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[aprssig] Coverage holes in OK?

Alex Carver kf4lvz at yahoo.com
Sat Jan 7 21:47:20 UTC 2012


According to Lynn's network maps, the only digipeaters between Amarillo and Tucumcari are actually _IN_ Amarillo and Tucumcari.  The Tucumcari digi is labeled "TUCARI" and the Amarillo digis are "RANDAL", KE5KUL and "WAYSID"



According to the more recent aprs.fi data, there's a string of I-gates plus a couple digis in and around Tulsa.  I managed to hit one while I was still east of Oklahoma City between Sallisaw and Checotah but that was pretty much the last thing I hit until I got within range of the SOKC digi in Oklahoma City.  Once I passed OKC I had nothing at all until Amaraillo.  Even the map shows nothing in that area between OKC and Amarillo.


________________________________
 From: Earl Needham <earl.kd5xb at gmail.com>
To: Alex Carver <kf4lvz at yahoo.com>; TAPR APRS Mailing List <aprssig at tapr.org> 
Sent: Saturday, January 7, 2012 5:44 AM
Subject: Re: [aprssig] Coverage holes in OK?
 

Between Amarillo and Tucumcari there is ONE digi, and I can't remember it's "Title" just now.  However, finding a hole in that area is probably correct.

East of Amarillo, I sometimes get into the digis at Pampa or one of the others north of I-40, but you have to be hill topping to do so.  Same thing going across I-40 in Oklahoma, except the digis seem to be south of I-40.

I'd REALLY like somebody (besides me) to travel I-20 west from Fort Worth and report what they find there.

Vy 7 3
Earl
KD5XB-11



On Fri, Jan 6, 2012 at 7:53 PM, Alex Carver <kf4lvz at yahoo.com> wrote:


>
>
>
>On 1/6/2012 2:34 PM, Alex Carver wrote:
>
>
>I had my D700 with me at 25 watts with a 3 minute beacon going out as WIDE1-1,WIDE-2-2 (covered all areas so that I didn't have to fiddle with the radio en-route).
>Hopefully that was WIDE2-2 and the WIDE-2-2 was a typo?
>
>Yeah, just a typo.  You'd know if it wasn't from the raw data, though. :)
>
>
>Looking at the map, there were some huge holes in Oklahoma.  I didn't exactly expect that given the flatness of OK.  I was picked up very well in Oklahoma City but didn't get digipeated or gated until I reached Amarillo, TX.  East of Oklahoma City there was another large hole between Oklahoma City and Ft. Smith, AR.
>>
>If you want an idea of coverage before doing such an extensive drive
>    (handy for telling the family where NOT to be concerned if they
>    don't see you moving), see http://tinyurl.com/APRSAct24 and
>http://tinyurl.com/APRSAct00 for APRS coverage maps.  You have to
>    look closely at the file dates to find the most recent and now that
>    I look at them, I need to restart the batch job for the new year. 
>    But there's enough there to get the idea.
>
>
>
>>
>Note, I'm considering a hole as an area where I traveled 50 miles or more without a single gate or digipeat (digipeat being the D700 saying MY POS if it managed to hear its own packet).  All these areas were quiet both in the car and on APRS-IS given the track data.  Other than these hols coverage was pretty good even in remote places and small towns (like Alexander City, AL).  Coverage in NM, AZ, and CA most likely benefited from mountain top sites that could cover huge areas easily.
>>
>Well, not hearing a MY POS doesn't necessarily mean that you're in a
>    hole, but you're in an area where one of the following is true.
>
>a) No digipeater was within range or
>b) Digis in range didn't decode your transmissions or
>c) Your D700 didn't hear the digipeat or
>d) Your D700 didn't decode the digipeat.
>
>
>Actually e) The D700 was completely quiet during these periods with zero activity on the channel.  I had the display set up high on the dashboard so I could glance down to make sure the GPS indicator was blinking.  On the trip to FL my GPS
> cable loosened so I wasn't sending anything from Barstow, CA all the way through Flagstaff, AZ when I discovered the loose cable.  I kept an eye on the GPS for the return trip.  I could also see any packet activity going on with the display up on the dash.  Most of those holes were completely dead zones without a single packet.
>
>Interestingly enough I did get one Voice Alert contact during the entire round trip, only one though.  It was a mobile traveling through southern Georgia on SR-580 while I was doing the same in the opposite direction.  We had a short conversation on 146.520 until we were out of simplex range.  Never heard anything else during the trip.
>
>
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