Hi Quick “front end” check list:
The old Oncore modules were not the greatest for sensitivity. Compared to what you get today, they are a bit deaf. What that turns out to mean is that you need a bit more antenna gain with them than with a newer module (either a newer Oncore or a newer part from somebody else). Something around 30 db of antenna pre-amp gain with < 10 db of coax loss is about right for them. They will overload if you get up to the 39+ db preamp range and < 3 db of coax loss. How much they overload depends on the crud in your local environment. The Lucent boxes (like just about all similar gizmos) put out +5V to the antenna . There are indeed antennas that need > 7V to do their thing. How well they work / if they work at 5V - who knows. I would not try it. Since you get a “40 - 50” db signal to noise once you lock on to a sat, the preamp gain is a bit weird. It very much impacts satellite acquisition, and has less impact once you are locked on. A marginal antenna gain can give you a “long start”, but then lock on to a number of sats once things get going. That can make it tricky to spot the problem. Bob > On May 30, 2015, at 9:38 AM, Martin VE3OAT <[email protected]> wrote: > > Ulli, > Sorry that I haven't been following your correspondence so I am coming into > the middle of this. The fact that you receive so few satellites says to me > that there is a problem at the front end. You said you had changed the cable > to the antenna and the antenna itself so those parts seem OK at least. Are > you using an active antenna and does the unit provide the required voltage > for it? Sorry if you have already checked that. > ... Martin VE3OAT > > Ulli wrote : > > At least, i saw 1 or 2 satellites from time to time. > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
