[aprssig] Simplex On the Road to Dayton

[Bill York]

bob,

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.

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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