[aprssig] unusual Terrestrial APRS propagation

Paul Bramscher pfbram at comcast.net
Mon Aug 31 18:38:59 CDT 2015


No errors in reasoning.  I indeed heard 2m "DX" (Kansas and elsewhere to
Minnesota) -- but ONLY on 144.390 Mhz.  If 2m was genuinely open to
tropo ducting, etc. it wouldn't manifest solely on that freq.  This was
in the daytime over the weekend.  If I truly had a 300-400 mile range on
2m, broadly speaking, there would have been many distant phone
conversations elsewhere on 2m.  Instead, there were none at all.

Likely someone was just re-TX'ing internet traffic locally.

73, KD0KZE / Paul

On 8/31/2015 6:08 PM, Ev Tupis via aprssig wrote:
> You didn't hear any DX, therefore the band is not open?  lol.
> 
> That's a common error-in-reasoning.  It is why the 10 meter PropNET
> project (APRS on PSK31) involves stations that both auto-ID 24x7 but
> also have robots that can be interrogated...in case the band is open but
> there are no human operators awake at the time...except you of course.
> 
> I gotta go...I hear a VE3 working into the Dakotas on 2 meters and I'm
> hoping that the big-red-blob makes its way just a little farther East.
> 
> L8r.
> 
> Ev, W2EV
> 
> ------------------------------------------------------------------------
> *From:* "pfbram at comcast.net" <pfbram at comcast.net>
> *To:* Ev Tupis <w2ev at yahoo.com>; TAPR APRS Mailing List <aprssig at tapr.org>
> *Cc:* Nagi Punyamurthula <n0agi at n0agi.com>
> *Sent:* Monday, August 31, 2015 5:34 PM
> *Subject:* Re: [aprssig] unusual Terrestrial APRS propagation
> 
> I heard alot of APRS stations from Kansas and elsewhere from my QTH also
> (same metro area as Nagi, but different corner of it).
> 
> I suspect it was just IS->RF traffic.  Elated at first, but then I
> conducted a test -- I shut down my igate and twiddled the tunner across
> 2m, generally speaking..  Also set it up to scan.  Didn't hear any
> distant 2m VHF FM voice conversations.  If it was a 2m propagation
> anomaly, I would have expected distant phone conversations.
> 
> 73, KD0KZE / Paul
> 
> ------------------------------------------------------------------------
> *From: *"Ev Tupis via aprssig" <aprssig at tapr.org>
> *To: *"Nagi Punyamurthula" <n0agi at n0agi.com>, "TAPR APRS Mailing List"
> <aprssig at tapr.org>, "TAPR APRS Mailing List" <aprssig at tapr.org>
> *Sent: *Monday, August 31, 2015 2:49:43 PM
> *Subject: *Re: [aprssig] unusual Terrestrial APRS propagation
> 
> 
> 
> Tropospheric inversion layer.  Big time.
> 
> There are 1000km QSO's taking place on 144, 222 and 432 MHz since yesterday.
> 
> Ev, W2Ev
> 
> 
> 
> ------------------------------------------------------------------------
> *From:* Nagi Punyamurthula via aprssig <aprssig at tapr.org>
> *To:* TAPR APRS Mailing List <aprssig at tapr.org>
> *Sent:* Monday, August 31, 2015 7:39 AM
> *Subject:* [aprssig] unusual Terrestrial APRS propagation
> 
> I have been monitoring the VHF APRS propagation
> <http://aprs.mountainlake.k12.mn.us/> map the last few days and have
> been noticing an unusually long range propagation.  Very rarely does my
> APRS sysop station hear others beyond the MN, IA, SD, ND, KS, WI, IL
> states – even w/ some previously experienced solar flares/storms. 
> Anyone has any hints on what might be causing this out of norm propagation. 
>  
> 
> I was monitoring http://SolarHam.com/ <http://solarham.com/> for some
> info and found this from 2 days ago.
> 
>  
>  
> Thanks
>  
> 73, N0AGI-Nagi
> 
> http://N0AGI.com/ <http://n0agi.com/>
>  
>  
>  
> 
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