I think I have a flaw in my understanding of this.
How can something like an SR620 measure the ADEV of an oscillator, if the
oscillator is of a similar or better than the reference fed into the SR620?
I see plots of ADEV for hydrogen masers, but I can't understand how this
can be measured from
On 1 Dec 2014 03:35, "paul swed" wrote:
>
> OK so it was not as hard as I thought getting all of teh screws out. The
> harder part is getting the actual board to slip out of the back.
> After getting to the bottom I found a locked 10 Mhz signal on U206 pin 1
> somewhat of a sine wave
Why do you n
On 30 November 2014 at 21:38, Bob Camp wrote:
> Hi
>
> You *know* what’s going to happen (it always does):
>
> You’ll get the LTE sold and the next day another project will pop up that it
> would be absolutely perfect for :)
>
> Bob
I don't know what the warranty situation would be on a used one
On 30 Nov 2014 16:17, "Bob Camp" wrote:
> > 1) Z3805A http://www.ebay.com/itm/251527236609
> > * 16 channels
> > * double oven
> > * dual outputs
> > * $499 + free carriage
> >
> > 2) Z3805A http://www.ebay.com/itm/271324714268
> >
> > * 8-Channels GPS Receive
> > * 6-Channel GPS Parallel trackin
On 30 November 2014 at 15:05, fjdvr...@zonnet.nl
[hp_agilent_equipment] wrote:
>
> Dave,
>
> I have had a 10811 in the 5342A. Not really a problem. However the thing is
> that while your counter is switched off the outside temp of the oven warms
> up, no surprise here, but when you switch it on,
I'm seriously giving consideration to getting an HP frequency
standard, and are looking at some from the Chinese seller "yixunhk" on
eBay. I would be interested in the views of people on the merits of
these 5 quite similar items as a GPS locked frequency standard. I'm
not really so bothered about p
On 27 November 2014 at 22:38, Dr. David Kirkby (Kirkby Microwave Ltd)
> wrote:
> It was very easy to fit the 10811A oven (HP 10811-60111) and get the
> oven working
> With the old TCXO in the frequency counter, the indicated frequency of
> the 10 GHz signal was about 48 kHz of
On 30 Nov 2014 05:55, "Orin Eman orin.e...@gmail.com
[hp_agilent_equipment]" wrote:
> Weren't you looking at the LTE Lite? It should do fine as long as you
can get the antenna well situated (not necessarily outdoors, some of us get
along with having it in an upper floor room). I have one on ord
On 27 November 2014 at 22:38, Dr. David Kirkby (Kirkby Microwave Ltd)
wrote:
> The HP 5342A has an optional oven oscillator. I just bought one of
> those counters, but mine has a TCXO and is about 50 kHz off at 10 GHz.
> I'm sure I can trim it closer than that, but if possible I
Dr David Kirkby
On 27 Nov 2014 23:27, "Brooke Clarke" wrote:
>
> Hi Dave:
>
> http://www.ebay.com/itm/171504585820
>
> http://www.prc68.com/I/LTE-LiteGPSDO.html
> Brooke Clarke
I was aware of them, and are still contemplating getting one, but the Fury
from Jac
On 27 November 2014 at 23:03, Bill Dailey wrote:
> Get the Fury. Plug and play.
Any idea of the price? I was thinking about that, and was going to ask
Said what the price is, but if you have a rough idea, I would be
interested to know. I might suggest he puts them on eBay too - I could
be tempte
dd a
power supply etc etc, it is not going to work out a lot cheaper than
buying a used OCXO device.
My mind is not made up about this. There are advantages and
disadvantages of both.
Dr. David Kirkby Ph.D CEng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Alt
On 27 November 2014 at 22:15, Brooke Clarke wrote:
> Hi David:
Hi Brooke
> If you look just to the right of the SR620 you will see a separate box that
> contains the PRS10.
Ah, I missed that!!!
I was thinking it fitted inside the SR620, but obviously not.
> The PRS10 can work as either a Rb G
The HP 5342A has an optional oven oscillator. I just bought one of
those counters, but mine has a TCXO and is about 50 kHz off at 10 GHz.
I'm sure I can trim it closer than that, but if possible I'd like to
stick an oven oscillator in it. Does anyone know what is involved? I
have at least one 10811
an Rb source in the SR620.
Dr. David Kirkby Ph.D CEng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, Essex, CM3 6DT, UK.
Registered in England and Wales, company number 08914892.
http://www.kirkbymicrowave.co.uk/
Tel: 07910 441670 / +44 7910 441670 (0900 to
On 27 Nov 2014 03:06, "Bob Camp" wrote:
>
> Hi
>
> You need a good antenna setup to get a good disciplined oscillator. The
bigger question is if you *need* the sort of “better” it gives you. If you
are running a simple TCXO based GPSDO, you will have a number of issues to
deal with compared to an
On 27 Nov 2014 01:14, "Chris Albertson" wrote:
> After this minimum you have th think about the probability of a strike.
If
> you live in Orlando Florida then it might be 100% and nearly zero in other
> places and then you ask what the radio equipment cost. I paid $18 for
my
> Motorola Encore G
On 26 November 2014 at 22:14, Chris Albertson wrote:
> You CAN (almost) lightening proof your system.
BUT if the almost is not quite enough, one could damage a lot of
expensive test kit.
> Remember that Ethernet is always
> gavalically isolated by transformers
I lost Ethernet ports on
* Sun Bl
phone. I
explain that is not acceptable.
MANAGER: So how do you suggest we earth it?
ME: I don't know how to do it. This is not my area of expertise, but I
know that what you are proposing, with 1 mm wire and poking the wire
into the ground with your fingers is not acceptable.
Dr. David K
On 25 November 2014 at 19:51, S. Jackson via time-nuts
wrote:
> Jim,
>
> please remember you need proper lightning protection if you put the antenna
> outside..
>
> bye,
> Said
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I am hoping to buy a SR620 from a seller who is not familiar with the
instrument, but who
1) Has knowledge of electronic test equipment in general.
2) Is willing to test the SR620 before an international shipment.
This puts me in a somewhat better position than typicall eBay sale with
comments
On 25 Nov 2014 23:10, "Bob Camp" wrote:
>
> Hi
>
> For a modern build, the PZT3904’s and PZT’s are a pretty good way to
go with this amp.
>
> For normal distribution to instruments, there’s really no need to do
anything this complex.
>
> Bob
I am also thinking about the construction of a dis
On 25 November 2014 at 19:42, Jim Miller wrote:
> I'm putting it in the recommended Hammond enclosure powered by a USB cable
> from my PC. I had originally planned to use the wall wart provided but I
> want to get status from the unit without hacking a window in the top to see
> the LEDs so I pla
On 24 November 2014 at 03:44, Said Jackson via time-nuts
wrote:
> On the 20MHz units there is already a strong buffer that can drive 50 Ohms
> terminations so adding a buffer in front of the coax connector on that
> version would have just added unnecessary phase and AM noise, parts count and
>
On 23 Nov 2014 16:25, "Tom Van Baak" wrote:
> For plots and photos showing performance with, and without, and with
insulation see:
>http://leapsecond.com/pages/LTE-Lite/
> The difference is dramatic, especially if you are used to working with
OCXO where this sort of effect does not occur.
Tom,
On 23 Nov 2014 17:49, "Poul-Henning Kamp" wrote:
>
>
> In message <
canx10hb0kdrnaayzgvm1gkduj7gklth0acdxczg894hxbus...@mail.gmail.com>
> , "Dr. David Kirkby (Kirkby Microwave Ltd)" writes:
>
> >He installs ground source
> >hea
On 23 Nov 2014 14:45, "Bob Camp" wrote:
>
> Hi
>
> If you have a basement in your house / building
I do not.
> —and —
> it’s dry and reasonably draft free (no garage doors opening up from time
to time)
My lab is a room which is part of the garage! Just about everything is
against me with this
I would like to make a unit with multiple 10 MHz 50 Ohm outputs to feed my
various bits of test equipment. I am thinking about some practical
considerations.
1) It would be great if there was a circuit published which can give 50 Ohn
output impedance from a 12-15 power supply, which
a) Doesn't
that in the
5370B manual.
Were these available with a Rb oscillator? I see a seller on eBay that he
has some Rb ones for $1500 extra, but I don't see it as an option on the
SRS web site.
Dr David Kirkby
Managing Director
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd,
On 21 Nov 2014 23:24, "Doug dmcgarr...@optonline.net
[hp_agilent_equipment]" wrote:
>
> On 11/21/2014 04:51 PM, 'Dr. David Kirkby (Kirkby Microwave Ltd)'
drkir...@gmail.com [hp_agilent_equipment] wrote:
> > I am looking for a microwave frequency counter and wo
I am looking for a microwave frequency counter and won an auction for an 18
GHz 5342A with the GPIB option today @ £200 (GBP). I have just paid for
that.
I also have the chance to get a 5352B 40 GHz counter for £500. That has
GPIB as standard.
In the short/medium term I don't see much use for a 4
ve
Dr. David Kirkby Ph.D CEng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, Essex, CM3 6DT, UK.
Registered in England and Wales, company number 08914892.
http://www.kirkbymicrowave.co.uk/
Tel: 07910 441670 / +44 7910 441670 (0900 to 2100 GMT only please)
On 20 Nov
On 18 Nov 2014 23:39, "Bob Camp" wrote:
>
> Hi
>
> Assuming that the number that looks like a date on the front panel is
indeed a date, the gizmo was designed about 3 months ago. The OCXO looks a
*lot* like a surplus Morion part. I think I’ll let somebody else go first
on doing all the ADEV and ph
On 6 November 2014 18:09, xaos wrote:
> I just cant figure out what it is ;)
>
> http://www.ebay.com/itm/HP-Agilent-5071A-Primary-Frequency-Standard-/191386439159?pt=LH_DefaultDomain_0&hash=item2c8f854df7
>
> One obvious question: Are the leftover parts worth anything close to the
> opening bid ?
On 3 November 2014 12:58, Bert Kehren via time-nuts wrote:
> Do not want to get off list subject but again have to disagree.
Lets's leave it there.
> Just checked my buys
> and on July 1st 2012 I bought a Wiltron 6740B 40 GHz excellent condition
> for $332 total cost.
That was good.
> You co
On 3 Nov 2014 02:59, "Bert Kehren via time-nuts" wrote:
>
> I respectfully disagree. Before getting totally submerged in time nuts
> issues I did extensive work on signal sources up to 40 GHz as a hobby. So
I
> have since the early 90's sweeper, synthesizer, power meter, mixer for
the HP
> 7
On 1 Nov 2014 16:50, "Jim Lux" wrote:
behind a scintillator)
>
> The 40 GHz stuff these days is not nearly as exotic as it used to be. The
challenge might be test equipment when you're debugging your 40 GHz
synthesis chain.
There's a fair amount of test equipment around to 40.0 GHz, but it is not
interested, although
I am not sure if those outside the UK can see it - you might need to
use a proxy server in the UK, since I have no idea if they block
access based on IP.
Also more on the BBC in the last 24 hours or so about this.
http://www.bbc.co.uk/news/science-environment-29758872
Dr. Da
On 30 Oct 2014 04:48, "Mark Sims" wrote:
>
> A friend of mine is looking for an ADC that can do 5 bits at 20-40
gigasamples/second... there is a timing related component to the project.
Any ideas of who makes a decent beastie? It needs to supply continuous
data so things like a fancy scope won't
I am sorry, but I can't follow the circuit diagram. It is not clear to me
what pins are joined, and what are not. Sometimes you have used a filled
circle to indicate lines are joined, and in another case there's a
semicircle to indicate that they are not. But on some of the others, I
don't know
On 17 Oct 2014 19:33, "S. Jackson via time-nuts" wrote:
>
>
> Hello Jim,
> let me answer through Time Nuts as this may interest other parties as
> well.
> Yes, using a fast flip flop to generate 10MHz out of the 20MHz TCXO 3.0V
> CMOS output from the LTE-Lite module will preserve the phase nois
On 8 Oct 2014 20:18, "paul swed" wrote:
>
> David the locking makes sense but the other numbers do not make sense.
> Combined best case would be +3 DBm also you say the current on the diodes
> goes down. More power for less power in is not adding up.
I went to a users meeting yesterday at Keysigh
On 11 Oct 2014 16:25, "Didier Juges" wrote:
> If I could get 1200W by combining two 300W amplifiers, I would now be
retired and very wealthy indeed.
>
> Unfortunately, there is no free lunch and unless somehow the Gun
oscillators were delivering more power when connected to the magic T (maybe
beca
On 9 Oct 2014 23:28, "Brooke Clarke" wrote:
>
> Hi Dave:
>
> The small size of the Ku-band TV dish and that it's surface is covered
with a "flat" type paint means there's little or no thermal heating of the
receiver or feed.
> There were cases with the early C-band TVRO systems where they did melt
On 9 Oct 2014 22:17, "Andrew Rodland" wrote:
>
> You pick up satellite TV with a parabolic dish that points at one spot
> in the sky where the geostationary satellite lives. A sun outage
> happens when the sun wanders into the focus and overloads the receiver
> with noise that drowns out the satel
On 8 Oct 2014 23:52, "Bob Camp" wrote:
>
> HI
>
> In the case of a magic Tee or a normal power splitter (both passive
devices), the current will not be limited by the combiner or the source.
With a proper combiner, the source will always be running into 50 ohms. You
will indeed get 6 db in the in
On 9 Oct 2014 00:26, "paul swed" wrote:
>
> Depends on your detector is it a Voltage or power. 3DBM or 6 DBV are the
> same.
> Paul
> WB8TSL
You are mistaken. A 3 dB increase in signal level is a 3 dB increase -
there's no need to say if power or voltage.
The formula for computing an increase i
On 8 Oct 2014 20:15, wrote:
>
> Hi,
>
> I came across this phenomena when transmitting with two 5KW transmitters
> via separate parabolic antennas to a satellite.
>
> If the phase of the TXs was correct the received signal at the satellite
> was 6db hotter!
I can explain that easy enough.
1) Two
On 8 Oct 2014 20:26, "Bob Camp" wrote:
>
> Hi
>
> It’s called injection locking. The two oscillators (or what ever) lock up
at exactly the same frequency and some arbitrary phase. Depending on the
amplitude and phase at the sum point, the result can be anything from +6 db
to zero power. Anything t
On 8 Oct 2014 20:18, "paul swed" wrote:
>
> David the locking makes sense but the other numbers do not make sense.
> Combined best case would be +3 DBm also you say the current on the diodes
> goes down. More power for less power in is not adding up.
I agree. However, the fact that the current go
ho just tried it says the current in
the diodes goes down about a mA when combined, so the input power to
the devices go down very slightly. Typically these things run at a few
hundred mA, so 1 mA is likely to be less than 1 %.
Dr. David Kirkby Ph.D CEng MIET
Kirkby Microwave Ltd
Registered office:
I see this on eBay
http://m.ebay.com/itm/220505574616
Note that the seller has misspelled the manufacturers name. Has anyone used
one? I have never even heard of this manufacturer - I guess it is Chinese.
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On 5 Oct 2014 03:26, "Tom Van Baak" wrote:
>
> Again, either one is fine for time nut use. One of these days I should do
a detailed performance comparison among a large set of both counters.
>
> /tvb
I was actually going to suggest that it would be really nice to see a
comparison of the various
On 4 October 2014 23:03, John Miles wrote:
>> I just stuck an offer on a SRS 620, which is sold as seen. I'll take a
>> chance it works if my offer is accepted.
>
> The 5370B is still the only high-performance counter that I own, personally.
> SR620s are fine as far as they go,
Is it me, or do
On 4 October 2014 13:24, Tom Van Baak wrote:
> Dave,
Hi Tom
> Thanks for the raw data. Attached is my plot. Your data looks ok to me.
Great
> If you're interested here are some random comments about your
> 8720D-1D5-oscillator-frequency.csv file:
Sure
> - Thanks for including the descriptio
On 4 October 2014 07:57, Magnus Danielson wrote:
>> This answers my original curiosity now - did I have an OCXO or TCXO.
>
>
> With that curve it is definitely an OCXO, and my guess is that it is an
> SC-cut, which matches starting +40 ppm high (if I recall things correctly).
> It is also typical
On 2 Oct 2014 07:10, "Magnus Danielson" wrote:
>
> David,
>
> The character of starting high/low and then stabilize some 5-30 min later
is typical of oven oscillators. Underdamped ovens have been seen before, I
have even seen one on the brink of oscillation.
Thank you. Do you know the likely caus
Further to my question the other day about what type of oscillator was
used in the HP 8720D VNA, fitted with the high stability oscillator
option (1D5), here is the frequency as the instrument is switched on,
after being powered off for 2-3 hours.
The oscillator appears to start too high in freque
Following on from my question the other day about the type of
oscillator in the HP 8720D VNA, I finally got around to setting this
up on the spectrum analyzer today. Luckily, some software I wrote back
in 2008 for a friends HP 7 system was easy to modify to grab the
save the frequency. So I can
On 30 Sep 2014 14:16, "Jim Lux" wrote:
>
> On 9/30/14, 12:44 AM, REEVES Paul wrote:
>>
>> David,
>>
>> Just a thought but have you tried Pasternack? They do 'custom' precision
cabling including 2.4mm connector options.
>>
>> regards,
>>
>> Paul, G8GJA
>>
> Rather than Pasternack, you might find
On 29 September 2014 22:45, Bob Camp wrote:
> Hi
>
> The information came from the HP data sheet on the oscillator. They provide
> it to the people who manufacture the oscillators for them.
>
> Bob
Can you share the data sheet?
Dave
> On Sep 29, 2014, at 1:14 PM, Dr.
On 30 Sep 2014 08:46, "REEVES Paul" wrote:
>
> David,
>
> Just a thought but have you tried Pasternack? They do 'custom' precision
cabling including 2.4mm connector options.
>
> regards,
>
> Paul, G8GJA
Hi Paul,
I don't know how good Pasternack are - I have seen some rather dubious
connectors
On 29 Sep 2014 20:06, "Hal Murray" wrote:
>
>
>drkir...@kirkbymicrowave.co.uksaid:
> > Unfortunately Keysight have now sold all the cables, but do have the
front
> > panel overlay which is arguably the most critical item.
>
> > Spending £500 on 5 cables and a front panel overly is more attractive
On 29 Sep 2014 17:58, "Bob Raker" wrote:
>
> It is a low end OCXO - uses AT cut crystal. 15V @ 300 mA. Warm-up time
is
> 6 minutes max for .1 ppm. Other specs as indicated in previous emails.
>
> Has NO EFC.
Where do you get this information from?
I think I am going to take the covers off thi
On 28 Sep 2014 13:19, "Jim Sanford" wrote:
>
> Dave:
> Check out w1ghz.org.
>
> Paul has some designs (and boards) that can lock different oscillators to
a reference. He uses a long time constant to manage phase noise.
I looked into that but it is an expensive way. PCBs are $6 each!!! I am
going
On 29 Sep 2014 00:27, "Tom Van Baak" wrote:
> The next clue is the attached photo found at:
>
> "Agilent 08753-60158 Opt. 1D5 for 8753D/E/ES"
>
> http://www.ebay.com/itm/151256172424
Note that is for an 8753 (3/6 GHz) series VNA, not the 8719/20/22, which
are 13.5, 20 and 40 GHz respectively.
I
On 29 Sep 2014 02:05, "Tom Miller" wrote:
>
> Dave, do you have access to a good counter?
Not really.
I have an HP 7 modular measurement system, which has all the bits for
a 22 GHz spectrum analyzer. The analyzer has a frequency counter mode, but
I have not written any software to grab data
On 28 September 2014 19:37, Tom Miller wrote:
> Looks like I am having crow for lunch today. I did find the 1D5
> installation instructions and at first it looked like the standard OCXO
> package used in many HP instruments. But some closer reading shows that it
> may in fact be a 50 MHz TCXO.
>
>
On 28 Sep 2014 11:37, "Poul-Henning Kamp" wrote:
> There's a pretty excellent 10->200 MHz multiplier in your HP5370.
>
> Consider using it for an experiment to see if your idea even works...
>
> --
> Poul-Henning Kamp
This response on the Keysight forum by a VNA guru
http://www.keysight.com/owc_
On 28 September 2014 15:52, David McGaw wrote:
> The temperature stability and warm-up time imply an OCXO. 0.05ppm over
> 0-55C is at the limit of what can be achieved with a TCXO but they do not
> have a long warm-up time. It would be expensive and only would be used if
> warm-up time was criti
On 28 September 2014 12:40, Bill Dailey wrote:
> I use this for my qs1r (125MHz) and to discipline a sound card (24.576MHz).
>
> http://www.valontechnology.com/5007%20synthesizer.html
> http://www.valontechnology.com/3008%20divider.html
>
> I actually have one 5007 sandwiched between two 3008's wi
On 28 September 2014 13:14, Jim Sanford wrote:
> Dave:
> Check out w1ghz.org.
> Paul has some designs (and boards) that can lock different oscillators to a
> reference. He uses a long time constant to manage phase noise.
Thanks, I have dropped him an email. He has one at 200 MHz, which is
what I
On 28 September 2014 14:49, dlewis wrote:
> If you can use 90 MHz, .
No, I would really like to keep it an integer multiple of 100 MHz.
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On 28 Sep 2014 11:37, "Poul-Henning Kamp" wrote:
> There's a pretty excellent 10->200 MHz multiplier in your HP5370.
>
> Consider using it for an experiment to see if your idea even works...
I know longer have that - I sold it to someone on this list, then later
regretted selling it!
But I do ha
I am looking for a quick & simple way to create a frequency of 200 MHz from
10 MHz. Actually 100, 200, 300 or 400 MHz would all work, but 200 MHz
would be my preference.
The input will be around 0 to +10 dBm and the output needs to be about +13
dBm.
I did think of a x5 & x4 frequency multiplier
On 28 Sep 2014 03:11, "Alexander Pummer" wrote:
>
> that is most likelly a TXCO, what is in the user's manual about warm up
time?
Two people responded - one says a OCXO and the other an TCXO!!
The warmup time is I think an hour, but clearly that is not the time for
an oven to warm up.
If it wa
The 10 MHz high stability oscillator (option 1D5) in my HP 8720D VNA
has the following specs
Stability
0 to 55 deg C, +-/ 0.05 ppm
Aging per year +/- 0.5 ppm
What sort of oscillator is this likely to be - TCXO or OCXO?
Dr. David Kirkby Ph.D CEng MIET
Kirkby Microwave Ltd
Registered office
On 26 September 2014 13:52, Azelio Boriani wrote:
> From gpsinformation.net:
>
> In the frequency allocation filing the L1 C/A power is listed as 25.6
> Watts. The Antenna gain is listed at 13 dBi. Thus, based on the
> frequency allocation filing, the power would be about 500 Watts (27
> dBW).
On 26 Sep 2014 13:01, "Andrea Baldoni" wrote:
>
> On Fri, Sep 26, 2014 at 10:07:56AM +0100, Dr. David Kirkby (Kirkby
Microwave Ltd) wrote:
>
> > I don't understand the units of signal strength
> >
> > "The L1 carrier is spread over a 2 MHz bandwidth
On 17 Sep 2014 23:38, "Peter Putnam" wrote:
>
> Greetings,
>
> The link below describes a homemade GPS receiver.
>
> It is presented in a detailed and elegant manner that is certain to
appeal to this reflector's subscribers.
>
> Peter
>
>
> http://www.aholme.co.uk/GPS/Main.htm
I don't understand
OOPS! CORRECTION.
I don't know the PIC but I would have thought chips for audio would be
optimised for low noise far MOOR than one for driving motors.
Ears are more sensitive to a bit of noise than motors.
I assume I have misunderstood you.
Dave
___
t
ght chips for audio would be
optimised for low noise far less than one for driving motors.
Dr David Kirkby
Managing Director
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Chelmsford, Essex, CM3
6DT, United Kingdom
Registered in England and Wales as company number 08914892
http://ww
On 13 Sep 2014 04:39, "David McGaw" wrote:
>
> The battery probably was going weak and the oscillator coming out of full
control by the crystal. The tuning-fork crystal used in RTCs is not as
high-Q as a MHz crystal. I have noticed clocks using these can go quite
slow at low voltage. The crysta
On 13 Sep 2014 01:23, "Alexander Pummer" wrote:
>
> just open the box, look for the wires which going to the magnet which
drives the minute hand and measure the period time -- not the frequency, it
is to low
> yes analog quarz clock slows down as the battery get old, you will be
surprised, that t
Dr David Kirkby
Managing Director
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Chelmsford, Essex, CM3
6DT, United Kingdom
Registered in England and Wales as company number 08914892
http://www.kirkbymicrowave.co.uk/
Tel 07910 441670 / +44 7910 441670 (0900-2100 GMT)
On 12
On 12 Sep 2014 03:35, "Alex Pummer" wrote:
>
> No that is to much, except if you overdrive it and you are so lucky that
after it broke it is still working on a different frequency, but I would
suggest check your frequency counter too, because 3% off of a clock
frequency wold make the clock almost
On 26 Nov 2012 14:12, "David Kirkby" wrote:
>
> I've got an HP 8720D VNA. This has been out of support from Agilent
> for 8 years, so its getting on a bit. There's a clock in the
> instrument which keeps the date and time. This is losing about 1 day
> per month
On 10 Sep 2014 17:36, "Brian Lloyd" wrote:
>
> On Wed, Sep 10, 2014 at 9:42 AM, Azelio Boriani
> wrote:
> I skimmed through the patent but did not read it in
> detail. There may be some nugget in there that represents something new
but
> nothing jumped out at me.
Maybe that is the trick to make
On 10 Aug 2014 05:39, "Jim Lux" wrote:
> (but, I gotta say that a lot of the patents that get published in the
back of things like IEEE Ant and Prop Magazine seem, to me, to be pretty
obvious..)
I have not looked at patents recently, but most I have looked in the past
are fairly obvious to som
On 2 Jul 2014 07:55, "Magnus Danielson" wrote:
> The authoritative source is BIPM:
> http://www.bipm.org/en/practical_info/useful_links/nmi.html
Thank you. That is a useful resource to know of.
> which points to:
> http://www.measurement.gov.au/Pages/default.aspx
Thanks, that is probably what
re superior, but I'd
like to find a reference.
2) Who in Australia would be best at measuring the reflection
coefficient of a 50 Ohm termination?
--
Dr. David Kirkby G8WRB
http://www.vnacalibration.co.uk/
Economical & accurate VNA calibration kits.
Coefficients available for HP, Agilen
On 3 June 2014 19:22, paul swed wrote:
> Great comment by Dave on the fact that someone
> will give out some of the old options. Now I have to figure out what on
> earth that might actually mean.
> Regards
> Paul
> WB8TSL
There are a few options for those VNAs. These are basically generic,
but ch
On 3 June 2014 16:54, Scott McGrath wrote:
> Where are the software options for the 8753 coming from. Agilent will not
> even talk about a VNA that's older than the PNA series
This has been discussed on the HP/Agilent mailing list. Basically a
couple of people that work at Agilent, one of whom
On 2 Jun 2014 19:07, "Alexander Pummer" wrote:
>
> I do not wanted to discourage any body, but building the hardware of a
network analyzer is not a simple task, and requires substantial
instrumentation, software could solve hardware problems to certain limit
only
> 73
> KJ6UHN
VERY TRUE
The larg
On 2 Jun 2014 18:14, "Thomas S. Knutsen" wrote:
>
> The design of an VNA is an interesting thing. It requires quite high focus
> on good RF practices and screening.
>
> In the range 0-3GHz there is no low cost devices avaible, not counting the
> copper mountain tech boxes ( http://www.coppermounta
On 2 Jun 2014 17:33, "Ed Palmer" wrote:
>
> There's a DIY project to build a spectrum analyzer at
http://scottyspectrumanalyzer.com . Since it's modular, one version of the
project is to add a couple of modules that change it into a network
analyzer.
But I think a VNA is an order of magnitude mo
On 2 Jun 2014 15:50, "Attila Kinali" wrote:
>
> I recently got introduced into the usefullness of a VNA. But these
> things are horribly expensive for home use, even if bought from ebay
> (before you say anything, remember i live in europe, where every
> boat anchor hast to travel a long way). But
On 2 Jun 2014 10:03, "Tom Van Baak" wrote:
> Now I have never had a problem with reception in the terminal, walkway,
or even while seated inside a plane. I figured the aluminum frame of the
plane was thin enough that photons at cell, GPS, and gamma frequencies
easily pass through the outer shell
On 28 May 2014 14:06, "Tom Holmes" wrote:
>
> Which begs the question: just where the heck, exactly, is the center of
the
> Earth given that it is in the 'middle' of a molten and dynamic core.
I always thought that the centre was molten. There was something on the TV
in the UK a couple of weeks a
On 20 May 2014 21:19, paul swed wrote:
> Boy this is really off target I guess.
To get it back on topic, if one of the options was going to be "time"
related, what would it be?
Dave
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