Re: [time-nuts] Trimble Thunderbolt - Receive Sensistivity

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 t

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

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 unde

Re: [time-nuts] Trimble Thunderbolt - Receive Sensistivity

My problem is I am using a Motorola antenna with 24 db of gain, looking at Trimble they expect 35 db gain. I am in an apartment and the management let me put up a GPS antenna on the edge of the roof. I came down with 20 feet of RG6 and then jumped into RG59 coax to run inside the apartment. I

Re: [time-nuts] Re Phil's Fluke Monotronics equipment

Dave and Phil, I have one of those comparators as well. Mine is marked "FLUKE Montronics" model 100 ser # 196. It has vertical, horizontal quadrature outputs and a delta F output. The range of measurement is from 10^-6 to 10^-9. This one works as far as I can tell but, unfortunately, I have

[time-nuts] Re Phil's Fluke Monotronics equipment

Phil, I'm a new subscriber to this forum. I saw that you have a manual for the Montronics 103A comparator. I have one of these and could use a manual for it. It's a bit flaky with a standard freq of 3 MHz in that the phase meter wanders a *LOT* more than it should when compared with a 1 MHz r

Re: [time-nuts] Trimble Thunderbolt - Receive Sensistivity

Both of the thunderbolts I have usually see 7-8 satellites, SNRs from 35-50, antenna is on the roof with about 150ft of LMR-400 and going through 2 4-port distribution splitter/amps. I use the belden equiv of LMR-195 for all connections between the receivers and the amps. Both thunderbolts seem t

Re: [time-nuts] Trimble Thunderbolt - Receive Sensistivity

I also had the same feeling until I changed the position of the antenna from eastern side of the building to the southern. At least two usable svs more on the average... P. Dukic At 19:05 28.8.2008, you wrote: >The Thunderbolt does not seem to be the most sensitive receiver >around, but

Re: [time-nuts] PTS Meter

In a message dated 28/08/2008 18:12:45 GMT Daylight Time, [EMAIL PROTECTED] writes: Just picked up a PTS-160 that seems to be working fine except for the front panel meter. Appears to have either an open coil or a open connection at a pivot point. No DC continuity through the meter. Anyb

[time-nuts] E-5680A C-field trimer ??

Reposted with a proper title: I am only really familiar with the 5650A/5680A with the AD9830A DDS chip that responds to the ASCII "S/E/F" commands. This manual talks about a 5680A with a different set of commands: http://tonga.globat.com/~ko4bb.com/Manuals/5)_GPS_Timing/FE5680A_Opt2_TechManRe

Re: [time-nuts] time-nuts Digest, Vol 49, Issue 83

I am only really familiar with the 5650A/5680A with the AD9830A DDS chip that responds to the ASCII "S/E/F" commands. This manual talks about a 5680A with a different set of commands: http://tonga.globat.com/~ko4bb.com/Manuals/5)_GPS_Timing/FE5680A_Opt2_TechManRevised.doc Hopefully it will le

[time-nuts] PTS Meter

Hi Gang, Just picked up a PTS-160 that seems to be working fine except for the front panel meter. Appears to have either an open coil or a open connection at a pivot point. No DC continuity through the meter. Anybody have a dead synthesizer that might entertain a deal on the meter? Thanks, Ha

[time-nuts] Trimble Thunderbolt - Receive Sensistivity

The Thunderbolt does not seem to be the most sensitive receiver around, but it does not seem particularly bad. Sensitivity in a time receiver can be a bad thing... more sensitivity tends to make it more susceptible to multipath, etc. These things were meant to be mounted on cell towers, etc

[time-nuts] Nice LORAN-book

Dear All, Maybe it was mentioned before, but by accident I found (rediscovered?) this book: "New potential of low-frequency radionavigation in the 21st century" It was a PhD-thesis written (in 2006) on the university I'm working for. The book can be downloaded from this site: http://www.vh

Re: [time-nuts] TBolt question

Hi, Is there a definitive webpage which lists the Thunderbolt offer from TAPR? I cannot find anything via google on the TAPR site. Thanks -- Sanjeev Gupta +65 98551208 On Sun, Aug 24, 2008 at 11:48 AM, <[EMAIL PROTECTED]> wrote: > Hi, > > Just received my TBolt from the TAPR buy and have a q