Re: [time-nuts] Temp/Humidity control systems?

Looking at it as a problem in thermodynamics, which has equations for the flow and storage of heat, it might have a simple solution. If you can have your equipment closet hotter than the basement will ever be, we can use basement air for cooling the closet. The basement air can be held to about

Re: [time-nuts] Temp/Humidity control systems?

On 10/27/2016 6:43 AM, Ron Bean wrote: BTW some of us are more sensitive to humidity than others. I can't tell you the RH of a room, but I can tell you when it's too dry for comfort. I want it as close to 50% as I can get it without growing mold on the walls. Some "experts" claim that 30% is

Re: [time-nuts] Has anybody checked this? GPSDO in kit

e) Which is the antenna signal level (dBm) that this unit require to operate properly?>> The antenna you referenced should be fine. I would hazard to guess that antennas a re a whole separate topic. The gain should be fine. What you need is a clear unobstructed view of the sky. I am pretty

Re: [time-nuts] Has anybody checked this? GPSDO in kit

Any pole mount outdoor antenna with a gain in the 20 to 30 db range should be fine with any of these units. Cable loss can be an issue if it is getting the net gain down below 10 db (antenna gain - cable loss). The frequency is 1.5 GHz Perfect, mine should have 3.5 + 26db. I will start with few

[time-nuts] Changing COM Port

Did you change it to "Program Files" or "Program Filed". Also try starting Heather with a /? command line option. This will bring up the command line help info. Scroll down to the bottom of the help info. It will have a line that says something like "Put heather.cfg" into directory...

Re: [time-nuts] Changing COM Port

Richard, Try this: "C:\Program Files\Heather\heather.exe" /3 Note that the string "C:\Program Files\Heather\heather.exe" is enclosed with quotes and the /3 is outside of the quotes. Ken WA2LBI On Sun, Oct 30, 2016 at 7:04 PM, Richard Mogford wrote: > Thanks for the

[time-nuts] Changing COM Port

Thanks for the information on changing the COM port in Lady Heather’s shortcut. I added “/3” as instructed to get this: "C:\Program Files\Heather\heather.exe /3” However, when I press OK, I get a message that “The name "C:\Program Filed\”Heather\heather.exe /3” specified in the Target box

[time-nuts] Change COM Port in Lady Heather

If you are using the Linux / macOS version of Lady Heather the com port selection rules are a bit different. You specify a com port number 1 greater than the operating system device number. This horrible kludge is due to the fact that Linux starts numbering com ports from 0 and Windows starts

Re: [time-nuts] theoretical Allan Variance question

Hi Stu, On 10/30/2016 01:38 AM, Stewart Cobb wrote: What's the expected value of ADEV at tau = 1 s for time-interval measurements quantized at 1 ns? Reasonable question. This question can probably be answered from pure theory (by someone more mathematical than me), but it arises from a very

[time-nuts] Looking for a low power very low noise DC/DC converter (100 - 200 ma 10VDC or 15VDC)

Not entirely on subject since this is for a transceiver, but figured this would be the group most likely to generate a useful answer. I happen to like the older Icom IC-271H and 471H, I have a pair of each where one is currently the control and one is the in-progress unit. All the normal stuff

Re: [time-nuts] our favorite topics

In a message dated 10/30/2016 6:07:56 P.M. Eastern Daylight Time, davidwh...@gmail.com writes: That is always the danger when using parts for characteristics not guaranteed in the specifications. YES Sometimes a process just becomes obsolete necessitation new parts to be fabricated on a

Re: [time-nuts] our favorite topics

That is always the danger when using parts for characteristics not guaranteed in the specifications. Sometimes a process just becomes obsolete necessitation new parts to be fabricated on a new process. Or a process may have enough variation that some lots or parts meet unguaranteed

Re: [time-nuts] Temp/Humidity control systems?

On Sun, 30 Oct 2016 20:38:49 + "Dr. David Kirkby (Kirkby Microwave Ltd)" wrote: > I was just reading the Keysight forum on VNAs. Someone was having issues > measuring a bit of waveguide 80 m long. Dr. Joel Dunsmore pointed out that > humidity has an effect in

Re: [time-nuts] Change COM Port in Lady Heather

On 10/30/2016 9:57 PM, Alberto di Bene wrote: Maybe I am wrong, but, if memory serves, you can only choose between COM1 and COM2. Higher port numbers are not accepted. Well, I was definitely wrong... I looked at the readme.html document of LH, and it says, when describing the command line

Re: [time-nuts] Change COM Port in Lady Heather

___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

Re: [time-nuts] Change COM Port in Lady Heather

Alberto, If you want to always use COM3 you can edit the properties for the shortcut you use to activate LH. That way just clicking on the LH icon will start the program on the correct COM port. That is more convenient than using the command line every time. Here is how to do this: Right

Re: [time-nuts] our favorite topics

It has to do with the manufacturing process and a reduction in cost. I can not speak for other companies, Infinion "killed" the good phase noise performance but the large signal noise is not specified in the data sheet so they are legally "clean" In a message dated 10/30/2016 4:56:38

Re: [time-nuts] our favorite topics

> http://cache.nxp.com/documents/data_sheet/BFG135.pdf?pspll=1 The usual suppliers say that it's no longer available. What do you use/suggest these days? -- These are my opinions. I hate spam. ___ time-nuts mailing list -- time-nuts@febo.com To

Re: [time-nuts] our favorite topics

I typically buy a full box ( 1000) , ask them what they consider as a replacement ... In a message dated 10/30/2016 4:59:13 P.M. Eastern Daylight Time, hmur...@megapathdsl.net writes: > http://cache.nxp.com/documents/data_sheet/BFG135.pdf?pspll=1 The usual suppliers say that it's no

Re: [time-nuts] Change COM Port in Lady Heather

On 10/30/2016 4:15 PM, Richard Mogford wrote: I read that to change the COM port in Lady Heather, you type “/“ and then the COM port number, such as 3. So you enter “/3” to change to COM 3. i tried this, but it does not seem to change the input COM port from 1 to 3. Maybe I am wrong, but,

Re: [time-nuts] our favorite topics

You mentioned suitable transistor availablity being an increasing problem and I have run across that myself. Do you expect Qualcomm's aquisition of NXP to have an impact? NXP is currently the best source I have for fast complementary pairs or even just fast PNPs. On Sun, 30 Oct 2016 16:06:19

Re: [time-nuts] Has anybody checked this? GPSDO in kit

Yes sorry, you are right it is at RS232 levels. -=Bryan=- From: time-nuts on behalf of Mark Sims Sent: October 30, 2016 10:48 AM To: time-nuts@febo.com Subject: [time-nuts] Has anybody checked this? GPSDO in

Re: [time-nuts] Temp/Humidity control systems?

On 28 October 2016 at 01:05, Poul-Henning Kamp wrote: >The exception is the "cold mirror" type of sensor, which measures the > >dewpoint by cooling a mirror and bouncing a light off it to sense the > >temperature where dew condenses on it. Those are expensive, and they >

[time-nuts] Change COM Port in Lady Heather

I read that to change the COM port in Lady Heather, you type “/“ and then the COM port number, such as 3. So you enter “/3” to change to COM 3. i tried this, but it does not seem to change the input COM port from 1 to 3. I checked and the other settings (BPS, etc.) are the same between the two

Re: [time-nuts] our favorite topics

Absolutely ! But not with 2N3904 but rather with a http://cache.nxp.com/documents/data_sheet/BFG135.pdf?pspll=1 In a message dated 10/30/2016 3:27:36 P.M. Eastern Daylight Time, scott.j.sto...@gmail.com writes: Does your text provide a good discussion of the implications of

Re: [time-nuts] our favorite topics

So, the elephant *is* in the room, how majestic. Thanks for taking the time to list some sample books/papers. A lot of general communications systems/RFIC books certainly acknowledge phase noise and the results because of its presence, but I don't know how many have an in depth discussion of ways

Re: [time-nuts] Temp/Humidity control systems?

In message , Chris Albert son writes: >[...] the water comping out of the pipe is always about 58F. Unless you live close to a volcano or an artesian spring, the temperature will be exactly the yearly average

Re: [time-nuts] Temp/Humidity control systems?

There are people making a lot of money installing heating cooling systems that take advantage of the Earth's thermal stability. What they do is dig a hole the size of a swimming pool and lay out a zig-zag pattern of pipe on the bottom of the hole then backfill the hole. Assuming the pipe is

[time-nuts] Has anybody checked this? GPSDO in kit

No, the 4 pin connector is at RS-232 levels. It connects to an RS-232 level converter chip. These "UCCM" devices speak SCPI at 57600,8,N,1 I have Lady Heather talking to them (soon to be released, I promise). I have tested it with four different firmware versions (all have some slight

Re: [time-nuts] our favorite topics

Well, i guess both statements are correct. Most of us (Poddar and I ), and the leading Crystal Oscillator houses ( Axtal, Morion and Wenzel ) and others know the limits imposed by the crystal and the semiconductor. I have several patents how to do it better (noise canceling technique)

Re: [time-nuts] our favorite topics

Moin, I'm quoting the mail in full, because it seems to have not made it to the mailinglist due to its large attachment. I uploaded the attachment to my server, you can find it here: http://time.kinali.ch/Metamaterial_and_MoebiusLoop.pdf On Sat, 29 Oct 2016 20:23:41 -0400 ka2...@aol.com wrote:

Re: [time-nuts] theoretical Allan Variance question

Hi There are entire (big and heavy) books written on quantization errors….. In a counter, there are a number of different sub-systems contributing to the error. Depending on the design, each may ( or may not) be a bit better than absolutely needed. Toss in things like 10 MHz reference

Re: [time-nuts] Has anybody checked this? GPSDO in kit

Hi Any pole mount outdoor antenna with a gain in the 20 to 30 db range should be fine with any of these units. Cable loss can be an issue if it is getting the net gain down below 10 db (antenna gain - cable loss). The frequency is 1.5 GHz so a quick look at the standard tables should give you an

Re: [time-nuts] our favorite topics

Some references, e-mail addresses do not work, see Ref. 8, I hate this https://en.wikipedia.org/wiki/Colpitts_oscillator 7 S. Sarkar, S. Sarkar, B. C. Sarkar. _"Nonlinear Dynamics of a BJT Based Colpitts Oscillator with Tunable Bias Current"_

Re: [time-nuts] our favorite topics

http://read.pudn.com/downloads84/sourcecode/comm/322249/pll_matlab[1]/pll_ma tlab/pll2/colpitts.pdf ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the

Re: [time-nuts] theoretical Allan Variance question

On 10/29/16 10:14 PM, Tom Van Baak wrote: One might expect that the actual ADEV value in this situation would be exactly 1 ns at tau = 1 second. Values of 0.5 ns or sqrt(2)/2 ns might not be surprising. My actual measured value is about 0.65 ns, which does not seem to have an obvious

Re: [time-nuts] our favorite topics

I think "treatment " is the word of choice but we all know what is meant . 73 de Ulrich In a message dated 10/29/2016 8:28:08 P.M. Eastern Daylight Time, preilley_...@comcast.net writes: Please don't take this wrong but your use of the word "treaty" is wrong. I think you mean

Re: [time-nuts] our favorite topics

Good Morning The oscillator market is extremely completive and a few dB can easily make a buy or not decission.It is not the non liner spice type analysis but the non-linear noise analysis that makes the difference. I agree SPICE was never meant for non linear noise. There is a

Re: [time-nuts] Has anybody checked this? GPSDO in kit

>> < The antenna you referenced should be fine. I would hazard to guess that antennas a re a whole separate topic. The gain should be fine. What you need is a clear unobstructed view of the sky. That can be challenging

Re: [time-nuts] theoretical Allan Variance question

FWIW this example in AllanTools generates white pm and compares to the IEEE1139 ADEV formula: https://github.com/aewallin/allantools/blob/master/examples/ieee1139_white_pm.py two comments: 1. Theoretical white noise has infinite power, so limiting the RMS to some value already implies you have

Re: [time-nuts] Has anybody checked this? GPSDO in kit

I ended up buying a pre-cooked Trimble plus a missilehead-like GPS antenna: http://www.ebay.it/itm/252162780444?_trksid=p2057872.m2749.l2649=STRK%3AMEBIDX%3AIT http://www.ebay.it/itm/262679152903?_trksid=p2057872.m2749.l2649=STRK%3AMEBIDX%3AIT This should limit the chance it would be a DOA(well