Any advice on troubleshooting the D channel
of a Systron 6153 counter?
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Hi
DAC clamped at -5 volts suggests that the TBolt has issues. First thing to
check is the -12 volt supply. If it's missing, the DAC will indicate -5 on the
screen and be sitting at 0 in real life. There are a couple other things in the
DAC circuit that can make it malfunction.
Bob
On Feb 9,
Hi
How old is the FRK? Does it look like it's been run without a heat sink for
very long? They tend to get flaky if run for a while (many months) without heat
sinking. There's nothing mysterious about it. The MTBF of the parts gets
noticeably worse as the unit heats up.
Bob
On Feb 9, 2013,
I wish I could remember! I used to service these and the 6053's in the 70's
at Systron-Donner's UK office.
I do know it will help if you make yourself an extender cable for the 14
(16?) pin dual in line red connector so you can get the input module on the
bench.
They usually suffered front end
Thanks for the reply.
I found that the 12v current is only 60ma. I suppose that means the Osc. heater
is not working. I'm not having much luck with this time nuts stuff. First the
FRK and now the thunderbolt. Guess I'll start looking for another one.
Garren
On Feb 9, 2013, at 6:01 AM, Bob
Hi
The +12 V supply at 60 ma likely means that the heater in the OCXO is not
working. If you have 60 ma on the -12 V supply, it's pulling about 10X more
than it should.
Bob
On Feb 9, 2013, at 10:01 AM, Garren Davis garren.da...@qlogic.com wrote:
Thanks for the reply.
I found that the 12v
Hello,
According to a Nortel specification document (Dual Voltage Global
Positioning System Timing Module (GPSTM) OEM General Specification
Dataset Name: GSBW50AA), this GPSDO is dual voltage and can be powered
either from -48 V or + 24 V systems. Mine is working from a 48 V power
supply but
Yes that was the way they used to send differential data most likely a
timecode signal, but also most likely not IRIG it would not have ever
needed a triax feed. Triax was quite expensive and fell out of favor about
1985.
How many of these things do you have??
Many of the old true-times like the
Hi
The most common way to design this gear is with an isolated supply. That
eliminates a bunch of odd line fault issues. The easy way to check this is with
an ohm meter. If it's isolated (and I'll bet it is) then polarity to ground
isn't an issue. Polarity between the supply input pins is
Open it up, you'll find a bridge rectifier as the first component on the
incoming power.
It's actually much easier to solder straight to the pins of that component,
rather than trying to bodge something together that would poke into the
backplane connector. :)
I know there's a TSIP command for
Found my problem with the FRK. R31 on the Osc board was burned and open. This
was caused by a shorted C16. Replaced and it is now locked. The lock voltage is
12.7v. Is this good or should it be lower?
Garren
On Feb 9, 2013, at 6:10 AM, Bob Camp li...@rtty.us wrote:
Hi
How old is the
Hi
Let it run for a couple of days. If it's still up at 11V, I'd tweak it down
a bit.
Bob
On Feb 9, 2013, at 12:38 PM, Garren Davis garren.da...@qlogic.com wrote:
Found my problem with the FRK. R31 on the Osc board was burned and open. This
was caused by a shorted C16. Replaced and it is
Since we're offering up faults for the FRK, I'll add one that I've
found: there's a CMOS 4060 oscillator that should go off at 8.128 kHz,
set by an adjust on test R. If this drifts off enough the lock will
never happen. It provides the FM frequency for the synth.
Dan
I'll add my own FRK-L failure story. I have a FRK that suddenly stopped
locking. The 10 MHz was there, but off frequency so much that I couldn't
adjust it to sweep over 10 MHz. It suddenly occurred to me that the crystal
oven housing should be hotter than just barely warm to the touch (it's
I believe there were variations of IRIG which sent the signal (un-modulated
or DC code) over a differential circuit, so Triax may have been used.
Rob K
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of paul swed
Sent: 09 February 2013
Greetings time-nuts,
I've finally gotten the software for my NTP server project to the point
where I'm comfortable shipping the boards I have now, so it's about time
to spin the next revision. If you could take a minute to look over the
feature list and let me know on- or off-list what you'd
Nate,
I have it already connected to a 48 V supply according to the vendor
instructions (fluke.l is a vendor with technical knowledge)and now I
removed the PCB from the case that I furnished and found that my unit
doesn´t have such bridge. Instead it have a quite elaborate reversal
power
Are the two diodes really back to back? I have use two in parallel to enhance
the time the diodes will conducting. Due to current hogging, the diodes will
effectively turn on one at a time.
-Original Message-
From: EB4APL eb4...@cembreros.jazztel.es
Sender: time-nuts-boun...@febo.com
Bob,
Thank you for your response. I already have it working with a 48 V
floating supply, as per the vendor info (Bob Mokia, fluke.l), but I
found in the referred documentation that maybe I could use a 24 V power
supply if I need it.
I bought only the PCB, not the original enclosure (too
Hi
I've never bothered to dig into the pps issues on the box. I have just been
using the RF output.
Bob
On Feb 9, 2013, at 8:22 PM, EB4APL eb4...@cembreros.jazztel.es wrote:
Bob,
Thank you for your response. I already have it working with a 48 V floating
supply, as per the vendor info
Maybe I didn't explained this quite well, I'm not good writing in English.
So I try again: In the negative input first there is a forward biased
diode, then a pair of fuses in parallel, and then the two diodes in
series connected to the positive in the back direction, so if the input
is
I looked into the 1PPS/2PPS issue on these Nortel units when I added support
for them into Lady Heather. They do not appear to respond to the commands for
changing to 1PPS. Also, they do not appear to save the oscillator
disciplining parameters into EEPROM (at least using any of the
Features?
1) Power the thing with power over Ethernet then you can remove the
coaxial power input. Also this would make it real easy to place the
server right at the antenna location. You would simply run cat-5 up
to the roof. The mount the antenna on top of a water proof box with
the server
On 02/09/2013 08:35 PM, Chris Albertson wrote:
Features?
1) Power the thing with power over Ethernet then you can remove the
coaxial power input. Also this would make it real easy to place the
server right at the antenna location. You would simply run cat-5 up
to the roof. The mount the
OK. I have the circuit now. Normally you would want to limit the reverse
condition to one diode drop. At two silicon diodes, the chips themselves would
start to turn on.
Odd, but I assume the designers had a reason.
-Original Message-
From: EB4APL eb4...@cembreros.jazztel.es
Hi Garren,
Congrats on your repair. Since the crystal control voltage is spec'd as
~1 to 12 Vdc, you're apparently holding onto lock by the narrowest of
margins. You definitely want to adjust the oscillator to bring that
voltage closer to the middle of it's range.
Ed
On 2/9/2013 11:38
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