Re: [time-nuts] Using GPSDO as a Refrence for Protable Amateur Radio Microwave Operations

On 12/22/16 5:06 PM, Scott Stobbe wrote: The other interesting aspect, is that if the transceiver is mobile, even at a lazy pedestrian walking speed of 1 m/s, the resulting Doppler shift is 3 E-9 deltaF. I always visualize this as "how many wavelengths per second".. so if you're at 10 GHz,

Re: [time-nuts] Using GPSDO as a Refrence for Protable Amateur Radio Microwave Operations

The other interesting aspect, is that if the transceiver is mobile, even at a lazy pedestrian walking speed of 1 m/s, the resulting Doppler shift is 3 E-9 deltaF. On Thu, Dec 22, 2016 at 4:36 PM, Bob Camp wrote: > Hi > > For close in phase noise (< 10 Hz) the 10 MHz still wins

[time-nuts] TS2100: Upgrading oscillator?

Good day, During recent repair efforts on my Symmetricom TS2100, I noticed the main PC board has silkscreening, and hole patterns, to cover different types of crystal oscillator. Might it be possible to upgrade from the standard unit (a DIP-14 form factor clock oscillator) to,

[time-nuts] HP 115CR Clock Powerup / Documentation

Hi, I've been fortunate enough to acquire a HP 115CR Frequency Divider/Digital Clock - it's electromechanical and I suspect built in the mid/late 60s - just slightly older than your humble correspondent. It's similar though not identical to the 115CR shown here

Re: [time-nuts] SR620 Failure Code.

Hi > On Dec 22, 2016, at 5:57 PM, Gary Woods wrote: > > On Thu, 22 Dec 2016 16:50:17 -0500, you wrote: > >> That's just crazy, but that was the problem. > > It's documented, so it's not a bug. … so that would make it a feature, right? Bob > > > -- > Gary Woods

Re: [time-nuts] SR620 Failure Code.

On Thu, 22 Dec 2016 16:50:17 -0500, you wrote: >That's just crazy, but that was the problem. It's documented, so it's not a bug. -- Gary Woods AKA K2AHC- PGP key on request, or at home.earthlink.net/~garygarlic Zone 5/4 in upstate New York, 1420' elevation. NY WO G

Re: [time-nuts] Problem with HP 83623A 20 GHz sweep generator stepping up/down 100 Hz when not wanted.

Hi In a country with 50 Hz power lines, figuring out anything at 50, 100 or 150 Hz is going to be a bit exciting. Bob > On Dec 22, 2016, at 4:04 PM, n2lym wrote: > > Dave, > > Look at it with a narrow band SA and see if it's modulated by 100Hz. > > 73, > > Mike N2LYM

Re: [time-nuts] Problem with HP 83623A 20 GHz sweep generator stepping up/down 100 Hz when not wanted.

Read about the synthesizer design of that generator here: https://ia600407.us.archive.org/10/items/Hewlett-Packard_Journal_Vol._42_No._2_1991-04_Hewlett-Packard/Hewlett-Packard_Journal_Vol._42_No._2_1991-04_Hewlett-Packard.pdf Dave, looking at the graph you posted it appears to me that the

Re: [time-nuts] SR620 Failure Code.

Thanks to Jarl OZ9MO my SR620 is running fine again. He pointed me to the manual where I found this. "If the UHF prescaler of channel A is selected when the unit is powered off and then on again, the unit will display "TEST ERROR 34". This error may be corrected by deselecting the UHF of

Re: [time-nuts] SR620 Failure Code.

Complete manuals, including service info, are available on the net. Google for SR620 manual Dave M W2GPS wrote: Time-nuts, My SR620 has started reporting "test error 34" on power-up and will do nothing after that. Does anyone know what that message means? I have a reasonable lab and I

Re: [time-nuts] Using GPSDO as a Refrence for Protable Amateur Radio Microwave Operations

Hi For close in phase noise (< 10 Hz) the 10 MHz still wins over the 100 MHz after multiplication. ADEV of the 10 MHz (with or without frequency scale) will be better on the higher Q resonator. That will always be the low frequency overtone rather than the VHF crystal. Indeed, a large blank 5

Re: [time-nuts] Problem with HP 83623A 20 GHz sweep generator stepping up/down 100 Hz when not wanted.

Dave, Look at it with a narrow band SA and see if it's modulated by 100Hz. 73, Mike N2LYM On Thu, Dec 22, 2016 at 07:39 AM, Dr. David Kirkby (Kirkby Microwave Ltd) wrote: On 22 December 2016 at 03:17, paul swed wrote: Dave Congratulations on 10 Ghz SSB. This was not a QSO at

Re: [time-nuts] Problem with HP 83623A 20 GHz sweep generator stepping up/down 100 Hz when not wanted.

Hi David: Some time ago I built an automated mixer test system where I first attempted to use HP 8350B sweep generators as the sources for the LO and RF inputs, but this failed to work because at the narrow bandwidth settings on the HP 8566 spectrum analyzer there was way too much phase noise,

Re: [time-nuts] Ublox M8N - have I a XO or TCXO ?

On 22/12/2016 16:04, David wrote: On Wed, 21 Dec 2016 19:29:00 +, you wrote: You may be able to identify the initial steady current drawn by the TCXO heater, then the cycling once it's hit the right temp? If there's no change at all in average current as it warms then it may not have a

Re: [time-nuts] Using GPSDO as a Refrence for Protable Amateur Radio Microwave Operations

Well for the same Q a competing oscillator will still take a 20 dB phase noise increase for every frequency decade you scale up to. If Q*f is approximately constant, you take another 20 dB hit in phase noise from degraded Q, totaling 40 dB/decade. Compared to 20 dB/decade plus the noise introduced

Re: [time-nuts] SR620 Failure Code.

Hi There are a number of SRS 620’s with big block letter warning sheets taped to the top of them about error 34. It is a *very* common thing to run into and (obviously) something the guys in the repair shop get tired of really fast. Bob > On Dec 22, 2016, at 1:27 PM, Magnus Danielson

Re: [time-nuts] u-blox LEAH M8F

Hi There are a couple of issues in multi GNSS timing. One is the basic time offset between systems (maybe a few ns, maybe a lot more). The next is the accuracy of the estimate of that offset (again maybe a few ns, maybe …). After that you get into things like survey accuracy. Position hold is a

Re: [time-nuts] SR620 Failure Code.

Here you can find all about the SR620: search for SR620. On Thu, Dec 22, 2016 at 5:53 PM, W2GPS wrote: > Time-nuts, > > > > My SR620 has started reporting "test error 34" on power-up and will do > nothing after that. Does

Re: [time-nuts] SR620 Failure Code.

Rick, On 12/22/2016 05:53 PM, W2GPS wrote: Time-nuts, My SR620 has started reporting "test error 34" on power-up and will do nothing after that. Does anyone know what that message means? I have a reasonable lab and I would try to repair the unit myself but I have no documentation. Is service

[time-nuts] SR620 Failure Code.

Time-nuts, My SR620 has started reporting "test error 34" on power-up and will do nothing after that. Does anyone know what that message means? I have a reasonable lab and I would try to repair the unit myself but I have no documentation. Is service documentation available or should I just

Re: [time-nuts] u-blox LEAH M8F

There was an interesting comment in the Lea-m8f datasheet, "In strong signal clear-sky applications the best time pulse consistency between neighbouring receivers is achieved when using a single GNSS because of the small time offsets between different GNSS systems. " On Thu, Dec 22, 2016 at 8:01

Re: [time-nuts] Problem with HP 83623A 20 GHz sweep generator stepping up/down 100 Hz when not wanted.

On Thu, 22 Dec 2016 12:39:27 +, you wrote: >But I find it a bit odd that HP would have a 1 Hz software option on this >instrument, if the instrument jumped up/down 100 Hz. > >Now I don't yet have the 1 Hz option programmed in, and it might well >change the behavior completely, but I'd still

Re: [time-nuts] Ublox M8N - have I a XO or TCXO ?

On Wed, 21 Dec 2016 19:29:00 +, you wrote: > Can anyone comment on the following data, and whether they think the > oscillator in "my" M8N is a XO or a TCXO ? > >Can you monitor the current draw from cold (ambient)? > >You may be able to identify the initial steady current drawn by

Re: [time-nuts] Using GPSDO as a Refrence for Protable Amateur Radio Microwave Operations

On Wed, 21 Dec 2016 18:59:20 -0800 Chris Albertson wrote: > Why to people always build 10MHz GPSDOs? If the use of the GPSDO is to > drive a microwave, why not build a MUCH higher frequency GPSDO.Is the > reason that 10MHz crystals just happen to be very good and

Re: [time-nuts] Using GPSDO as a Refrence for Protable Amateur Radio Microwave Operations

On 12/21/16 9:08 PM, John Hawkinson wrote: Chris Albertson (and Bob Camp ): Why to people always build 10MHz GPSDOs? Because "a lot" (...) of amateur radio microwave equipment is designed off the shelf to accept an external 10 MHz input. [And other

Re: [time-nuts] u-blox LEAH M8F

I was slightly imprecise in my previous posting about ubx timing modules and a few people have raised queries in the list or by email. What I should have said is that this module is designed as a precise low-noise /frequency /reference so it directly generates the 30.72 MHz needed in LTE

Re: [time-nuts] Ublox M8N - have I a XO or TCXO ?

TCXO usually refers to Temperature Compensated Crystal Oscillator (no heater), as opposed to Oven Controlled Crystal Oscillator (OCXO) which has an oven. I would not expect a TCXO to become warm or draw more current at power up. An OCXO would. Didier KO4BB On December 21, 2016 1:29:00 PM CST,

Re: [time-nuts] Ublox M8N - have I a XO or TCXO ?

TCXO is not an OCXO, they don't have an oven. They compensate the temperature induced drift using a temperature sensor, a microcontroller and a table or parameter set for adjusting the output frequency. BTW, for some applications they are unsuitable as they adjust the frequency in steps.

Re: [time-nuts] Problem with HP 83623A 20 GHz sweep generator stepping up/down 100 Hz when not wanted.

On 22 December 2016 at 01:35, Brooke Clarke wrote: > Hi David: > > Do you have a comb generator? > No. Dave ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] Problem with HP 83623A 20 GHz sweep generator stepping up/down 100 Hz when not wanted.

On 22 December 2016 at 03:51, Tom Knox wrote: > If it is any help, the 836XXA/B series are all capable of 1Hz resolution > but are locked at 1KHz unless you enter the license key for option 008. So > it could be software/firmware related. > > Happy Merry; > > Thomas Knox > I

Re: [time-nuts] Problem with HP 83623A 20 GHz sweep generator stepping up/down 100 Hz when not wanted.

On 22 December 2016 at 03:17, paul swed wrote: > Dave Congratulations on 10 Ghz SSB. > This was not a QSO at all. It was simply a one way transmission from a signal generator at my end to a receiver at his end. No QSO was attempted. > Now to your question. I will fully

Re: [time-nuts] Ublox M8N - have I a XO or TCXO ?

Can anyone comment on the following data, and whether they think the oscillator in "my" M8N is a XO or a TCXO ? Can you monitor the current draw from cold (ambient)? You may be able to identify the initial steady current drawn by the TCXO heater, then the cycling once it's hit the

Re: [time-nuts] Using GPSDO as a Refrence for Protable Amateur Radio Microwave Operations

On 12/21/2016 2:06 PM, Eric Haskell wrote: I am microwave amateur radio operator. A friend was discussing using an eBay purchased Trimble 57963-D for providing a 10 MHz reference. As you stated, the time needed for position hold is significant. For my microwave gear that needs 10 MHz in the

[time-nuts] u-blox LEAH M8F

I was slightly imprecise in my previous posting about ubx timing modules and a few people have raised queries in the list or by email. What I should have said is that this module is designed as a precise low-noise /frequency /reference so it directly generates the 30.72 MHz needed in LTE

Re: [time-nuts] Problem with HP 83623A 20 GHz sweep generator stepping up/down 100 Hz when not wanted.

Dr. David Kirkby (Kirkby Microwave Ltd) wrote: snip .. The radio ham that noticed this step change in frequency is well used to listening on 10 GHz, and hearing beacons. So I think its reasonable to assume that the problem is not his end, but my end. Any thoughts, which do NOT include