[time-nuts] Z3805A/58503A time receiver : 2 questions

[Claude Fender]

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 <ailer2 at t-online.de>
À : time-nuts at febo.com 
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
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> 
> 
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