[aprssig] Simplex On the Road to Dayton

[Robert Bruninga]

>>> iago at pobox.com 05/03/06 1:51 PM >>>
>what does the audible sound like? i've done as you've 
>instructed and set my d7 to ctcss at 100. i'm assuming 
>that others in NM will start using this also - i'm definitely 
>NOT getting packet sounds; so i guess it's working.

Yes, but there are two gotcha's to also be mindful of:
1) the volume has to be up...so you will hear a packet
or voice call if someone is in simplex range of you.

2) You do have to be sure the squelch is set to 
"not busy" on no signal, or your TNC wont work.

#2 has kept me off the air for days, because I
or my kids bumpted the squelch control on the 
APRS side of the radio so that it is running open
squelch.  I dont notice it because either the volume
is down (the old way) or the radio is squelched 
due to CTCSS... but if the analog sqelch is still
open, the radio will never transmit.  Just
something to keep in mind on the D700...

When another voice alert station comes in range
of you, you will hear is occasional packet direct.
That is the "radar" alert that someone is nearby.
If you watch the display quickly, you can tell who
it is...

Or just push PTT and call him.

Bob, Wb4APR
Bill
KE5HWY

On 5/3/06, Robert Bruninga <bruninga at usna.edu> wrote:
> I posted this over on the AMSAT reflector to add to the
> fun of going to dayton... with APRS Voice Alert...
>
> Operating "52" simplex on the drive to Dayton is FUN.
> But unless everyone is calling CQ every 5 minutes,
> many "vehicles can pass in the night" and not know it.
>
> There is a another way to locate other mobiles that are
> in simplex range of you and that  is to operate an APRS
> Voice Alert "radar" detector listening for any passing APRS
> Voice mobiles.   Simply monitor 144.39 with a radio that is
> TONE squelched to CTCSS 100. (eliminates all packet noise).
>
> Normally you will not hear anything, becasue all the
> packets that are coming from the national infrasctructure
> APRS system digipeaters are transmitted without
> any PL.  But most mobiles that have set up for
> APRS-VOICE-ALERT do include PL100 on their
> transmissions and also listen by SPEAKER for any
> calls using PL100.
>
> Thus, if one of these mobiles (who is listening 100% of
> the time on 144.39 CTCSS 100 with a quiet speaker)
> passes within 5 miles of you, you will hear his occasional
> PL 100 packet and he can hear your PL 100 voice call.
> So if you ever hear any packets (CTCSS 100 on 144.39)
> it means someone is in DIRECT range of you and *IS*
> listening (CTCSS100).
>
> Give him a call "CQ Voice Alert" and suggest a QSY
> to "52" or any other common frequency.  You MUST
> use the words "voice alert" in your call, because the
> other driver is probably using a D700 and is probably
> listening to other radios as well, and he will have no
> idea that your call is coming in on 144.39 unless you
> say so, because he would otherwise assume that
> any voice he heard is comming in on the other band
> of his radio or another radio in his car where it does
> 99.99% of the time.
>
> Anyway, for those with D700's running APRS on
> Band A and running 2m or 440 on Band B, this
> gives them a "virtual 3rd radio" on a national
> calling frequency (APRS) to which they are ALWAYS
> listening.
>
> Just thought the rest of the community might want
> to listen for them on the long drive and make a
> SIMPLEX contact when one comes into view...
>
> de Wb4APR, Bob
>
>
>
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