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

[Volker Esper]

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 -- time-nuts at 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 at febo.com
> To unsubscribe, go to 
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>
>