[time-nuts] Tbolt
On 22/07/2021 08:30, time-nuts-requ...@lists.febo.com wrote: Message: 1 One more comment on the Vectron OCXO. My Tbolt shows a tuning voltage of +0.4 Volt and has 3.6 Hz per Volt. Assuming the OCXO was sold to Trimble with 0 V and my unit has at least 12 years on it (4380 days) aging is 3.29 E-11 per day. Not bad for an OCXO. Bert Kehren Hi. According to Lady Heather, My T'bolt sits with it's DAC at about 0.2V I always wonder about that. From the above comment, is the DAC output (and VCXO input I guess) bipolar, as in can range +- some amount from 0V? I've not seen any schematics for them, so in honesty haven't a clue what it's likely range is, good bad or indifferent. I did email TVB direct about the possibility of sourcing another one or two of them, but as he said (and I guessed) he was swamped with responses. I use mine mainly as a frequency reference, powered on 24/7 Regards to All. Dave G8KBV (In the UK as far as I can tell.) -- Created on and sent from a Unix like PC running and using free and open source software: ___ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there.
[time-nuts] Tbolt
One more comment on the Vectron OCXO. My Tbolt shows a tuning voltage of +0.4 Volt and has 3.6 Hz per Volt. Assuming the OCXO was sold to Trimble with 0 V and my unit has at least 12 years on it (4380 days) aging is 3.29 E-11 per day. Not bad for an OCXO. Bert Kehren ___ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there.
Re: [time-nuts] Tbolt and LOCK indicator - is it there?
Hi Not as far as anybody knows. Pretty much all GPSDO’s are targeted at being buried deep in an OEM system. There is no access to things like LED’s in that case. All monitoring is done by the serial / I2C / SPI / USB / Ethernet / whatever port. People have done cute little micro + display boards to add on to the TBolt. They do the serial monitoring and put up basic information on the display. Bob > On Feb 10, 2020, at 9:36 AM, Taka Kamiya via time-nuts > wrote: > > I have a few red labeled retail version of an older t-bolt. I'm wondering if > there is a signal somewhere that will indicate LOCK condition. I know I can > read the TSIP output and parse it, but all I need is just a simple LED. It's > not anywhere in its manual and I have not seen anyone mention it or even > discuss it. Has anyone poked around inside? Is there a secret test point > somewhere? > Thank you. > > --- > (Mr.) Taka Kamiya > KB4EMF / ex JF2DKG > ___ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] Tbolt and LOCK indicator - is it there?
I have a few red labeled retail version of an older t-bolt. I'm wondering if there is a signal somewhere that will indicate LOCK condition. I know I can read the TSIP output and parse it, but all I need is just a simple LED. It's not anywhere in its manual and I have not seen anyone mention it or even discuss it. Has anyone poked around inside? Is there a secret test point somewhere? Thank you. --- (Mr.) Taka Kamiya KB4EMF / ex JF2DKG ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
[time-nuts] TBolt damaged?
I had been running my Thunderbolt GPSDO and a TICC/T2 setup with an old WIN XP desktop computer until, a couple of weeks ago, a power fluctuation broke the PC. Now I am trying to figure out if the TB is also broken... It is built into a box with its own linear power supply, all voltages are good. I replaced the desktop with a WIN XP laptop and updated its Lady Heather to 5.0. When I open LH: -it performs the receiver autodetect in about 10 secs -it displays, briefly, “No Com1 serial port data seen”, then -opens the normal screen of information except the satellite data field is empty -at 30 seconds, LH stops. The fields all go blank except for the small amount of data that had been plotted in the plot field, and the words “Log: OFF” appear near the top cent of the screen. I then tried the TBoltmon.exe program: -all alarm indicators are green -the TX and RX indicators alternately are green at about 2/sec rate. -disconnecting the GPS antenna causes the antenna open and satellite tracking alarm indicators to change to yellow, BUT -the SV and AMU fields all show “?”. -I replaced the antenna with a new one, but there is no change in behavior. There is 5V on the antenna cable. -The latitude and longitude fields stay at fixed values (which correspond to my location) with no updating. An attempted self-survey did not start. -Rcvr mode: (7) Overdet Clock (time) -GPS Status: (0) doing fixes -Disciplining status: (0)Normal -Activity: (0)Phase locking -PPS field: values are below 10 ns. -10 MHz: –0.0x ppb. Is there something I have overlooked? Thank you for your time, John W2TX ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] Tbolt GPS for sale
Jerry, Please contact me off-list. I have questions, and might be very interested in your T'bolt. Dana k8yumdoo...@gmail.com (830) 896-6712 On Tue, Oct 30, 2018 at 5:05 PM Jerry wrote: > Subject: Tbolt GPS for sale > I am selling my Trimble 10 MHz Thunderbolt GPS disciplined frequency > standard. This is the older unit with the power connector on the top and > labeled AA002206.G1, Rev E, 3-2-05. It is mounted in an aluminum box > designed for disk drives that is about 5 in. wide X 7 in. high and 10 in. > deep. It has a +12, -12, 5 v power supply inside and also a fan running at > reduced speed mounted on the rear. AC Power in and the 10 MHz out, the > 1PPS out and the RS-232 connector are all mounted on the rear panel. There > is a 2 line display module mounted on the front that displays the time and > other info from the RS-232 output from the tbolt. The module was sold by a > company called Fluke.1 and runs firmware from KO0BB. The display module > needs some attention as it is somewhat dim and has the GPS Week Rollover > problem that confuses its date display. I am also including the outdoor > bullet antenna. Other than the display module everything works fine. It > runs both the Tboltmon and Lady Heather programs without errors and shows > all 8 satellites in the green. I am selling because it is a better 10 MHz > unit than I need with my ham gear and I am now running a couple of the > small Chinese GPS disciplined units. I am asking $250.00 shipped and > insured to the lower 48. I would prefer a Bank of America Cashiers check > or a Postal Money Order. I have pictures and if you give me a phone number > I will be happy to answer questions. I am in the Phoenix AZ area and if > you are close I would be happy to demo and of course lower the price if no > shipping is required > 73 Jerry > ___ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
