Re: [time-nuts] Phase noise Jitter

If you haven't seen this yet: http://www.ke5fx.com/HP_PN_seminar.pdf (7 MB) ... I'd strongly encourage you to check it out. The early part of the document answers some of those questions pretty well. -- john, KE5FX -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]

Re: [time-nuts] Phase noise Jitter

Then for good measure, read this one: http://www.ko4bb.com/Manuals/5)_GPS_Timing/John_Vig_Quartz_Crystal_Oscillato r_Tutorial.pdf Didier -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of John Miles Sent: Monday, April 28, 2008 1:15 AM To:

Re: [time-nuts] How do you minimise jitter?

Hello Don, close-in phase noise within the PLL loop filter bandwidth in Synthesized Signal Generators is a quality of the components used (among others), and the optimization of the design. For an output that is generated directly by the Oscillator (not a divider chain, DDS etc) three

Re: [time-nuts] Phase noise Jitter

Don Collie jnr wrote: I`m sorry, but I don`t understand what you mean in your second sentence Bruce. Thankyou for your comments, both!Don C. Don Rephrasing: A VCO with a higher phase noise floor will have after division a higher close in phase noise than a VCO

[time-nuts] Trimble T'BoltMon Software

Two versions of the T'BoltMon software are available at the Trimble website. V2.60 for the older Thunderbolt can be found at: http://www.trimble.com/tmg_thunderbolt_ts.asp?Nav=Collection-2357 V3.16 for the Thunderbolt E can be found at: http://www.trimble.com/thunderbolte_ts.asp Both work

[time-nuts] FE-5650A Rb: your opinions?

At this date I have no frequency standard at home. I'd like to buy one FE-5650A Rb used unit (230US$ s/h included) so I will be able to use it as a reference/comparation for my future DIY GPSDO. BTW, I found interesting the provision to use the internal DDS to generate different frequencies than

Re: [time-nuts] Phase noise Jitter

Don, One effect I have observed on uP clock generators is that fully differential circuits which utilize the crossover of complementary signals are capable of lower jitter performance than single ended circuits. At least 2 performance gains are obvious; 1) the effective p-p swings are doubled 2)

[time-nuts] phase noise/jitter

Hello Bruce and all, OK, now I think I understand : the more phase noise on the VCO, the more jitter on the output of the divide by N. This output spectrum comprises *only* the PRF+ close-in noise sidebands [plus harmonics, and their noise sidebands]. Since the lowest frequency

Re: [time-nuts] Phase noise Jitter

Hi Don, Any comparator or slicer has a noise density and a noise bandwidth. The noise value of this slicer is the integral of the noise density over the noise bandwidth. The noise bandwidth is the slicer bandwidth, not the slicer frequency. Due to the slope, thus the slew rate, of the

[time-nuts] FE-5650A

Elio, I have an FE-5650A, and am very pleased with it. Yes, it will operate on any frequency from 0 to nearly 20MHz, but I think it will depend on which option you get. Mine was an Opt 58 I think, which originally had outputs at 8.388688MHz and 1pps. It is now modified to add a serial link for

Re: [time-nuts] FE-5650A Rb: your opinions?

Given the low prices Thunderbolts have been selling for lately, I believe most people are better off with one of those, or a similar high-quality GPS slock. If you expect very poor GPS coverage with lots of complete signal dropouts, then perhaps an Rb-based standard makes more sense. -- john,

[time-nuts] Zeta Labs X76 Multiplier 7600 MHz Output Model 5856-01

Just bought a Zeta Labs X76 Multiplier 7600 MHz Output Model 5856-01 on ebay. Anybody have any info on these? What kind of drive should I give it? Thanks, Matt ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

[time-nuts] Power numbers

I don't have a Thunderbolt, but I do have a Z3801A. It's running off a 48V 1.6A switcher. Idle (no Z3801A) 4W, 6VA Normal (after warmup) 20W, 33VA During warmup 35W, 51VA Measurements are at the wall, using a Kill-A-Watt. They are down around $20 now. -- These are my opinions, not

Re: [time-nuts] phase noise/jitter

Don Don Collie jnr wrote: Hello Bruce and all, OK, now I think I understand : the more phase noise on the VCO, the more jitter on the output of the divide by N. This output spectrum comprises *only* the PRF+ close-in noise sidebands [plus harmonics, and their noise sidebands]. Since

Re: [time-nuts] Zeta Labs X76 Multiplier 7600 MHz Output Model 5856-01

Matt Ettus wrote: Just bought a Zeta Labs X76 Multiplier 7600 MHz Output Model 5856-01 on ebay. Anybody have any info on these? What kind of drive should I give it? Thanks, Matt Matt, You'll be very lucky to find data for an old exotic beast like that. It looks like a step

Re: [time-nuts] Power numbers

My thunderbolt power measurements: Voltage Current (Trimble spec) Actual (during warm-up) Actual (in operation) +12 V 750 mA 530 mA 160 mA +5 V 400 mA 260 mA 260 mA -12 V 10 mA 3 mA 3 mA /tvb ___ time-nuts mailing list --

Re: [time-nuts] Phase noise Jitter

Henk ten Pierick wrote: Hi Don, Any comparator or slicer has a noise density and a noise bandwidth. The noise value of this slicer is the integral of the noise density over the noise bandwidth. The noise bandwidth is the slicer bandwidth, not the slicer frequency. Due to the slope,

Re: [time-nuts] phase noise/jitter

Don Collie jnr wrote: Hello Bruce and all, OK, now I think I understand : the more phase noise on the VCO, the more jitter on the output of the divide by N. This output spectrum comprises *only* the PRF+ close-in noise sidebands [plus harmonics, and their noise sidebands]. Since the

Re: [time-nuts] Zeta Labs X76 Multiplier 7600 MHz Output Model 5856-01

I worked for Zeta Labs many years ago. This multiplier undoubtedly has a step recovery diode that is being driven at a level of a good watt or two. In most cases there was a hefty transistor to make this power. You probably need +10 dBm or so to drive it, maybe as much as +20 dBm. Take the

Re: [time-nuts] Zeta Labs X76 Multiplier 7600 MHz Output Model 5856-01

Thanks Rick. My main reason for buying this is to be able to better measure the phase noise of my 100 MHz oscillator. I figured this would give a truer measure than a brick since there is no PLL involved. But then I thought there might be too much filtering going on. If the filters are at

Re: [time-nuts] Zeta Labs X76 Multiplier 7600 MHz Output Model5856-01

Usually bricks are good for at least a few MHz either side of the sweet spot. There's little incentive for the manufacturer to install an expensive crystal filter. I'd just sweep it by hand with an 8640B or something like that, to verify the frequency and power levels it wants to see. BTW, I

[time-nuts] Looking for HP5085A info...

Does anyone have a manual or at least a schematic for an HP-5085A back-up power supply? I searched the web and didn't find anything. That doesn't mean it's there, just that I was unable to find it! Thanks in advance, -Brian, WA1ZMS ___ time-nuts

Re: [time-nuts] Zeta Labs X76 Multiplier 7600 MHz Output Model 5856-01

This is a complicated question. First of all, there is definitely no crystal filter involved. However, the multiplier can have its own phase noise due to either the amplifier or the SRD. There can also be AM to PM conversion and vice versa. I have found the technique of multiplying a source to

[time-nuts] Phase Noise/Jitter/SNR/N to Slope ratio etc

So to summarise : To make a synthesiser`s phase noise low : - Apply the KIS principle [Keep It Simple] - Use high speed [non-saturating?] logic rather than low - The logic supplies should be well regulated, distributed and decoupled. - Make the PRF to the P/F detector as high as