[time-nuts] Lady Heather V3.10 release

2012-06-20 Thread John Miles
Another long-awaited announcement: http://www.ke5fx.com/heather/readme.htm Highlights of V3.10: - No longer a beta! - Added support for Nortel NTGS50A-series receivers - Added support for Resolution-T and Resolution SMT receivers - Various other stuff added by Mark in the 18 months

[time-nuts] 10 MHz low pass filter

2012-06-20 Thread Joseph Gray
I came across this filter design recently and thought I'd build a few. http://www.jwmeng.com/AppNote/AppNote003.html I was about to place a Mouser order when I came across someone selling filters, based on the above design.

Re: [time-nuts] 10 MHz low pass filter

2012-06-20 Thread paul
On 6/20/2012 4:54 PM, Joseph Gray wrote: I came across this filter design recently and thought I'd build a few. http://www.jwmeng.com/AppNote/AppNote003.html I was about to place a Mouser order when I came across someone selling filters, based on the above design.

Re: [time-nuts] 10 MHz low pass filter

2012-06-20 Thread Bob Camp
Hi That's a pretty high order filter. The output of most OCXO's already has a filter on it. Combining two filters (especially high order ones) without isolation between them is not a good idea. The resulting transfer function will not be what you expect it to be…. Bob On Jun 20, 2012, at

Re: [time-nuts] Lady Heather V3.10 release

2012-06-20 Thread mike cook
Le 20/06/2012 10:22, John Miles a écrit : Another long-awaited announcement: http://www.ke5fx.com/heather/readme.htm Highlights of V3.10: - No longer a beta! - Added support for Nortel NTGS50A-series receivers - Added support for Resolution-T and Resolution SMT receivers Thanks

Re: [time-nuts] Lady Heather V3.10 release

2012-06-20 Thread mike cook
Le 21/06/2012 00:13, mike cook a écrit : Le 20/06/2012 10:22, John Miles a écrit : Another long-awaited announcement: http://www.ke5fx.com/heather/readme.htm Highlights of V3.10: - No longer a beta! - Added support for Nortel NTGS50A-series receivers - Added support for Resolution-T and

Re: [time-nuts] Lady Heather V3.10 release

2012-06-20 Thread mike cook
Le 21/06/2012 00:18, mike cook a écrit : 39.517°N, 76.794°W Recognise it? Flashy place near Baltimor. Oops I just looked at the installed properties and see they point to a LH server. Aargh! All OK now. ___ time-nuts

Re: [time-nuts] 10 MHz low pass filter

2012-06-20 Thread lists
If the output is buffered, there really shouldn't be a problem. Incidentally, I can crank out high order LCR filters all day just by transforming prototypes out of Zverev. But it has been my experience at even 10MHz the parasitics of the elements will throw off the design. -Original

Re: [time-nuts] Lady Heather V3.10 release

2012-06-20 Thread John Miles
-Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of mike cook Sent: Wednesday, June 20, 2012 3:28 PM To: time-nuts@febo.com Subject: Re: [time-nuts] Lady Heather V3.10 release Le 21/06/2012 00:18, mike cook a écrit :

Re: [time-nuts] 10 MHz low pass filter

2012-06-20 Thread Thomas S. Knutsen
Based on that PCB, I want to see an sweep to at least 1GHz. The reason is that experience have shown that the inductance (perhaps 10nH) in series with C2 and C6 would damage the stop-band rejection at UHF. Used with an OXCO this would not matter, but the desire to make the ultimate filter is

[time-nuts] Power glitch

2012-06-20 Thread Hal Murray
I had a power glitch last night. It shows up as a step on the 60 Hz clock-drift graph. That reminded me that I had another glitch a few weeks ago. 16 seconds: http://www.megapathdsl.net/~hmurray/time-nuts/60Hz/60Hz-2012-Jun-20-gap.png 0.1 second:

Re: [time-nuts] 10 MHz low pass filter

2012-06-20 Thread Joseph Gray
I thought I'd put one on a FE-5680A and see what happens to the third harmonic. It might also be interesting to see if I get a decent sine wave out of the filter with a square wave in. Joe Gray W5JG On Wed, Jun 20, 2012 at 3:49 PM, Bob Camp li...@rtty.us wrote: Hi That's a pretty high order

Re: [time-nuts] 10 MHz low pass filter

2012-06-20 Thread lists
In the days when I had access to a network analyzer with a chip component fixture (all calibrated of course), I tested components on hand just to see how ideal they were. Chip resistors are quite good. The inductance is basically the electrical length of the device. Caps can be decent. My

Re: [time-nuts] 10 MHz low pass filter

2012-06-20 Thread Thomas S. Knutsen
I don't have any problems with rotating the inductors, after all, that is one of the best way to avoid coupling between them, but the main problem as I see with that board is that there are 2 caps that would become an series resonance with the inductance in the via to reach the ground plane. Of

Re: [time-nuts] 10 MHz low pass filter

2012-06-20 Thread Bob Camp
Hi The next sine wave OCXO that I see with a buffered output will be the first one. Every one I've seen has an LC filter between the output amp and the connector. If you are lucky you might have a pad, but that's not much to count on. Bob On Jun 20, 2012, at 7:01 PM, li...@lazygranch.com

Re: [time-nuts] 10 MHz low pass filter

2012-06-20 Thread Bob Camp
Hi The standard FE-5680 very much has an LC filter between the output amp and the output pin. I'd take out their filter and put this one in. I would not use both together. Bob On Jun 20, 2012, at 7:23 PM, Joseph Gray wrote: I thought I'd put one on a FE-5680A and see what happens to the

Re: [time-nuts] Power glitch

2012-06-20 Thread David J Taylor
I had a power glitch last night. It shows up as a step on the 60 Hz clock-drift graph. That reminded me that I had another glitch a few weeks ago. 16 seconds: http://www.megapathdsl.net/~hmurray/time-nuts/60Hz/60Hz-2012-Jun-20-gap.png 0.1 second: