At 01:14 AM 4/29/2010, Lot wrote:
Hi Everyone,
Our club bought a Dstar Repeater (IDRP4000v & IDRP2C).
For some reason the receive sensitivity is very poor. ...
Lot / K6IRF
<http://www.harpusa.org>http://www.harpusa.org
Here are some tips I've picked up from the people who have successfully
operated ICOM D-STAR repeaters:
#1 - an external band pass filter.
#2 - a preamp (making the band pass filter even more important)
#3 - replace internal coax jumpers with double-shielded coax.
#4 - RF shielding/bypass for the ethernet/USB connections
#5 - did I mention an external band pass filter?
#6 - do everything else you need to do for an analog repeater (check
duplexer, feedline, antenna, desense)
Have you successfully operated an analog repeater from this site? On this
frequency? That's a pretty expensive way to test a site and frequency, but
that's what it took for some repeater owners to solve a problem. It's very
difficult to diagnose problems with D-STAR equipment using standard analog
test equipment, but if there's a mix or spur signal on your receive
frequency, an analog receiver will reveal it.
73,
Gary KN4AQ
ARVN: Amateur Radio//Video News
Gary Pearce KN4AQ
508 Spencer Crest Ct.
Cary, NC 27513
<mailto:[email protected]>[email protected]
919-380-9944
www.ARVideoNews.com
