You are correct about the elevation mask and it, too, can be changed via TBoltMon. However, the Thunderbolt and the Z3816A both had the elevation mask set to 10 degrees. They were running off the same HP timing antenna with 25 feet of RG-58 to a 58536A Symmetricom GPS distribution amplifier and then a short RG-58 jumper to the respective receivers with N to BNC adapters everywhere and BNC connectors on the RG-58. Clearly not the most ideal cable system but it works for comparison.
Joe -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of John Miles Sent: Thursday, August 28, 2008 9:49 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Trimble Thunderbolt - Receive Sensistivity The elevation mask might also come into play. Ordinarily you don't want to consider input from satellites too near the horizon, as terrestrial features can distort the signal's timing. I think it can be stated with confidence that there's nothing wrong with a (normally functioning) Thunderbolt's sensitivity specs, and that putting random amplifiers, splitters, and such into the antenna lead might be counterproductive. -- john, KE5FX > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > Behalf Of J. L. Trantham > Sent: Thursday, August 28, 2008 7:39 PM > To: 'Discussion of precise time and frequency measurement' > Subject: Re: [time-nuts] Trimble Thunderbolt - Receive Sensistivity > > > When I compared the function of the Thunderbolt to my Z3816A, the > number of > tracked satellites was smaller on the Thunderbolt. However, the Signal > Level Mask is set to 4.0 on the Thunderbolt. After I reset it to > 1.0, they > tracked the same (and number of) satellites. > > This I did with TBoltMon under 'Setup', 'GPS Receiver' which takes you to > 'Receiver Configuration'. Change the Signal Level Mask (AMU) to > the desired > number then 'Set Receiver'. I also hit 'Save Segment' though I > do not know > if this is a required step. > > Joe _______________________________________________ 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.
