Probably not dead from the rollover issue as I can’t talk to the receiver via the serial port.
Fred Bray > On Jun 22, 2021, at 2:59 PM, Robert DiRosario <[email protected]> wrote: > > Does this effect All Z3801As? > I have one of these: > http://www.realhamradio.com/GPS_Frequency_Standard.htm > I picked up a power supply and antenna for it but haven't done anything with > it yet. > > > I have a HP Z3801A with a dead GPS receiver. > Is it dead because of Week-Roll over limits or something else? > > Robert > > >> On 06/21/2021 11:54 PM, Art Sepin wrote: >> Hi Fred, >> >> I apologize if the following smells overtly commercial; it's only intended >> to answer your questions and explain where we are in the process of >> producing GPS replacement products for legacy timing instruments. >> >> The 6 and 8 channel Motorola VP and 8 channel UT+ will not work as >> replacements. Those products have also reached their 1024 Week-Roll Over >> limits. The HP Z3801A and Z3805A products only respond to 6 channel commands >> and produce 6 channel reply messages. >> >> We have developed single-board clones for the Motorola VP and UT+ products, >> as drop-in replacements, that are lower in cost than Synergy's 2-board >> Adaptor Board products (Shooting for dropping to less than $190 if component >> prices don't go even higher!). The SSR-VP can plug into the HP Z3801A and >> Z3805A products. >> >> A different part number SSR-VP designed to drop into HP 58503A and an >> SSR-UT+, designed to drop into HP 58503B products, have also been completed >> but firmware for those have yet to be tested in actual instruments. With the >> proper firmware loads, the SSR Drop-In products should be candidates for >> upgrading many other legacy timing instruments. >> >> We had planned for the single board "Drop-In" products to be available near >> the end of 2020 but COVID-19 changed things for us. We are now planning a >> small production run to satisfy folks that have already been in touch with >> us but we need to complete our boot-loader for firmware updates first. With >> current work load, I'd estimate 90 - 120 days for HP Z3801A and Z3805A >> replacements. If you are interested we can put you on our list. >> >> Apologies for the quasi-commercial intrusion! >> >> Art >> >> >> -----Original Message----- >> From: Frederick Bray <[email protected]> >> Sent: Monday, June 21, 2021 7:21 PM >> To: [email protected] >> Subject: [time-nuts] Z3801A Receiver Replacement >> >> I have a HP Z3801A with a dead GPS receiver. I understand that it is >> possible to drop in an Oncore VP 8 channel receiver as a replacement -- not >> withstanding the fact that the Z3801A will only see six channels. >> >> I see that Motorola R5122U1154 8 channel receivers are available. Does >> anyone know whether this will function in the Z3801A? I'd like to get it >> working again. >> >> Thanks. >> >> Fred Bray, KE6CD >> >> >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] -- To unsubscribe send an >> email to [email protected] To unsubscribe, go to and follow the >> instructions there. >> _______________________________________________ >> time-nuts mailing list -- [email protected] -- To unsubscribe send an >> email to [email protected] >> To unsubscribe, go to and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- [email protected] -- To unsubscribe send an > email to [email protected] > To unsubscribe, go to and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] -- To unsubscribe send an email to [email protected] To unsubscribe, go to and follow the instructions there.
