Order Tray | Contact Us | Home | SIG Lists

[aprssig] APRS DFing SUCCESS with only an HT!

Robert Bruninga bruninga at usna.edu
Wed Jul 25 22:01:21 UTC 2007


> I miss the days of driving around town...
> and then hopping out of the car to go sniff 
> around with an HT (antenna off...) using 
> body blocking 

You bet, and body blocking really works.  That is how I got to
within the needed 6 feet of the balloon in the cornfield.  The
signal was just so strong, I had to hold the HT to my chest
(without an antenna) and rotate... Took me right to it.  The
peak is VERY broad, but the null is very precise.  Straight out
your back (opposite the direction of the fade)...  Right?

Bob

> Robert Bruninga wrote:
> > To see a great view of DFing using only your mobile and an
HT,
> > see the 5 map views of my track while recovering a tiny
balloon
> > payload yesterday. (A key-chain 433 MHz oscillator and tiny
> > balloon (no APRS)).
> > 
> > These views are less than 100k images but very cleary show
how
> > easy it is to find ANY RF source without any special DF
> > equipment, using only your mobile rig and HT with OMNI
antennas.
> > 
> > 
> > I have added this series of annotated map images and a
> > description to my usual APRS DF-ing web page:
> > http://www.ew.usna.edu/~bruninga/dfing.html
> > 
> > Slide down about 70% down the page and look for HT-ONLY
DF-ing:
> > 
> > Remember, on the east coast we don't get many balloon
launches
> > because they all go out to sea.  So pardon my excitement.
But
> > this experience again proves, that we can DF anything with
just
> > our own rigs if we just take the time.  I have been
preaching
> > this for years, (usually from the APRS perspective), but you
> > simply don't need any technology.  Just your ear and the
ability
> > to HEAR (and mentally visualize) signal strength (quieting
> > quality) and the patience to bracket the signal as you get
> > closer.
> > 
> > Bob, WB4APR
> > 
> > 
> > _______________________________________________
> > aprssig mailing list
> > aprssig at lists.tapr.org
> > https://lists.tapr.org/cgi-bin/mailman/listinfo/aprssig
> > 
> > 
> 
> 
> _______________________________________________
> aprssig mailing list
> aprssig at lists.tapr.org
> https://lists.tapr.org/cgi-bin/mailman/listinfo/aprssig
> 





More information about the aprssig mailing list