Someone earlier suggested a group buy of the Jackson Labs device. I
would be interested.
As for power supplies, my Nortel-TB is on an analog power supply,
deliberately. I do intend to put a scope on it, and see if it may be
contributing noise to the "issues" I see. (I'm wondering if it has
sufficient high frequency bypassing, and sufficient bulk capacitance to
deal with transients.) If it is, I will put it on battery, with the
analog supply as a charger...
More I think about it, the more I like the Jackson Labs devices.
Especially that they work with the GPSCON software (I think).
Jim
[email protected]
On 10/13/2013 5:47 AM, Robert Atkinson wrote:
Hi Frank,
I would NOT put the spare TB on a PC powersupply. Check out both TB's on the
bench using decent linear supplies. I don't like using PC supplies on critical
equipment. They are typically designed for a specific (high) load on one output
(5V on early ones 12V on more modern) to maintain regulation on the other
outputs. They are designed down to a cost and are often not great in terms of
suppressing spikes and surges. You are running a sub 15W TB on a 100-300W PSU.
And then there is the phase noise issue. Whay put a $30 PSU on $1000 Frequency
standard? A 3 line analog supply is easy to build at most 2 transformers two
bridge rectifiers a few capacitors and 3 78xx series regulators. Surplus (or
new) linear supplies are available, I use a HTAA-16W-AG by Power-One / Condor /
SL Power, like ebay items 300956540240 300956540566 ($15 each). Even new from
Mouser they are under $100. These high quality 100% duty cycle units are
slightly underated for start-up
current on the +12V rail, but with virtually no load on the -12V and low load
on the +5V it works fine. I'm in the UK on 50Hz mains so its worse case, the
PSU has 20% more capacity on 60Hz.
Bin the switcher!
Robert G8RPI.
________________________________
From: Frank Hughes <[email protected]>
To: "[email protected]" <[email protected]>
Sent: Saturday, 12 October 2013, 22:49
Subject: [time-nuts] Trimble replacement part-2
Hi,
Well, now I have determined that the TB
is actually bad and/or the goofy PC power brick is no longer making
correct volts.
http://i180.photobucket.com/albums/x257/fish1_07/am/trimble_trouble_zps70b440a7.png
I had one spare Trimble remaining to
replace it with.
Not sure what model the new one is, the
enclosure is red and a different form factor than the smaller anodized
Aluminum TB that failed.
New one works fine:
http://i180.photobucket.com/albums/x257/fish1_07/am/Trimble_replaced_10_12_2013_zps5042b487.png
Funny thing, my HP 59309A Clock had
stopped working, I thought it had a failure too, but when a stable
10Mhz signal appeared at the HP input, the ancient HP clock is back
to abby-normal again!
I should remember that the HP is also a "miners canary" for the TB...
In a state of delusion, I sent an EM to
Jackson Labs sales to see if they will sell a Fury
to an individual..can't imagine what
Quan-1 $$$ is going to be...
73
Frank
KJ4OLL
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