Thanks guys. I've opened up my T bolt and noticed a SOT23 packaged part has the top blown off. The PPS BNC jack has U19 beside it. The next part is blown. Could someone take a closeup of the five parts around U19? The intact parts are marked: 5Dz 1AM and two 2Az parts.
Chris > On Aug 4, 2017, at 4:13 PM, Arthur Dent <golgarfrinc...@gmail.com> wrote: > > Actually that isn't my photo I linked to but one I just Googled. That is > probably a board revision most people don't have but it was the first one > I saw so I used it just to show that the GPS receiver is part of the > only circuit board and not another easily replaceable board like in some > other units. > > I just took a couple of photos of the later revision of the board for > anyone interested in seeing what might be fried. In the photo of the > top of the board the signal comes into a filter then to a 25db amp > marked AM50002 by Macom. Above the filter near the input is where the > decoupled +5VDC for the antenna is connected. If you are only reading > 0.5VDC, if your're lucky it might only be the amp is fried and that > could be an easy fix. If the 5VDC is ok with the amp input pin lifted, > it might be the only problem. I wouldn't bet on it though. The 4031 I > believe is a 1575.42 SAW filter > > The photo of the bottom of the receiver area shows a Sawtek filter and > other parts. At the bottom of the photo is C460, a feedthrough capacitor > and that might be where the receiver output is but where my Tbolts are > working I don't feel the need to look into whether you could connect > the output of a seperate GPS receiver there to make it work. > > I do have one Tbolt that has no oscillator. I brought the EFC and 10Mhz > connections to SMA connectors on the back so I can test other oscillators > or GPSDOs that don't have an easy way to monitor of graph the stability > of those units and using Lady Heather gives me a good way to compare the > graphs to ones I'm used to. You might possibly be able to replace the > built-in receiver but it might be easier to buy a working Thunderbolt. > > > http://i906.photobucket.com/albums/ac262/rjb1998/GPS%20top%201_zpslgxunnyw.jpg > > http://i906.photobucket.com/albums/ac262/rjb1998/GPS%20bottom%201_zpschvruppt.jpg > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.