Re: [time-nuts] 5061B info.

Jeff, What is the 2nd harmonic meter reading? If it is too low you will not be able to get the operate light on. While watching the 2nd harmonic reading adjust the front panel beam I pot for a reading of 35 to 45. If pot is at max adjust the loop gain thru the front panel hole for the 35-45

Re: [time-nuts] 5061A troubleshooting

Scott, I'm not sure how late a model you have but on the A15 board you should see a place for two resistors that are connected on the board in parallel. If you connect a high resitance decade resistor (start at 10Megs) across one of the resistors. Now while monitoring the EM divided voltage

Re: [time-nuts] Short term stabilites of some HP 5065A

There have been indications in the literature going back over 20 years that some HP 5065A have VERY good short term stabilities, exceeding the specifications by a large margin. One of my aquaintances has tested all the newest rubidiums, including the ones claiming superior short term stabilities.

Re: [time-nuts] Austron 1250B

Hi, I am playing with an Austron 1250B and I'd like to add a fine frequency adjust. The data sheet I have on the 1150 oscillator inside indicates that the EFC input is an option. Anyone have a schematic for the 1250B that shows how the 1150 is wired in. If no EFC on this unit I'll be getting

Re: [time-nuts] 10811A vs 10811-60111

Ulrich, The 1200 #1 is built into a GR1115B that had a defective oscillator assy. It could be that the power supply and or the EFC tuning circuit which is hooked to the manual adjust pot is causing the difference. If I get a chance I'll pull the oscillator and retest it and se what happens. I

Re: [time-nuts] Efratom FRKH

Hi, Anyone have a good Efratom FRKH module. The version with the row of exposed pins vice the one with the multipin 3 row connector? Thanks, Corby Dawson Love Graphic Design? Find a school near you. Click Now.

Re: [time-nuts] 10811A versus 10811-60111

Hi, I have had the occasion recently to measure the aging and short term stability of a bunch of oscillators. Measurements were against an EFOS-2 Hydrogen Maser. I thought that the results between 10811A (-60109 variant) and the 10811-60111 might be of interest to some. All oscillators had

Re: [time-nuts] 5061A question

Morris, The preheater would not be able to hold the oven at temp. The internal oven must be working or you would not be able to lock. Put the meter position to osc. oven, note reading, unplug unit for about one minute and then plug back in. The meter reading should peg or at least be noticably

Re: [time-nuts] 5061A ion pump P/S problem

Morris, You implied that you tested the spare module on the bench. You must connect the -side of the supply to the case of the module as well as the pin. (this occurs in the unit by its connection to the chassis) If you don't the supply floats and you will only read about 1/2 the voltage out.

Re: [time-nuts] 5062C power supply problem

Tim, You need to make sure the ion pump current has dropped to 10 on the meter or else the +18V supply is disabled. If it is high watch the 18 volt meter position and momentarily remove the A7 high voltage by pulling out the HV connector. If the +18 comes up then reconnect the HV and let the

Re: [time-nuts] Oscillators on eBay

Hi, I listed some frequency standard related items on eBay and will be listing some more in the next week or so. search items by seller corbymite Cheers! Corby Dawson Get credit card help today. Safe, fast, and easy. Click Now.

Re: [time-nuts] cesium Zeeman frequencies

The Zeeman frequency is calculated by the amount of C-field current you use. If you change the Zeeman then to get the unit on frequency you then have to change the synthesizer frequency and the C-field current to compensate. The amount of C-field change is too big for the front panel knobpot so a

Re: [time-nuts] 5061 c-field info

Bill, 2095 is indeed for 12.6317716 Mhz and a Zeeman of 42.82Khz. If you can't get splitting at 42.82 then change the synthesizer to 12.6317725Mhz and try again using 53.53Khz. If no splitting at 53.53 within the C-field dial range you will need to select a new resistor/s on the A15 board.

[time-nuts] HP5061A tube question

Hi, The tube is in a vacuum so the ovens heat only has roundabout physical paths to get to the outer case. If the tube feels warm at all at both ends the oven and hotwire are probably working OK. If you have a T type thermocouple temperature meter you can connect it to the copper and silver

Re: [time-nuts] 5065A problem

Jim, Connect a scope to TP2 an the bottom of the A7 module at .5V/cm. With the unit in open loop and the meter selection in error swing the fine and/or coarse oscillator adjust back and forth. You should see the error meter cross back and forth thru zero when the oscillator goes thru the

[time-nuts] HP K04 59991A Frequency multiplier comparator

Hi, Anyone have a manual or data on the HP K04 59991A Frequency multiplier comparator? Takes two 5Mhz inputs and outputs an error multiplied 10Khz. Thanks! Corby Dawson ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

[time-nuts] Hermetic Quartz oscillator

Hi, Saw the posts on humidity and hermetic oscillators. I have an HP 10811-60159 hermetic oscillator on ebay 320219546412 if anyone is interested. Also a lot with a bunch of Dud oscillators. Corby Dawson ___ time-nuts mailing list --

Re: [time-nuts] Symmetricom 4065B

Anyone out there have a maintenance manual for a 4065A or 4065B cesium standard? I especially need the pinouts of the cesium tube to make an adaptor for my cesium tube tester. Thanks, Corby Dawson [EMAIL PROTECTED] ___ time-nuts mailing list --

Re: [time-nuts] Foxboro pressure sensor question for maser

Hi, I am needing the documentation on how to hook up a Foxboro pressure sensor that is being used to measure the pressure out of a heated hydride Hydrogen source for a passive maser package. The maser package has no identifying logos or indication of who built it. It was built in the 1983 to

[time-nuts] 5060A acoustic noise issue

Brian, I once obtained a 5060A that was used in the time and frequency lab at HP. I guess it had sentimental value to them as they kept it going long after the 5061B had come out. It had a newer tube in it and more to the point it had one of the later 5061A/B style A11 oven controller modules

[time-nuts] 5071A tune evaluation #2

David, Forgot one thing. Once the unit has been running for an hour or so you should hook up a laptop to the RS232 port and run the profiling software. A good tube (in a good instrument as fault might not be the tubes!) will read in band 1 for both parameters, I can email you the program file

[time-nuts] BOULDER SCIENTIFIC 106D DUAL MIXER TIME DIFFERENCE SYSTEM

Bruce, Thanks! The info helps a lot. This unit appears to be an improved later version (1985 or so) of the unit in the PDF. It has two isolation amps that can be cabled in as well as a switch selectable delay line and a coarse and fine vernier phase adjust. The mixers are mini circuits vice

[time-nuts] HP 5370B question

Hi, Could a few of the 5370B owners connect the counters reference output to its counting input jack and with a 1 second gate let me know what the last 2 digits are doing? An earlier post implied that the last couple digits will wander around due to the way its designed. I'd like to know what a

[time-nuts] BOULDER SCIENTIFIC 106D DUAL MIXER TIME DIFFERENCE SYSTEM

I picked up a DMTD system on ebay. It's a BOULDER SCIENTIFIC 106D Anyone have any documentation or info. on this unit? Thanks! Corby DawsonltCurve.gif___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

[time-nuts] FRK-H question

Tim, It sound like your unit is locked. Power it off for 15 minutes and then monitor the Xtal control when powering back up. It should sweep from about 2 volts to 15 volts. Within 10 minutes it should stop sweeping indicating a lock. After being locked for a few hours adjust the Xtal trim cap

[time-nuts] 5065A cell flooding Typo!

); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Bill, OOOPs, Yes it was a typo! 5VDC and 5 ohm 10Watt is correct. Thanks for correcting me, I hope everone will see the correction! Best Regards, Corby ___ time-nuts mailing

[time-nuts] Post for time nuts forum Z3801A

); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Hi, I have couple HP double oven oscillators I am trying to evaluate for a project. Anyone have a spare board from the Z3801A that powers the outer oven? (It's the one with a couple DC to DC convertors on it.) I could try and build