Have a TS2100 I am installing a Heol Design GPS board in. There is an extra board between the Trimble board antenna connector  and the antenna cable. P/N is 172461A, has a pair of orange & white wires going to a three pin header on the far side of the main board. Any ideas? Martin

perhaps for a bias tee to power the remote antenna, at a different voltage than the Trimble board? On Saturday, June 24, 2023, Martin Flynn via time-nuts < time-nuts@lists.febo.com> wrote: > Have a TS2100 I am installing a Heol Design GPS board in. > > There is an extra board between the Trimble board antenna connector and > the antenna cable. > > P/N is 172461A, has a pair of orange & white wires going to a three pin > header on the far side of the main board. > > Any ideas? > > Martin > > > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-leave@lists.febo.com -- --Andrew -------------------------------- Andrew E. Kalman, Ph.D.

Hi; I believe some of the Symmetricom GPS used 12VDC to power their antennas so that would be logical. Most 5VDC GPS Antenna LNA's will accept the 12VDC. Cheers; Tom Knox SR Test and Measurement Engineer Phoenix Research 4870 Meredith Way Apt 102 Boulder, Co 80303 Formerly of: 357 Fox Lane Superior Co 80027 303-554-0307 actast@hotmail.com https://www.thedenverchannel.com/news/marshall-fire/superior-man-moving-forward-after-losing-dream-research-lab-during-marshall-fire "Peace is not the absence of violence, but the presence of Justice" Both MLK and Albert Einstein ________________________________ From: Andrew Kalman via time-nuts <time-nuts@lists.febo.com> Sent: Sunday, June 25, 2023 11:24 AM To: Discussion of precise time and frequency measurement <time-nuts@lists.febo.com> Cc: Andrew Kalman <aekalman@gmail.com> Subject: [time-nuts] Re: Mystery board in a TS2100 perhaps for a bias tee to power the remote antenna, at a different voltage than the Trimble board? On Saturday, June 24, 2023, Martin Flynn via time-nuts < time-nuts@lists.febo.com> wrote: > Have a TS2100 I am installing a Heol Design GPS board in. > > There is an extra board between the Trimble board antenna connector and > the antenna cable. > > P/N is 172461A, has a pair of orange & white wires going to a three pin > header on the far side of the main board. > > Any ideas? > > Martin > > > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-leave@lists.febo.com -- --Andrew -------------------------------- Andrew E. Kalman, Ph.D. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send an email to time-nuts-leave@lists.febo.com