptive link stuff. There's no reason why we can't do 
> more or less the same thing. Receivers aren't the big deal they once 
> where. Why not do something like define the band based on the time of 
> day. If it's mid day the net is on 20 meters. If it's early evening 
> it's on 40 and it's on 80 at night. Poor mans ALE ... We'd need a 
> definition of who's morning noon and night we were talking about but 
> that's pretty easy. Heck put it all in a spread sheet and post it. The 
> only odd part would be deciding when to shift a QSO in progress.
> 
> One thing we do need - a net control who's willing and able to send the 
> daily bulletin. That's what defines on frequency and proves that you 
> can or can't bring up the machine correctly.
> 
> 	Take Care!
> 
> 		Bob Camp
> 		KB8TQ
> 
> 
> On Apr 18, 2004, at 3:36 PM, Don and Diana Cunningham wrote:
> 
> > Count me in too, Stan!!  Have a nice 28 KSR coming, so should be 
> > ready.  You
> > and I should do well on 80m.  Oklahoma is close enough to you.
> > 73,
> > Don, WB5HAK
> > ----- Original Message -----
> > From: "Stan Wilson" <[email protected]>
> > To: <[email protected]>
> > Sent: Sunday, April 18, 2004 7:50 AM
> > Subject: [GreenKeys] SELCAL - auto start proposed
> >
> >
> >>
> >> Back in the 60s several different frequencies were monitored by xtal
> >> controlled transmitters and receivers allowing easy exchange of 
> >> messages
> >> and data between RTTY stations.  One could always find a station 
> >> signal
> >> with which to adjust your equipment and verify band conditions.
> >>
> >> I would like to propose running a SELCAL system on 80 and 40 meters to
> >> increase activity and give us all signals we can use to test out our
> >> equipment.
> >>
> >> 3.6375 MHZ at 170 Hz shift was used on 80 meters.   Does anyone know 
> >> of
> >> any reason we could not use that frequency today ?  If it is clear I
> >> would be happy to obtain a batch of xtals so we can all be on the same
> >> frequency.
> >>
> >> I am also looking into a simple "electronic stunt box" design we can
> >> easily duplicate for SELCAL.
> >>
> >> Would appreciate your comments and suggestions for a frequency on 40
> >> meters as well.  Perhaps if we get started now we can all have 
> >> operating
> >> stations by this Fall ?
> >>
> >> De Stan AK0B
> >>
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> >>
> >
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> 
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