[PCR-1000] Sat reception and adjacent chan filtering

[Brian Winter]

The local pager problem I referred to in a previous thread is mentioned =
in http://www.g4loe.freeserve.co.uk/receptio.htm amongst very many =
others.  I guess its also possible that theres a PC processor bus at =
133Mhz close by ?



A solution for the home constructor may be found at David Taylors =
excellent site

http://www.david-taylor.pwp.blueyonder.co.uk/wxsat/filters/HelicalNotch.h=
tm

David is the "god of weather sat reception" and related.  The brain =
behind the calculation engine for SatScape and others.



Of course, one of the many receivers built specifically for the job =
might be best, if a lttle more expensive !!!
http://www.hffax.de/Hardware/APT_Receiver/hauptteil_apt_receiver.html=20


Timestep have a complete system solution, but one element worth =
considering is a head-end amplifier built specifically for this job - =
with filtering etc.  I have no idea if this will be good enough for your =
local conditions of course.

http://www.time-step.com/apt/apt.htm

APT 137 Preamplifier

This preamplifier has 3 separate functions. The first to increase the =
sensitivity of the receiver so that you can receive low passes if you =
want to. The second to recover the loss of the co-ax cable. And the =
third is to provide extra RF filtering which is achieved by an =
additional 3 tuned circuits. The preamplifier fits directly underneath =
the polar antenna.







Hope this helps

bw


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