This unit is a part of the UK's Diplomatic Wireless Service's Piccolo HF RTTY
network.
I have acquired one of these am trying to get it working.
It accepts a 10MHz (or 1 or 5) reference the output can be set to any
frequency between 3MHz 29,999,900Hz, in 100Hz steps.
My unit is showing a
Unless your coax is unusually long it should only look like 50 ohms on the
leading and trailing edges of the pulse. A rough guide is 1nS per foot. So 10
ft of coax will look like 50 ohms for 10 nS. Of course the velocity factor of
the coax will lengthen that time by roughly 50% for most coax
What you have to file is the hard plastic connector block, not the shell of
the connector. There are four (IIRC) possible 'rotations or positions' of
the connector block/insert, labeled W, X, Y, and Z. I think the official
part number for the 5061A connector is (IIRC) DMS3106A18-22SW,
Ah, OK - the last time I had to do any connector abuse like that the keying
was a little different - there was a tab on the insert and a single keyway
cut into the shell - if you wanted to change the polarization, you had to
file another keyway in the shell and rotate the insert. It sounds like
Hi Mike
I haven't seen too many of these in the wild so can I assume this was the
unit recently sold on Ebay?
If so you got an excellent drive unit at a very good price, even if it
isn't working at the moment:-)
FCO standard equipment with these was the HCD-1519 1MHz frequency
At a recent hamfest, I picked up an interesting looking Efratom Made in
Germany MFS modular frequency standard system. It's basically a GPS
disciplined FRK Rubidium with XO fail-over and a whole bunch of RF and
PPS outputs, in a *very* heavy box.
I've had a chance to play with it a bit and
I stand corrected.
My 5089 definitely uses the same connector as the 5061A.
However, my 5085 uses a smaller connector, a DMS3106A10SL-3S.
http://www.galco.com/buy/DDK/DMS3106A10SL-3S
It uses a smaller clamp and strain relief, a DMS3057-4A, though I had to
remove the strain relief due to the
Something else occurred to me after I posted.
A 0.15 volt glitch could come from capacitive coupling if there was an
open in the PPS output of if it was an adjacent pin.
On Sat, 24 Nov 2012 16:52:50 -0800 (PST), Mark Spencer
mspencer12...@yahoo.ca wrote:
Thanks all for the responses.
I am
I'm beginning to set up in my new house and planning where all my various
antennas are going to go. Being a wood frame building, I was wondering if it
was sufficient to simply mount my Thunderbolt GPS antenna high in the attic. It
would be convenient as there is already a high quality CATV
Did you see that Symmetricom has the MFTS (Modular Frequency Timing
System) which is described as the replacement for the MFS. The manual
includes a warning not to interchange the modules between the two
systems. There may be some value in reviewing the MFTS manual to see if
there's anything
I do not know about the Thunderbolt in particular but some GPS
receivers are more sensitive than others and will work acceptably like
you describe. My house has similar construction and all of my GPS
receivers except maybe for my GPS18-5Hz hockey puck will operate in
the attic under the asphalt
Generally, it should work most of the time, which is probably good enough
to discipline your local standard.
Obviously, you want it above any foil backed insulation. Generally, near
the ridge would be good, as ridges don't get that much snow cover.
I've had a handhelg Garmin lock up OK in a lab
Message: 3
Date: Sat, 24 Nov 2012 11:10:02 -0600
From: Ed Palmer ed_pal...@sasktel.net
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] FE-5680A no 10MHz RF output?
Message-ID: 50b0ff6a.7030...@sasktel.net
Content-Type:
Dave,
Thanks for the link. That looks useful.
Joe Gray
W5JG
On Sat, Nov 24, 2012 at 4:39 PM, Dave G4FRE g4...@g4fre.com wrote:
I had a similar requirement a couple of years back. I ended up using a $10
VCXO, and a $20 Jupiter GPS. The circuit used was the one on page 12 of
Mark, Simon,
First, I can check the 1PPS on my Z3805A with a small white LED. The pulse time
is long enough to see in dark light conditions, and it verifies that the output
voltage is 2V, and the driver can supply some mA of current. Primitive but
works really well. Don't use a resistor on the
Thanks will do some checking and order the right connectors
Paul.
On Sun, Nov 25, 2012 at 11:40 AM, J. L. Trantham jlt...@att.net wrote:
I stand corrected.
My 5089 definitely uses the same connector as the 5061A.
However, my 5085 uses a smaller connector, a DMS3106A10SL-3S.
Am 25.11.2012 18:29, schrieb James Peroulas:
Message: 3
Date: Sat, 24 Nov 2012 11:10:02 -0600
From: Ed Palmered_pal...@sasktel.net
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] FE-5680A no 10MHz RF output?
gandal...@aol.com wrote:
I haven't seen too many of these in the wild so can I assume this
was the unit recently sold on Ebay?
It was indeed.
If so you got an excellent drive unit at a very good price, even if it
isn't working at the moment:-)
That's just what I thought. It's beautifully
n...@verizon.net said:
I'm beginning to set up in my new house and planning where all my various
antennas are going to go. Being a wood frame building, I was wondering if
it was sufficient to simply mount my Thunderbolt GPS antenna high in the
attic. It would be convenient as there is
My main GPS receiver used to see four to six satellites at a time when I
used an antenna near a window in my workshop in a singe story house. I moved
the antenna up into the attic near the peak, added 25 feet of TV cable, did
not add any amplification, and now my system acquires and tracks
Thanks, Ed. I wasn't aware of the MFTS. I'll look up those docs.
John
Ed Palmer said the following on 11/25/2012 12:12 PM:
Did you see that Symmetricom has the MFTS (Modular Frequency Timing
System) which is described as the replacement for the MFS. The manual
includes a warning not to
Depends on which end of the cable you are looking at. At the source end it is
2X the cable length. At the sink end only 1 cable length.
One to two uS should be more than enough time for all the reflections to die
out from cable losses alone. So even in a badly mismatched situation you should
Thanks all for the additional comments and suggestions, re the 1pps output
voltage on my Z3805's. I did confirm that my measurement technique gives
reasonable answers with other 1 pps signals. I also was able to observe an LED
dimly flashing when connected to the 1pps output of one of my
Look on Didier's site or TvB's and you should find the hack that turns
the 5680A into a variable output frequency device; there's a DDS with an
rs232 interface. All is not lost?
Don L
Volker Esper
Am 25.11.2012 18:29, schrieb James Peroulas:
Message: 3
Date: Sat, 24 Nov 2012 11:10:02 -0600
Suppose I have an A/D running at 1 MHz. The standard simple minded approach
is that it will work for any input signal with a bandwidth up to 1/2 MHz. We
usually think of that in the baseband, but it also works for, say 1.25 to
1.5 MHz. The input signal gets aliased down into the baseband.
HI
Going from memory (never a good idea…):
1) There is a manual adjust on the MXO to line the EFC up so it's in range to
lock.
2) The holdover / lock module is pretty simple, just a PLL running into a DAC.
Holdover = freeze the DAC.
3) They aren't the most reliable thing Efratom ever made….
Hi
The output spectrum is modified by the usual sin(x)/x based on the actual speed
of the DAC. It's like any digital signal, the rise time of the edge and the
spectrum are related to each other. Depending on exactly what sort of DAC
architecture you have it may work ok, or it may not. If some
On 11/25/12 4:30 PM, Hal Murray wrote:
Suppose I have an A/D running at 1 MHz. The standard simple minded approach
is that it will work for any input signal with a bandwidth up to 1/2 MHz. We
usually think of that in the baseband, but it also works for, say 1.25 to
1.5 MHz. The input signal
On 11/26/2012 01:30 AM, Hal Murray wrote:
Suppose I have an A/D running at 1 MHz. The standard simple minded approach
is that it will work for any input signal with a bandwidth up to 1/2 MHz. We
usually think of that in the baseband, but it also works for, say 1.25 to
1.5 MHz. The input
Hal,
Check out the Analog Devices website. Good info on DDS Dacs there.
You want to stay a bit away from the 1/2fs Nyquist limit in your DA. The reason
is the image coming down from your 1MHz clock.
If you output say 0.45MHz, you have an image at 0.55 MHz already (1MHz -
0.45MHz) so your
On 11/25/12 5:19 PM, Said Jackson wrote:
Hal,
Check out the Analog Devices website. Good info on DDS Dacs there.
You want to stay a bit away from the 1/2fs Nyquist limit in your DA. The reason
is the image coming down from your 1MHz clock.
If you output say 0.45MHz, you have an image at 0.55
On Sun, Nov 25, 2012 at 8:50 AM, Peter Gottlieb n...@verizon.net wrote:
I'm beginning to set up in my new house and planning where all my various
antennas are going to go. Being a wood frame building, I was wondering if
it was sufficient to simply mount my Thunderbolt GPS antenna high in the
There are ways to do it w/o drilling holes. Most all houses have vent
stacks for the plumbing, typically 3 or 4 inch cast iron or thick plastic.
You can clamp a couple of feet of pipe onto one of those and run the wire
to under an eve or through a gable end, adding a drip loop of course.
But, if
Another possible option is running the cable through the same hole in the roof
as the vent pipe. Frequently (for bath exhaust vents and such) there is a ~4-8
tin or aluminum shroud hat around the vent pipe, and in many cases, a gap
between the pipe and roofing material (the shroud opening
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