PSN-L Email List Message

Subject: Question About Analog Seismo Telemetered On 163.797 in So.Cal
From: Douglas Gavilanes gavilan1@.............
Date: Wed, 06 Apr 2005 15:35:00 -0700

Greetings from under my rock.  I have received a few questions recently 
from fellow amateur radio folks about the *general* location of the 
seismo that is currently telemetered via VHF (163.797MHz) into the LA 
basin (for the Caltech Seismo Lab).  I'm not seeking an exact location.  
Most believe it to be located at Crystal Lake, L.A. Co., but I believe 
having heard that it was on Catalina Island.  The Crystal Lake seismo 
(which most of us affiliated with PSN Pasadena listened to) was just off 
of 162.810, but it went fiber or satellite ages ago.  Many of us built 
discriminators back then for its 680Hz tone, with data outputs, alarms, 
etc.  In any case, a few ham folks would like to know which way to point 
a dedicated beam antenna for best signal reception.  Since it is so 
weak, one can't be sure if their antenna is aimed at the transmitter, or 
at a reflection off of a mountain or building.  Any direction here (pun 
intended) is appreciated.  Off list is OK, if you're concerned.


Doug Gavilanes
Garden Grove, CA.


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