Larry, Et al,
So long as the unit is a VP, the firmare date should not matter. The last firmware for the VP was v10.0 and was released in 1997, but all VP firmware will work with the HP's. As you can see from the TAC32 screenshot on Ebay the receiver being used was a 6 channel VP with v8.4 firmware. This was the "standard" configuration for the timing community back then. The straight MCX connector plugged directly into the motherboard connector instead of going to a cable. If these are coming from China I am guessing that they are decommisioning a lot of the old Lucent cell-sites. A note about the connector: Unless you have REALLY good soldering equipment and know how to use it, do not try to remove the connector. The ground plane in the board makes removal very difficult, especially in the B4xx and B8xx receivers. When I was working with these I normally just soldered a piece of RG174 on equivalent to the connector pins on the back side. If you do this you cannot have any service loop. The terminations to the connector pins must be as short as possible. Initial delays in acquisition are normally due to the receivers being inactive for long periods of time. If the oscillator characteristics change a lot during long periods of inactivity it can take over an hour for your initial fix. Once the new characteristics have been loaded into EEPROM your acq times should go back to normal. I wrote a paper on this many years ago when I was working at Synergy. Does anyone have a copy they would be willing to post? Randy Warner -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Sunday, June 22, 2008 9:52 AM To: time-nuts@febo.com Subject: [time-nuts] HP Z3801A Motorola Oncore VP receive... Mike et al: The first two Motorola Oncore-VP RX's I bought from that eBay seller were shipped by TNT courier service, about $30 cost, to my work address with about a 5 or 6 day delivery time. The seller provided a tracking number and I was able to follow the shipment's progress. It spent about two days hung up for custom's clearance. The seller's current eBay Oncore-VP listing uses Hong Kong's Air Mail Service, presumably handed off to USPS, at a much lower cost than TNT. On my second order for the Oncore-VP with this seller he didn't like my PO Box address that I use for Snail Mail and so I gave him my work address again. He also wanted my mobile phone number, but I gave my work phone number. I thought it a bit odd that he said that Hong Kong Air Mail Service didn't like PO boxes... I don't know why that would be since they aren't actually delivering it in the US. Anyway, I've still got two weeks to go before expecting delivery on the second order. Oddly, the seller said to my inquiry about tracking numbers that Hong Kong Air Mail Service does provide a tracking number -- but I've not been able to get it from the seller. So far he has a 100% feedback rating and he sure gave me good service on the first order. Further, he has software available for the receivers, but you need to ask for it per the instructions in his eBay listing. As always with eBay its "Caveat Emptor." He does have PP Buyer Protection so along with his 100% feedback rating I'm not too worried. I can tell you that I was greatly relieved when the two receivers fired up FB in my Z3801A! It did take awhile, even with a position initialization fix, for them to find the birds, then get current GPS time, etc. As an FYI, be aware (at least in my Z3801A), that the Z3801A's motherboard firmware doesn't like dates after Dec 31st, 2007. So if you try to initialize the Z3801A with a current date it may complain that its out of range. Maybe mine has old firmware and newer units won't complain? I dunno. It doesn't seem to be a problem -- just slows down the initial acquisition... Note that it doesn't complain about the current date when acquired by GPS sats -- just the input routine for PC provided dates complains. --Larry, W7JYJ _______________________________________________ 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.
