[time-nuts] Z3805A/58503A time receiver : 2 questions
ailer2 at t-online.de
Wed Feb 27 20:12:30 EST 2013
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.
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.
> Am 28.02.2013 00:17, schrieb Claude Fender:
>> 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 :
>> 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 :
>> 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
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