[aprssig] Hardware for new APRS Digi?

Mark Earle wa2mct at mearle.com
Wed Aug 5 15:55:20 EDT 2009


Kent Hufford wrote:
> In the county we need to setup two more standalone Digi's. My initial idea
> is KPC-3+ and FT-1802, since they don't make the FT-1500 anymore.
>
>   
I would only consider a commercial grade radio, with good helical 
resonator front end. One that does NOT receive over a wide range. 
Further, you might plan on a notch cavity. Further, you should have a 
circulator on your output. Further, use a commercial grade antenna, 
helical feedline (not coax), good grounding, mount all gear in a cabinet 
which grounds each piece, etc. [Note: Commercial Grade antenna is not a 
Comet or Diamond]

Using amateur grade gear, at a commercial site, is generally a 
disappointment. You will experience degraded performance on receive and 
you may cause problems for other site.

You might get away with your proposed radio IF you are the only radio at 
some site. If there are other users, make yourself a good neighbor and 
do it right.

I cringe when I see the improper radio used a a multiuser site.

KPC-3+  seems popular as the TNC. TNC-X with digi board is another, 
TNC-2 various flavors with UIDIGI would be good also.
> thanks in advance
> Kent
> KQ4KK


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