The minor down side is these resonant transformers acoustically hum and run
hot. On the plus side they do clean up any kind of noise on the line.
Rob, NC0B
Sent from my iPad
> On Jul 8, 2016, at 1:52 PM, Brooke Clarke wrote:
>
>
>
> Hi Bob:
>
> A resonate transformer may solve your probl
Having dealt with crystal filter procurement for over 40 years, there are lots
of mechanical issues as alluded to below. For crystals in the 5 to 10 MHz
range, the edges have to be beveled so the blank is convex. Cleanliness is very
important since it affects the plating of the electrodes. I w
I am a frequency nut, as opposed to a time nut. There may be some correlation
between the two subjects! 😄
I will be at Horror Arena this weekend, too. Would be fun to meet the gang.
Rob Sherwood
NC0B
Sent from my iPad
> On May 17, 2016, at 4:09 PM, Tom Holmes wrote:
>
>
>
I purchases NOS 3/8th inch hardline for my GPS antenna run. It had factory
installed N connectors on it, so all I needed was an N to TNC adapter on the
receiver end of my Trak GPSDO. Rob, NC0B.
Sent from my iPad
> On Apr 20, 2016, at 6:00 PM, "Bob Camp" wrote:
>
>
>
> Hi
>
> RG-6 Quad S
With the improvement in the top radios today, it is no longer possible to test
them with my 8662A / 8663A generators. I have had to move to 8642A / 8642B.
However for more general sig gen needs, I prefer the 8662A.
Rob
NC0B
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@f
If you 8662A has gone "bang" yet, replace the electrolytic on the three boards
is a good starting place. Once it goes bang you will have a to start replacing
solid-state devices.
Rob, NC0B
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of KA2WEU--- v
Oops, sorry I didn't realize you needed 150 ps rise time. Rob
Sent from my iPad
> On Apr 12, 2016, at 6:02 PM, "jimlux" wrote:
>
>
>
>> On 4/12/16 1:30 PM, BIll Ezell wrote:
>> (cross-posted to volt-nuts)
>> After paying only limited attention to this topic, I suddenly have a
>> need for a pu
I have both HP and Tektronix pulse generators. Neither are expensive and both
have been very reliable. Since I need some really slow rep rates for receiver
testing, I use my Tek 115 triggered with an HP 8904A synthesizer.
Rob, NC0B
Sent from my iPad
> On Apr 12, 2016, at 5:05 PM, "Logan Cum
N0QO fixed his display in one of his units.
I have forwarded your email to him.
If you forward me your direct e-mail address, I will pass it on.
Rob
NC0B
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Bert Kehren
via time-nuts
Sent: Friday, April 01,
Yes interested in what you are doing as to measuring phase noise. Rob, NC0B
Sent from my iPad
> On Mar 28, 2016, at 3:01 AM, "Oleg Skydan" wrote:
>
>
>
> Hi list,
>
> I am in a process of making a low noise frequency synthesizer for the 1st LO
> for my new DSP HF transceiver (http://neon.sky
My Efratom M-100 has been running for about 15 years 24/7.
I have no idea if that is typical.
It was purchased as NOS for $300.
Rob
NC0B
Sent from my iPad
> On Mar 27, 2016, at 9:11 AM, "Bob Camp" wrote:
>
>
>
> Hi
>
> The “typical life” numbers on the tubes in the various Cesium standards
: active directivity (dB) = isolation
>(dB) - gain (dB)
Rob
NC0B
Sent from my iPad
> On Mar 26, 2016, at 6:00 PM, "Bruce Griffiths"
> wrote:
>
>
>
>> On Saturday, March 26, 2016 09:30:30 PM Rob Sherwood. wrote:
>> You cannot add the directivity and gain.
s).
Rob
NC0B
Sent from my iPad
> On Mar 26, 2016, at 6:00 PM, "jimlux" wrote:
>
>
>
>> On 3/26/16 2:30 PM, Rob Sherwood. wrote:
>> You cannot add the directivity and gain. Doesn't work that way. Rob, NC0B.
>>
>
> Yeah, I kind of f
I forgot to add, after the step attenuators at the output of the combiner,
there is a 10 dB pad right at the back of the radio to provide a better return
loss to the combiner.
Rob, NC0B
Sent from my iPad
> On Mar 26, 2016, at 6:34 PM, "Rob Sherwood." wrote:
>
> I use
You cannot add the directivity and gain. Doesn't work that way. Rob, NC0B.
Sent from my iPad
> On Mar 26, 2016, at 2:00 PM, "jimlux" wrote:
>
>
>
> Consulting the time-nuts hive mind here..
>
> I'm looking for off the shelf connectorized amplifiers with very good reverse
> isolation for
I have been running an M100 for over 15 years. It was NOS when I purchased it
for $300. Runs 24x7, and just keeps chugging along.
Rob
NC0B
Sent from my iPad
> On Mar 11, 2016, at 10:01 AM, "time...@metachaos.net"
> wrote:
>
>
>
> Luciano,
>
> Why? Why the Efratom FRK or M100 over the Efr
r type (as in small PCB configuration) and
> powered (as in from your HP supply) oscillator for comparison?
>
> Not to beat the PS question to death, but does a battery supply change the
> outcome?
>
> Tom Holmes, N8ZM
>
> -Original Message-
> From: time-nuts
The part draws 600 mA during warm-up, and drops to around 230 to 200 mA when
stabilized.
Rob
NC0B
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Camp
Sent: Saturday, February 27, 2016 2:26 PM
To: Discussion of precise time and frequency measurement
I would have to make the measurement again with the HP supply off.
I have measured my Rubidium and my GPSDO and never seen anything like this
spectra of close-spaced spurious.
I'll send you some more data direct.
Rob
NC0B
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo
1960017 OCXO
Rob:
Are you sure you were running it with a clean power supply?
Any 60 Hz ripple on the supply could show up as AM/PM modulation.
You might want to try another 5V power supply before you give up on the
oscillator.
--- Graham
On Sat, Feb 27, 2016 at 11:35 AM, Rob Sherwood. wrote
t: Re: [time-nuts] Inside a CTS 1960017 OCXO
On 2/27/16 9:35 AM, Rob Sherwood. wrote:
> Hi Dan,
>
> I purchased two of these, and VA7OJ one. One of mine is defective, and the
> seller is going to replace it. What was disappointing was all the spurious
> at 60 Hz intervals relativel
Hi Dan,
I purchased two of these, and VA7OJ one. One of mine is defective, and the
seller is going to replace it. What was disappointing was all the spurious at
60 Hz intervals relatively close-in to the 10 MHz carrier. I suppose if all
one wants is a reasonably accurate 10 MHz, then they wo
When is some organization going to explain what happened in February for almost
two hours starting at 00:16 GMT? That subject has gone silent. Rob, NC0B
Sent from my iPad
> On Feb 25, 2016, at 2:03 AM, "Michael Perrett" wrote:
>
>
>
> I think the following might be relief to all the traffi
Any 3561A will work.
Rob
NC0B
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Charles
Steinmetz
Sent: Friday, February 12, 2016 12:28 PM
To: TimeNuts
Subject: [time-nuts] Seeking HP 3561A schematic diagrams
I'm helping a colleague resurrect a hard-l
Hi Dave,
Very good. Interesting you data is better than any typical data I could find
on the web which was -105 to -107 dBc/Hz at 10 kHz.
I need N0QO to get his 3048A up and running again so we can test some other
equipment.
What are you using for software?
At what frequency was this plot ma
Yes
Rob
NC0B
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of KA2WEU--- via
time-nuts
Sent: Saturday, January 16, 2016 6:01 PM
To: time-nuts@febo.com
Subject: Re: [time-nuts] Phase Noise Comparisons
Did my plot make it ? Ulrich
In a message date
I did some interpolation to compare the specs for phase noise of the 8660 the
way it was done then to the present method. I think it is going to be something
like -105 dBc/Hz to -110 dBc/Hz at 10 kHz offset at 14 MHz carrier frequency.
As a comparison, the 8662A is about -135 dBc/Hz and the 86
I did some interpolation to compare the specs for phase noise of the 8660 the
way it was done then to the present method. I think it is going to be something
like -105 dBc/Hz to -110 dBc/Hz at 10 kHz offset at 14 MHz carrier frequency.
As a comparison, the 8662A is about -135 dBc/Hz and the 864
f any generator.
> So I have several of them and then the synthesized gens like those
> mentioned.
>
> Hear that sucking sound?
> Its quicksand.
>
> Regards
> Paul
> WB8TSL
>
>> On Mon, Jan 11, 2016 at 3:54 PM, Rob Sherwood. wrote:
>>
>> It is more o
h.
>
>
>
> Bob
> KI2L
>
>> On Jan 11, 2016, at 09:47, Rob Sherwood. wrote:
>>
>> The HP 8647A may be the worst signal generator HP ever made. The 8656B
>> won't even go down low enough in level to make a noise floor measurement on
>> a m
mbo that tie together usually with a cable thats shipped
> with the units.
> Mine were brand spanking new. NOS.
> Good luck.
> To Ron o yes no shed or anything but the gear builds up. Darn thing is
> this stuff actually last longer then an iPhone99X due out tomorrow I am
> sure
Paul,
Your last paragraph was a hoot. A ham friend of mine recently rented a storage
shed to keep all his spare test equipment and parts units. Another ham friend
used to have four storage units to store all his "stuff". The disease is not
curable with either time or antibiotics.
My XYL w
g 8662A or 8642A synthesizers working is
not a piece of cake, so I would stay away from them unless you really need low
phase noise generators.
Good luck, and welcome to the hobby. I got my general in 1961, and it has been
a wonderful experience.
73, Rob Sherwood, NC0B
-Origin
The Perseus has a higher dynamic range than the Elad, if that matters. Rob,
NC0B
Sent from my iPad
> On Dec 19, 2015, at 1:30 PM, "Jörg Logemann" wrote:
>
>
>
> I could make a raw capture with a 14bit Perseus or 16bit Elad FDM-S2 and
> a good active receiving antenna, but the station I can
I initially had 50 feet of RG-58/U going to my GPS antenna. The loss was
likely around 12 dB. That cable eventually failed, and all I had was a 100
foot length of the same type of cable, and surprisingly the GPSDO still worked
ok. Recently I purchased a 35 foot length of 3/8th inch hardline w
This circuit can cope with the phase modulated time data and still provide a
frequency tracking signal for timebase adjustments? My Symmetrical WWVB
receiver is useless now. I had to go to GPSDO to validate the operation of my
two rubidiums. Rob, NC0B
Sent from my iPad
> On Nov 20, 2015,
A mentor of mine did airplane wiring during WW II. They initially used cable
lacing that was likely similar to your Collins method. What they found was a
machine gun bullet that penetrated the airframe caused more damage due to the
laced cable bundles. At some point the changed to just laying t
The EE department at the University of Colorado has an enlightened professor.
http://ecee.colorado.edu/faculty/popovic.html
Zoya required her students to not only get a ham license, but to build a Norcal
40A.
http://ecee.colorado.edu/~ecen2420/Files/NorCal40A_Manual.pdf
Most of the EE stu
The phase noise of the 3335A is typically much better than spec. Definitely
way better than a 3336C and has one of the worlds best laser-trimmed
attenuators. The 8642A and 8662A are better on phase noise, but much harder to
keep working. Anyone wanting a great signal generator should jump at th
right. Nope.
> That works for the old austron. But as I say serious thinking. There are
> some online tools that help. But it all gets old very fast.
> Regards
> Paul
> WB8TSL
>
>> On Sun, Nov 8, 2015 at 4:01 PM, Rob Sherwood. wrote:
>>
>> Why is this an
Why is this an issue?
Sent from my iPad
> On Nov 8, 2015, at 1:00 PM, "Brendan Giles" wrote:
>
>
>
> I was the project manager who was in charge of the NAVSTAR proteus GPS time
> and frequency unit.The two GPS rollover dates 1999/2018 were tested in
> product test plan. Also various dates
For multiple reasons I install serial cards in my Win7 desktops.
On the issue of the Win95 program, it may not run because the CPU is too fast.
Rob
NC0b
Sent from my iPad
> On Nov 4, 2015, at 7:02 PM, "paul swed" wrote:
>
>
>
> Steve
> My very small 10 cents.
> I am pretty sure win 95 had
I had a 5 MHz Sulzer in my lab for 20+ years, later adding a 2.5 MHz version.
Living in Denver made tracking WWVB very easy with three different comparators
over the years. I never managed to run them without a power interruption for
anything close to 4 years. I also obtained two with an odd-
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