Re: [time-nuts] Outdoor GPS Antenna Selection

Good quality RG6 has less loss and the mismatch is small. You see a lot of GPS receivers and antennas with F connectors even though they generally are 50 ohms. 26 dB of gain should work fine for 20 feet of RG6. Probably also good for good RG58. - Original Message - From: "Duane

Re: [time-nuts] AM vs PM noise of signal sources

Wien bridge and bridged T oscillators often use a thermistor [lamp] to set the amplitude below saturation, for low distortion, but i`ve seen the diode AGC method used. Conversely, you could use a thermistor to set the output of a crystal or L/C oscillator. One other method seems to be to let

[time-nuts] Outdoor GPS Antenna Selection

I'm selecting an outdoors antenna for a Jupiter Pico T Timing GPS (TU36-D400-020) but don't clearly understand what "dB" rating of amplified antenna to use. From web references, it looks like the degree of amplification required is dependent on 1.) The length of run of coax lead-in, combined

Re: [time-nuts] AM vs PM noise of signal sources

Am 07.01.2018 um 17:05 schrieb Arnold Tibus: but I see quite often mentioned the 'Wein bridge'. (Wein in german is 'vino' or 'wine' ;-) Not of real technical importance, but shouldn't this not be correctly called a 'Wien bridge'? As I know that this tricky circuit was developed by Max Wien

Re: [time-nuts] AM vs PM noise of signal sources

I`m looking at the circuit of an H/P10544 oscillator - can anybody confirm, please, if the H'P transistor types : 53-20, and 54-215 have commercial equivalents? Thankyou

[time-nuts] LED replacement screen for 53131A 53132A!!??

I never decided on a particular display to use. I was thinking along the lines of 192x32 LCD displays. LEDs could be used, but I didn't see any alphanumeric LEDs on Ebay that were small enough. I didn't check places like Digikey. Also, doing the annunciators with LEDs adds some complexity

Re: [time-nuts] Reference input on HP counters

On 1/7/18 9:55 AM, Jerry Hancock wrote: As far as lazy, I will check my equipment. When the others that replied using the term “lock” or “locked”, what do you mean by that? That for instance, the external reference is multiplied up directly to the internal frequency (IF I suppose) or is it

[time-nuts] Reference input on HP counters

On the 531xx counters the priority is the external input, the OCXO option, and the (terrible) on board crystal. I seem to remember coming across a menu option for forcing a particular source. ___ time-nuts mailing list -- time-nuts@febo.com To

Re: [time-nuts] Reference input on HP counters

Hi > On Jan 7, 2018, at 12:55 PM, Jerry Hancock wrote: > > As far as lazy, I will check my equipment. > > When the others that replied using the term “lock” or “locked”, what do you > mean by that? That for instance, the external reference is multiplied up > directly to

Re: [time-nuts] AM vs PM noise of signal sources

Hi > On Jan 7, 2018, at 12:26 PM, jimlux wrote: > > On 1/7/18 8:05 AM, Arnold Tibus wrote: >> Am 07.01.2018 um 16:33 schrieb jimlux: >>> On 1/6/18 6:12 PM, Dana Whitlow wrote: One point about oscillator design I've not yet seen mentioned is this: the limiter

Re: [time-nuts] Reference input on HP counters

As far as lazy, I will check my equipment. When the others that replied using the term “lock” or “locked”, what do you mean by that? That for instance, the external reference is multiplied up directly to the internal frequency (IF I suppose) or is it phase locked, for instance? I’m sure

Re: [time-nuts] AM vs PM noise of signal sources

On 1/7/18 8:05 AM, Arnold Tibus wrote: Am 07.01.2018 um 16:33 schrieb jimlux: On 1/6/18 6:12 PM, Dana Whitlow wrote: One point about oscillator design I've not yet seen mentioned is this: the limiter must not degrade the resonator Q when in action.  Hence, a pair of diodes connected in

Re: [time-nuts] AM vs PM noise of signal sources

You are simply correct ! Ulrich Sent from my iPhone > On Jan 7, 2018, at 11:05 AM, Arnold Tibus wrote: > >> Am 07.01.2018 um 16:33 schrieb jimlux: >>> On 1/6/18 6:12 PM, Dana Whitlow wrote: >>> One point about oscillator design I've not yet seen mentioned is this: the

Re: [time-nuts] AM vs PM noise of signal sources

It is a Wien bridge Sent from my iPhone > On Jan 7, 2018, at 10:33 AM, jimlux wrote: > >> On 1/6/18 6:12 PM, Dana Whitlow wrote: >> One point about oscillator design I've not yet seen mentioned is this: the >> limiter >> must not degrade the resonator Q when in

Re: [time-nuts] time-nuts Digest, Vol 162, Issue 11 Phase Noise of Oscillators

To the learned group: The recent comment (below) stirred my memory. While by no means an expert, I remember form my early career at Westinghouse Defense building low noise S-Band VCOs for the AWACS radar system that oscillator noise was key to the performance of the pulse doppler radar (MOPA

Re: [time-nuts] Reference input on HP counters

On 1/7/18 7:21 AM, Jerry Hancock wrote: I’m being a little lazy as I can check the schematics, but in the general case, do HP counters, frequency generators, etc, switch to the external reference when one is available or discipline the internal oscillator? Are there brands of test equipment

Re: [time-nuts] AM vs PM noise of signal sources

Am 07.01.2018 um 16:33 schrieb jimlux: On 1/6/18 6:12 PM, Dana Whitlow wrote: One point about oscillator design I've not yet seen mentioned is this: the limiter must not degrade the resonator Q when in action.  Hence, a pair of diodes connected in parallel back to back, across a shunt

Re: [time-nuts] Reference input on HP counters

Jerry It depends on the unit and age. There are not rules of thumb from my experiance. Some of the approaches in HP as an example Have switches and demand a specific frequency and level. Some lock an internal reference to any multiple of a reference freq like 5 or 10 MHz. Some are direct some are

Re: [time-nuts] Reference input on HP counters

Hi > On Jan 7, 2018, at 10:21 AM, Jerry Hancock wrote: > > I’m being a little lazy as I can check the schematics, but in the general > case, do HP counters, frequency generators, etc, switch to the external > reference when one is available or discipline the internal

Re: [time-nuts] AM vs PM noise of signal sources

On 1/6/18 6:12 PM, Dana Whitlow wrote: One point about oscillator design I've not yet seen mentioned is this: the limiter must not degrade the resonator Q when in action. Hence, a pair of diodes connected in parallel back to back, across a shunt resonator, would be a bad thing to do from the

[time-nuts] Reference input on HP counters

I’m being a little lazy as I can check the schematics, but in the general case, do HP counters, frequency generators, etc, switch to the external reference when one is available or discipline the internal oscillator? Are there brands of test equipment that generally discipline vs switch?

Re: [time-nuts] AM vs PM noise of signal sources

Hi > On Jan 6, 2018, at 9:12 PM, Dana Whitlow wrote: > > One point about oscillator design I've not yet seen mentioned is this: the > limiter > must not degrade the resonator Q when in action. Hence, a pair of diodes > connected in parallel back to back, across a shunt

Re: [time-nuts] AM vs PM noise of signal sources

Hi > On Jan 7, 2018, at 8:02 AM, Ulrich Rohde via time-nuts > wrote: > > This and related topics are presented in : > > > [BOOK] The design of modern microwave oscillators for wireless applications: > theory and optimizationUL Rohde, AK Poddar, G Böck - 2005 -

Re: [time-nuts] Time stamp degradation being added in javascript

From: David Possibly not of immediate concern to time-nuts but an article had some trigger words for them in the initial fixes to the much publicised problems with Intel/AMD/ARM etc : "After these changes, the time stamp returned by |performance.now| will be less precise due to lower

[time-nuts] Time stamp degradation being added in javascript

Possibly not of immediate concern to time-nuts but an article had some trigger words for them in the initial fixes to the much publicised problems with Intel/AMD/ARM etc : "After these changes, the time stamp returned by |performance.now| will be less precise due to lower resolution. Some

Re: [time-nuts] AM vs PM noise of signal sources

This and related topics are  presented in :     [BOOK] The design of modern microwave oscillators for wireless applications: theory and optimizationUL Rohde, AK Poddar, G Böck - 2005 - books.google.com Delivering the best possible solution for phase noise and output power efficiency in 

Re: [time-nuts] AM vs PM noise of signal sources

Does any limiter, soft or hard, [and perhaps any nonlinearity of power term 3 or greater in the amplifier of an oscillator] cause the "baseband 1/f noise to translate up to the resonator frequency [a form of crossmodulation]?. I wonder this because phase noise vs freq plots look a bit like the

Re: [time-nuts] AM vs PM noise of signal sources

One point about oscillator design I've not yet seen mentioned is this: the limiter must not degrade the resonator Q when in action. Hence, a pair of diodes connected in parallel back to back, across a shunt resonator, would be a bad thing to do from the perspective of low phase noise. A