On Thu, Aug 11, 2011 at 4:22 PM, Patrick May
> One of the things I think a lot of people are not understanding is
> what the OP means by "the Valley." That's the Southern San Joaquin
> Valley in California.
Well, Chris first described it as a remote valley. The San Joaquin
Valley probably wouldn't be considered a remote valley.
> The area that's he's trying to serve is probably
> an OHV route in a canyon or small valley (just a few miles wide at the
There you go... Chris went on to name the valley, Black Gulch (and the
highway running through it Highway 178), which is not quite the whole
southern San Joaquin Valley.
> The "fill in" digi would have an effective HAAT of 6,000 feet
> to the south, west and north west
That would require one extremely large tower to get a HAAT of 6000
feet. Lightner Peak which would look down into Black Gulch is only
about 6,400 feet ASL. Breckenridge Mountain further away where it
would not do as good of a job seeing into the Gulch is about 7,500
feet ASL. The Kern River in the bottom of the Gulch is at about 2100
feet. To get a Height Above Average Terrain of 6,000 feet, Chris would
need a tower about 3,000 feet tall on top of Lightner Peak. Notice
that the "AT" in HAAT stands for Average Terrain, not absolute sea
> I'm assuming the proposed station
> is probably between Visalia and Bakersfield.
Northeast of Bakersfield to be precise.
> At 6,000', he might even
> be seeing into the Mojave Desert through the Tehachapi Range. What
> makes for great voice repeater locations makes for some issues in a
> system like APRS.
Hence the many suggestions to NOT place the APRS fill-in digipeater on
the TOP of a mountain, but rather to use the mountains to shadow it
from the surrounding area, and to focus it's receive area into the
valley of interest (Black Gulch).
> Personally I wouldn't run any of the WIDE paths. Run something
> "non-standard" for the path that it will digi and just reach out to
> your local 4x4 and other clubs that might make use of the digi.
That has also been suggested, but Chris would like the fill-in
digipeater to be able to boost people out of the valley (Black Gulch)
without requiring the end users to have to change their mode of
operation. That would mean that a WIDE1-1 fill-in digipeater down on
the side of the hill looking into the Black Gulch valley would the the
"best" solution given the specified parameters.