Thanks you both for your answers. I had another jump (positive this time, 24h after the first one) and the efc curve came back to its previous state, see : http://uppix.net/f/4/d/c5a277798ca58bb04b41481ece6e7.png.
The receiver is a 6 channels and it outputs two 10 MHz and one PPS. The antenna has noname and it is installed on a balcony, that's why it has a poor reception. Sure this is not perfect and I have to improve that. The log is running every 5 minutes and I didn't notice a holdover mode of the oscillator. (I've bought this GPSO to check the frequency of my 5334B for gates times of 60s and 100s. I know I can use the 10MHz of the GPSDO as Frequency Reference for the 5534B but I wanted to check its frequency first !) ________________________________ De : Volker Esper <[email protected]> À : [email protected] Envoyé le : Jeudi 28 février 2013 2h12 Objet : Re: [time-nuts] Z3805A/58503A time receiver : 2 questions If your unit is exactly like that on ebay 251226027893, it has a 10 MHz HP oscillator in a double oven, and it's absolutely sure that it's got a 6 channel receiver. I should have read before, sorry. I'm still not sure about your antenna, is it a Garmin? Well, it's most likely an active type, so what gain does it have? If you installed it on a roof top, it should see sufficient field strength. Then do that simple test: disconnect your antenna from the receiver unit and measure with a multimeter the voltage at the center pin of your N connecter antenna plug. It has to show 5 Volts, otherwise your antenna can't be working well. Volker Am 28.02.2013 01:26, schrieb Volker Esper: > > Hi Claude! > > Said says, you should see 6+ sats, I guess he means _at_least_ six. I'm > almost sure, you've got a 6 channel receiver, so you naturally cant't get > more than 6 sats at a time. > > There are some different models of the Z3805A out there, though they're all > named the same. I've got two units, one with an 8 channel and one with a 16 > channel receiver. My 8channel unit never receives more than 6 sats at a time, > never. So I'm shure, it's a 6 channel type... > > Maybe I should improve my antenna. But the same antenna provides enough > voltage to receive 12 to 14 sats at once with the 16 channel unit. On the > other hand, my 6/8 channel gizmo very rarely shows less than 6 sats, so, like > Said, I too think, that there is some space for improving your antenna. What > antenna do you have? > > One day, while using the 16 channel unit, I experienced the same hops as you > did. All time nuts told me that it had to be a crystal jump. I read about > such phenomenons and all I found was, that the jump in my receiver was too > big to fit to the idea of a crystal jump. Unfortunately my receiver gained > fun in jumping. Now I'm absolutely not sure what it is. Maybe it's a faulty > oscillator. Which one do you have built in? A 5 or a 10 MHz type? I've got a > 10 MHz HP and a 5 MHz Symmetricom oscillator. > > Cheers > > Volker > > > > Am 28.02.2013 00:17, schrieb Claude Fender: >> Hello, >> >> This is my first message here although I read this list for a few weeks. >> >> I bought a Z3805A/58503A frequency receiver and I didn't notice on the >>pictures that the model number was not written on the front panel. It's not >>important but is there a reason for that, if you know ? >> The item : http://cgi.ebay.fr/ws/eBayISAPI.dll?ViewItem&item=251226027893 >> >> >> I log some parameters of the receiver and today I notice a "gap" in the >> frequency. >> >> Picture : http://uppix.net/e/2/4/cf39ac772e5a69fc616f5cf30f208.png >> >> I have a Rubidium and I measure it's frequency with a 5334B counter locked >> to the GPS, and I can see the "gap" too : >> http://uppix.net/f/b/a/d86c2737ad135264e4a2b78e503d5.png >> measurements are with Gate Time of 10s, 60s and 100s, >> >> >> Do you know why this happens and how to prevent this behaviour ? >> >> Thanks for yours advices >> >> >> Claude >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> >> > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
