Re: [time-nuts] Does doubling a frequency alter the original ADEV of the frequency?

Charles, Thanks for the reminder about this... it will neatly solve a problem I have at hand. Can you advise which core you used for the transformer? Thanks, david On 10/07/2016 07:57, Charles Steinmetz wrote: James wrote: Is there a preferred frequency doubler circuit which would do

Re: [time-nuts] PRS10 C900 replacement

Hi All, I used the TAP225K035SRW, from Mouser, and have the PRS10 running again. In the process of pulling it apart I managed to break one of the glass thermistors (Mouser replacement from US Sensor, part number 104JG1F). Doh. Whether it was the lamp temperature change (thermistor) or

[time-nuts] PRS10 C900 replacement

Hi All, While still appearing to function normally, my PRS10 started to smell: C900 in the lamp assembly has self destructed. The SRS parts manual merely says "Capacitor, Tantalum, 35V, 20%, Rad", so I'd appreciate any advice on what additional parameters I should be looking at in selecting

Re: [time-nuts] PRS10 C900 replacement

nmark) -Oprindelig meddelelse- From: davidh Sent: Tuesday, January 19, 2016 11:21 PM To: time-nuts-jsktletq...@public.gmane.org Subject: [time-nuts] PRS10 C900 replacement Hi All, While still appearing to function normally, my PRS10 started to smell: C900 in the lamp assembly has self destr

[time-nuts] PRS10 Heatsink Temperature

Hi All, I'm moving a PRS10 Rb to a new case. In the current case, the heatsink's getting to around 60dC, which is getting close to the maximum operating spec of 65dC. I plan to add a small temperature controlled fan to limit the heatsink temperature. Can anyone recommend a suitable setpoint

Re: [time-nuts] PRS10 Heatsink Temperature

Charles and Bob, Thanks. I'll report back on how it works out. david n 24/11/2015 10:33 AM, Charles Steinmetz wrote: David wrote: I plan to add a small temperature controlled fan to limit the heatsink temperature. Can anyone recommend a suitable setpoint for the heatsink? An SRS

[time-nuts] PM6681 and Timelab (was: PM6680 or 53131A for TimePod)

Hi Angus, I have three 6681s operating concurrently under a single instance of timelab beta. It operates perfectly, even live n-cornered measurements. Kudos to John! The only downside (and I understand why it's this way) is that each counter needs a unique GPIB interface, but this is a

Re: [time-nuts] Troubleshooting Fluke PM6681

Magnus, I have a few of these counters and would love to see the details of the calibration process you mention. Cheers. david On 17/08/2015 5:16 AM, Magnus Danielson wrote: Ole, I checked with a former Pendulum employee, and free off memory, he recommend trimming up the 100 MHz until

Re: [time-nuts] 3048A software question

on a floppy disk and 640k of memory, together with a 33 MHz 486 did the job. Btw. a modern 2,000 MHz or something clocked PC with 4,000,000k of memory doesn't seem to work any faster... And, no, even if you get MS-DOS installed on it, you're not gonna have much fun. Adrian davidh schrieb: Folks, I'm

Re: [time-nuts] 3048A software question

Folks, I'm also working on getting the MSDOS version running. What is the most recent version of DOS that people have found to work with the A 01.01 version. Also, can anyone advise where the command drivers for the 82335 can be found? Cheers, david Hi Adrian, Got the spec lines

[time-nuts] USB Serial ports, was Re: LTE-Lite

Hi, For Windows, ComPortMan does a great job of managing comm port assignments. Available at http://www.uwe-sieber.de/comportman_e.html Cheers, david On 29/11/2014 9:42 AM, Hal Murray wrote: kb8tq-wyfad0z3...@public.gmane.org said: The “new chip ID, new com port” thing is pretty

Re: [time-nuts] Have some Leica/AeroAntenna Tech Inc Choke Ring antennas for sale

Hi Pete, I'll take a couple of these of your hands if possible. I'm in Australia, but using a shipping agent in California, so it'll just be domestic freight. Let me know. david dho...@gmail.com I've acquired a few new in the box Leica/AeroAntennas. Some boxes have been opened.

Re: [time-nuts] Have some Leica/AeroAntenna Tech Inc Choke Ring antennas for sale

Sorry Everyone, I thought I replied only to Pete. david Hi Pete, I'll take a couple of these of your hands if possible. I'm in Australia, but using a shipping agent in California, so it'll just be domestic freight. Let me know. david dho...@gmail.com I've acquired a few new in the

Re: [time-nuts] 10811 Thermal fuse?

Dan, On Ebay you'll find a seller called newdeparture2010 who has a good range of fuses. He saved me a bucket load of money when I needed replacement LittleFuses to repair my 11848A, before I learnt the right way to apply the K23 to power supply measurements. Cheers. david On 3/09/2014

Re: [time-nuts] Symmetricom 1111C OCXO question

Hi All, Can anyone advise the supply voltage and range of the control voltage for these gadgets? Cheers, david On 03.04.2014 18:25, Azelio Boriani wrote: Other idea than leaving the 6K8 resistor? Yes... I would prefer to know why the little thing has stopped working. The 6k8 resistor

Re: [time-nuts] ARM boards for low-cost GPSDOs

Hi All, I've used the STM32F4 for a few projects, and was considering it for a time tagger for a DMTD system. I have a question about the clocking though that someone may be able to help me with. The 32F4 (like lots of similar ARMs) uses a PLL to generate the internal clocks from much

Re: [time-nuts] GPSDO control system

Howdy Charles, Could you tell us more about the PLL, what sort of phase comparator, filters and so forth. I'd be keen to duplicate and test your configuration. Thanks, david David wrote: How do you lock your OCXO to the PRS10? I just use a 1:1 PLL. Some will argue that phase

Re: [time-nuts] GPSDO control system

Hi Charles, How do you lock your OCXO to the PRS10? Thanks, david I've lost track now of who it was, but someone asked if there was a better strategy than a GPS disciplined quartz oscillator or a GPS disciplined rubidium. My best standard uses an SRS PRS10 rubidium disciplined by GPS PPS

[time-nuts] L1/L2 GPS Receiver

Folks, I've stumbled across a Novatel 720L, so would like a new receiver module which supports L1/L2. The main goal is to start learning about GPS/Galileo/Beidou. I may use the derived 1pps as input to my PRS10/10811D reference (or may continue using the 58503A). My budget is quite limited.