Bruce, et al,
The 1pps output of an HP Z3801A and Trimble Thunderbolt is
only available (as far as I know) as a balanced ECL signal on the
25-pin connector, with dire warnings in the manuals about not
earthing either side of the ECL signals. Would you be able to advise
on a simple
See; http://www.realhamradio.com/sidecar.htm
John WA4WDL
- Original Message -
From: Peter Vince [EMAIL PROTECTED]
To: time-nuts@febo.com
Sent: Wednesday, March 26, 2008 9:29 AM
Subject: [time-nuts] Buffering the 1pps output from a Z3801A
Bruce, et al,
The 1pps output of an HP
Hi,
I'm finally getting around to trying to get a Spectracom 8170 WWVB
receiver doing something useful.
Unfortunately, I only have the unit, not the antenna/preamp.
Anyone built a replacement antenna for this? Could this be made to work with
a commercial ferrite core antenna, maybe something
From: Peter Vince [EMAIL PROTECTED]
Subject: [time-nuts] Buffering the 1pps output from a Z3801A
Date: Wed, 26 Mar 2008 13:29:36 +
Message-ID: [EMAIL PROTECTED]
Bruce, et al,
The 1pps output of an HP Z3801A and Trimble Thunderbolt is
only available (as far as I know) as a balanced
That's a cool box, but I took a more quick and dirty approach that has
served me well. There's a TTL level PPS inside the box, if I remember
correctly the part has quite a lot of drive and is fine for driving a
50-ohm cable. I needed a proper UTC PPS signal for a radio astronomy
project and
Here's how I added 1 pps and 10 MHz TTL outputs to my Z3801A:
http://www.febo.com/time-freq/gps/z3801a/mods/index.html
John
Peter Vince said the following on 03/26/2008 09:29 AM:
Bruce, et al,
The 1pps output of an HP Z3801A and Trimble Thunderbolt is
only available (as far as I
I've used my Spectracom WWVB receivers with an active LF antenna (the
AMRAD design) with very good results. At least here in Ohio, and after
the WWVB ERP upgrade, it doesn't seem to take much of a wet noodle to
get a good signal.
John
Scott Burris said the following on 03/26/2008 12:45 PM:
This is a half-baked idea I've thinking about for awhile. I wonder if
it might be possible to create a single measurement to combine allan
variance and phase noise in the same plot. Allan variance usually plots
tau in seconds on the x-axis. Instead, you might plot 1/s or frequency
on the
Peter
All comments so far relate only to the Z3801A. The Trimble Thunderbolt
has a TTL level 1 pps 10 uSec pulse output on a BNC connector intended
to be loaded with 50 ohms. AFAIK there is no ECL level pps output
available from the Thunderbolt via its 9 pin serial port connector.
It's
Peter Vince wrote:
Bruce, et al,
The 1pps output of an HP Z3801A and Trimble Thunderbolt is
only available (as far as I know) as a balanced ECL signal on the
25-pin connector, with dire warnings in the manuals about not
earthing either side of the ECL signals. Would you be able to
The Thunderbolt's output impedance on the PPS output is much less than 50
ohms, more like 5 ohms.
If you terminate the other end of the cable with a good 50 ohms termination,
you will be OK, even though it would be better to put a ~47 ohms series
resistor right at the TB output before driving the
Hello,
I'm wondering if anyone on the list has experience developing
shared applications with the uBlox TIM-LP GPS module.
For the curious, uBlox (www.u-blox.com) sells GPS chips and
modules. For a time they sold a TIM-LP module, which was
a GPS engine built around an ARM7 microprocessor core.
Hi,
I am in the process of setting up a Z3801A and would like to know what type of
cable I should use for a 50' run to an 58532A antenna.
Also I need to purchase one of the monitoring software programs for this
Z3801A, any suggestions.
jshank
___
I use 100 feet of LMR-400, which is fantastic, but overkill. It
probably loses about 6db for 100-feet at 1.5GHz. There are a lot of
online vendors that will sell you any length you want with N-type
connectors on both ends.
jeff
jshank wrote:
Hi,
I am in the process of setting up a Z3801A
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