You can easily check the 5V by measuring at the open antenna plug. When
plugging the antenna, total current consumption should increase by about
10mA or so.
Am 11.11.2012 20:24, schrieb Doug Parker:
Hi John,
Thanks for the observation, with the same antenna plugged into my Z3801, I get
an SS of at least 90.
I'll place a preamp in line to see if that increases the SS on the 3805 , maybe
my problem is the GPS RX isn't well. Great point.
Of course, I'll watch out for the 5V power feed going up the coax for the
preamp in the antenna.
73s
Doug
G4DZU
________________________________
From: jmfranke<[email protected]>
To: Doug Parker<[email protected]>; [email protected]
Sent: Sunday, 11 November 2012, 19:04
Subject: Re: [time-nuts] Z3805 hold-Over
Your 21 ns for 1PPS and T1 does not look too bad, but the satellite received
signal strengths are too low. You should have at least four or five SS values
above 60-80. I always have at least three SS readings above 100. My Holdover
runs between 03 and 4 microseconds.
John WA4WDL
--------------------------------------------------
From: "Doug Parker"<[email protected]>
Sent: Sunday, November 11, 2012 1:36 PM
To:<[email protected]>
Subject: Re: [time-nuts] Z3805 hold-Over
Hi,
I've got a Z3805 from one of the Chineese sources and had problems with the HP
11801 oscillator which came with it. Even after a couple of weeks operartion it
was moving vast EFC voltages with the 'Holdover Uncertainty Predict' reaching a
lowest of 19uS.
So I tried the HP oscillator from my Z3801 in the Z3805 and the daily EFC
change is back to a resonable level, but after 5 days of settling down, the
'Holdeover Uncertainy Predict' has only got down to 10uS.and is holding about
that value.
Could some one please advise what figures they are getting. As there's
something sticking in my mind that the whole system should be lower than 6.3uS
after 3 days of locked operation. Or have I been dreaming.....
I have attached a JPG of my GPSCon graph, hope it helps
thanks& 73s
Doug
G4DZU
http://www.g4dzu.com/
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