Re: [time-nuts] Question about frequency counter testing

It appears that I replied to the wrong message, please ignore. Glenn On 5/27/2018 11:52 AM, Oleg Skydan wrote: Hi! From: "Magnus Danielson" You build two sums C and D, one is the phase-samples and the other is phase-samples scaled with their index n in the block.

Re: [time-nuts] Question about frequency counter testing

The MSDS is here: https://simplegreen.com/data-sheets/ They claim that it is non reactive and chemically stable. It is for water tolerant surfaces and should be rinsed. Probably due to the citric acid. Glenn On 5/27/2018 11:52 AM, Oleg Skydan wrote: Hi! From: "Magnus Danielson"

Re: [time-nuts] Weird Stuff WareHouse shutting down

The USB stuff has no front end and stability and calibration is highly questionable.. How can you discriminate between mixes within the USB device and the signal of interest? I will take my 141T or my 8566 over USB every time. Rather lug a little weight around and know what I am seeing on the

Re: [time-nuts] TV Signals as a frequency reference

I was a chief engineer for a TV station during the transition to digital. I am now a transmitter supervisor for two digital TV transmitters. None of the stations in my area have a frequency standard. Time in injected into the digital stream usually from a pc clock. This pc may or may not be

Re: [time-nuts] Symmetricom S200 PSU

Opto-isolators degrade with time. The "optically clear" material between the emitter and detector will start turning opaque with time. At least this is what my boss told me years ago. We has a product that used opto-isolators to isolate our circuits from phone lines. After a few years of use,

[time-nuts] Bulova crystal oscillator

I have a Bulova crystal oscillator, part number 1505869-1K, model number AMO31HP-V-1, NSN 6N5840-797-7659. The NSN tells me it is a little old and that it was a turn-in, probably repairable at some higher level. The frequency is marked 100.00 KHz. The oscillator voltage is 30 V DC and the

Re: [time-nuts] GPS Antenna Feed Line Decision

I work with a broadcast station. We just had a HD FM radio transmitter upgrade done. In the upgrade package from GatesAir was a GPS antenna with a F fitting. The provided feedline was RG-223 with a TNC on one end and a SMA on the other. Also provided was a TNC to F adapter. The new exciter has

Re: [time-nuts] Austron/ Systrom Donner 8181 Time Code Reader

Here is a calculator to determine the resistor value. You will probably have to provide an external supply, at the zener voltage, to know what the current draw is for the calculator. You might find that the original resistor value was too

Re: [time-nuts] HP 5275A

A 2N1038 is in a TO-5 or TO-11 package. A 2N1038-2 is a modified or selected part. Is this transistor pressed into a hexagonal bushing that is about 1/2 " long with a 10-32 threaded stud for mounting? If so the bushing/heatsink is part of the transistor. A google search for 2N1038 will show

Re: [time-nuts] ke5fx.com - something's up

Try the wayback machine: This is an archive of many websites. 73 Glenn WB4UIV On 9/10/2016 6:48 PM, Nick Sayer via time-nuts wrote: I tried to look for Lady Heather docs today, but it appears like the ke5fx domain is… funky.

Re: [time-nuts] GPS? Antenna

-26dBi-For-HUBER-SUHNER-84097323-/182012930579?hash=item2a60d0ea13:g:MAMAAOSwZd1Vdn6- Regards Karl 2016-09-06 5:12 GMT+02:00 Chris Waldrup <kd4...@gmail.com>: It's a Huber Suhner. Chris On Sep 5, 2016, at 21:26, Glenn Little WB4UIV < glennmaill...@bellsouth.net> wrote: Pete, I

[time-nuts] Datum TS2100 GPS issues

Is there a fix for the rollover problem for this instrument short of replacing the receiver? In searching the archives, this is the only solution that I see. Thanks 73 Glenn WB4UIV -- --- Glenn LittleARRL

[time-nuts] GPS? Antenna

At the last hamfest that I attended, I bought an antenna that looks like a GPS antenna. The price was right. This is a Nemko Article number: 84097323, Type number 1315.17.0018. It has a manufacturing date of 09/2012. Can anyone tell me if this is in fact a GPS antenna and what voltage wold be

Re: [time-nuts] GPS antenna selection - lightning

issue available for free? __ Clay Autery, KY5G MONTAC Enterprises (318) 518-1389 On 8/6/2016 8:46 AM, Glenn Little WB4UIV wrote: Cone of protection is addressed. Volume 1 is theory, volume 2 is application. The military requires 1/0 cable exterior to the building, comm

Re: [time-nuts] GPS antenna selection - lightning

f Of Glenn Little WB4UIV Sent: Friday, August 05, 2016 9:47 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts]GPS antenna selection - lightning A very good reference for EMP protection is MIL-HDBK-419. This is downloadable for a number of web sources. It is about

Re: [time-nuts] GPS antenna selection — lightning

A very good reference for EMP protection is MIL-HDBK-419. This is downloadable for a number of web sources. It is about 600 pages and is in two volumes. This discusses a number of different sources of EMP such as nuclear and lightning. A lot is for protection of military industrial complexes,

Re: [time-nuts] Q/noise of Earth as an oscillator

In navigation we used the earth rate of 15.04 degrees per hour. This was treated as a 'constant' even though it varied with wind, waves on the ocean and other things affecting the instantaneous rotational speed of the earth. How does this factor into leap seconds, or, does it? We accept that

Re: [time-nuts] Need - PRS10 magic smoke

My guess is the burned choke is in series with the Tantalum capacitor. This is a very common failure mode for these Tantalum capacitors. There are a number of things that will cause this failure. 1). power supply ripple too high (Tantalum capacitors do not like ripple). 2). Moisture absorbed by

Re: [time-nuts] When does NIST change to DST?

Does WWVB switch to DST, or, just set a bit in the data stream telling the device that receives the signal that DST is active? I seam to remember (that is dangerous) that WWVB data has GMT time encoded into the data stream and that it is up to the receiving device to display the correct offset

Re: [time-nuts] HP 10544A Repair

While in the navy, I had to repair a hp cesium standard. The control circuit had the oscillator slewed to one limit, I do not remember whether high or low. We had no spare parts to support this standard. The only option was to run the standard open loop. Over a period of two hours, I had the

[time-nuts] Reference OCXO

What would a shock mounted 10.08 MHz OCXO be user for? Just another nonstandard reference? Thanks 73 Glenn --- Glenn LittleARRL Technical Specialist QCWA LM 28417 Amateur Callsign: WB4UIV

Re: [time-nuts] RG 6 U couplings

If you do use 75 Ohm Type N connectors, do NOT attempt to mate them with a 50 Ohm connector. The center pins are different diameters to get the different impedance. To mate a 50 Ohm Type N male with a 75 Ohm female will guarantee destruction of the female connector. I have had to clean up

Re: [time-nuts] Time syncing WiFi routers using FM radio

The house standard in some stations are no more than LC oscillators. As long as the relative timing between signals is constant, you can do synchronous switching. All signals go through as dedicated frame synchronizer that is synchronized to house reference. At the last station that I worked

Re: [time-nuts] Clock Driver Design

Would an analog video distribution amplifier work? These are available cheap. TV stations used these eight or so in a frame. The frame had a power supply and the BNC i/o connectors. Each da would drive 6 or 8 outputs. 73 Glenn WB4UIV Retired TV CE. At 01:28 PM 9/26/2013, you wrote: I am

Re: [time-nuts] Warped back to 1993

With the wrong date and time, the GPS should not find almanac data, so will not lock. This was the problem caused by the 1024 week roll over problem. Are we possibly at week 2048?? 73 Glenn WB4UIV At 11:28 PM 8/10/2013, you wrote: ma...@non-stop.com.au said: Hal, I can't get it to take, I

[time-nuts] HP-117A

Are there any tricks to getting a HP 117A to lock to the current WWVB transmissions. I have read the thread for the Spectracom receivers. Will this work with the 117A? Thanks 73 Glenn WB4UIV ___ time-nuts mailing list -- time-nuts@febo.com To

Re: [time-nuts] Odd FTS 4060 Behavior

This is known as gold embrittlement. The gold has to be removed before a good solder connection is made. To remove the gold, tin the gold plated area. Desolder the tinning. Retin and remove the solder three times. This should remove the gold which forms an amalgam with the solder. After the gold

Re: [time-nuts] Achieving maximum performance when driving 5370A/B inputs

These were used on some measuring instruments to provide a balance 'guarded' input. The shield around the balanced conductors provided a ground between the DUT and the measuring equipment that was not connected to the input. IIRC this was for very low level signals. 73 Glenn WB4UIV At 10:06

Re: [time-nuts] ABC time signals in Tasmania/Australia wrong

If the TV station was transmitting digital and they were passing a network signal, a 5 second delay is possible. The network encodes the TV signal, then transmits it digitally. There is a finite amount of time involved with the digital encoding of the signal. There is a finite delay for the

Re: [time-nuts] Help identifying coax connector type

The larger push on connector is an SMP. This is used a lot in microwave for IF cables. This is a 75 Ohm connector. 73 Glenn WB4UIV At 03:38 AM 12/7/2009, you wrote: I have recently acquired a number of nice coax parts, but I'm not sure exactly what connector types they are. If anybody can

[time-nuts] Z3801A Power Supply

Does anyone have a schematic for the Z3801A internal voltage converter board? I will attempt to reverse engineer it if one is not available. 73 Glenn WB4UIV ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] The Demise of LORAN (was Re: Reference oscillator accuracy)

And all the GPS goodness can easily be disabled by a missile and a near nuclear burst or a portable handheld jammer at the airport. The portable handheld jammer is a very real threat to GPS due to the signal levels from the satellite. Now they are trying to revive a miswired SVN and add it to

[time-nuts] Setting Oscillator Frequency

I just got a system that allows me to compare the phase difference between a reference and an external oscillator. I am using a Vectron oscillator installed in a HP 5345A counter as the external oscillator and a PTB-100 as the reference. How close to the reference should I be able to set the

[time-nuts] Reference oscillator accuracy

While I was in the US Navy we had two Cesium standards for the navigation center on SSBN submarines. While in port, we would track LORAN C and compute the drift rate of the two cesium standards. Is there a service, that has drift rates published, that I can compare my standards to, so that I

[time-nuts] Rubidium standard

I was told by a Technical Support Engineer from Symmetricom Global Services that The typical life span is ~10 years for these Rubidium Time Bases. This is in response to my request for information on a Ball/Efratom PTB-100. Is this a typical life span of a rubidium standard? Do some standards

[time-nuts] WWV Clock

My WWV clock at home and the master clock at the TV station that I am engineer for did not update to EST from EDT. Did anyone else see their WWV clock not change time for DST? Thanks 73 Glenn WB4UIV ___ time-nuts mailing list -- time-nuts@febo.com

Re: [time-nuts] OT: Spectrum Analyzer

Keep in mind that anything much newer than the 141T will have custom parts and processors. This makes the instrument smaller and more versatile, but, less repairable. The 141T is a workhorse. I would not trade mine for any number of the processor controlled analyzers. Having a nice clean analog

[time-nuts] Oscillator comparison

I have just recently bought a working HP 5345A counter. Much to my surprise, I find that the oscillator is a Vectron 2810007-11. The early 5345A counters used a 10544 oscillator, while the later ones used a 10811. Can any one tell me what the real difference, in operation, is between the HP 10544

Re: [time-nuts] Gold plating on aluminum

To plate gold on copper requires the copper be first nickle plated. Then the gold is plated onto the nickle. Gold will not directly plate on copper. 73 Glenn WB4UIV At 03:36 PM 10/20/2009, you wrote: In message 80f9fcf76d3642698820a10169603...@pc755913417801, Nic McLean writ es: If you wish

Re: [time-nuts] hp10811 OCXO shipping jolt/drop survival?

A 4.35 milli-Hertz(mHz)deviation is not bad at all. If you meant 4.35 Mega-Hertz (MHz). There are a few orders of magnitude between these (10^-3 to 10^6). The proper use of units is important. In some cases this improper use of units can be understood due to the wrong units cannot apply. In

Re: [time-nuts] HP 106B part no.

1854-0003 is a good part number. I have a few here that were removed from equipment. Possibly someone with the proper equipment could characterize this part and determine a suitable parametric substitute. 73 Glenn WB4UIV At 11:43 AM 8/9/2009, you wrote: Double check: Q11 is marked as

Re: [time-nuts] Time/freq from digital TV

The digital transmitter could have a GPS based frequency reference. I am the CE for a local station (WCIV). We do not use any standard other than what is installed in the transmitter. I have not verified it, but, I think that the UHF transmitter frequency is controlled by an OCXO. I will try

Re: [time-nuts] Time Signals on TV signals

It appears that the time information is transmitted in line 21 of the analog TV signal. This is the same line that carries Close Captions in an analog signal. It further appears that PBS is the major carrier of these time signals. See :

Re: [time-nuts] WTB: 10 Volt L1 L2 GPS Antenna

You could put a regulator on the voltage line for the antenna so that you could use a 5 Volt antenna. This would get you away from the specific voltage requirements for their antenna. 73 Glenn WB4UIV At 09:54 PM 5/20/2009, you wrote: Hi: I just got an Ashtech Z-12-R Reference Station and

Re: [time-nuts] fleabay cesium

When I was serving in the US Navy we quit using Rubidium standards for Submarine radio and started using Cesium standards. We also had a pair of Cesium standards that were used for timing in the navigation system. I was told that the change was due to the Cesium had better long term stability

Re: [time-nuts] Datum/Trimble 9390

I have a 9390-5593 that does not display the correct date. The GPS engine uses two processors and three ROMS. These are glued together with an ASIC. I contacted Trimble and they cannot identify their engine. I have read the ROMs and am in the process of disassembling the code. This is slow. I

[time-nuts] Motorola KXN1132AA

Recently there was a post about oscillator stability and I thing drift over time. Was the large Motorola oscillator the one in the subject line? Further markings on the oscillator are source code 9896, Cust No 48R83851N02. This is a 5 MHz operating frequency oscillator. There are 8 lugs to

Re: [time-nuts] Motorola KXN1132AA

some complexity. Can you post an image of the oscillator? Bruce Glenn Little WB4UIV wrote: The oscillator was bought as part of a scrapped Motorola base station. I was told that it was a PURC. The only leads attached to the oscillator are the power and the BNC output connector. Would

[time-nuts] LPRO-101

I have a LPRO-101. Before I power it up, I have been advised to use a heatsink. How large of a heatsink do I need? I found an extruded heatsink in the junk box. This heatsink has fins about 0.50 inches high. The width is 2.375 inches wide. It is 8.125 inches long. I plan to cut this heatsink in

Re: [time-nuts] LPRO-101

My heatsink appears to have a thermal resistance of about 3 degrees C per watt. It is similar to Thermalloy 60975. I will dig deeper into the junk box and see if I can find a heatsink with larger fins. Thanks for the guidance. 73 Glenn WB4UIV At 11:50 PM 1/11/2009, you wrote: Glenn Little

Re: [time-nuts] Another LPRO-101 Rb Osc question...

Note the position of the connector. This is really a filter plate with leads that also extend into the connector on the oscillator. Remove the two spacer nuts. Pull the filter plate out. Remove the cover. When you reassemble the cover, make sure that you install the filter plate correctly. I

Re: [time-nuts] Build my own dist. amp ??

With TV stations shifting to digital, how would a surplus analog video distribution amplifier do? There should be a lot of high end amplifiers made by Grass Valley (Tektronix) available soon. These are used in a frame. The input loops through the frame. Each amplifier has 6 isolated outputs.

Re: [time-nuts] Help with HP 8640B generator

What is the part number of the chip that you need? Do you have a way to remove the bad chip? I have a parts board that I could remove the chip that you need from and ship it to you. I cannot guarantee that the chip that I have is good. If there are two on the board, I could remove both and send

Re: [time-nuts] 468-DC NBS Time receiver

From: Glenn Little WB4UIV [EMAIL PROTECTED] To: Time-Nuts list time-nuts@febo.com Sent: Monday, May 26, 2008 10:43:26 PM Subject: [time-nuts] 468-DC NBS Time receiver I found one of these in my stuff. Is it good for anything but parts? As I understand it, the service that this received has been shut

[time-nuts] 468-DC NBS Time receiver

I found one of these in my stuff. Is it good for anything but parts? As I understand it, the service that this received has been shut down. Thanks 73 Glenn WB4UIV ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

[time-nuts] Thunderbolt Buy

I would like to be placed on the list for one of these if possible. Thank you 73 Glenn Little WB4UIV ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow

Re: [time-nuts] Robert G8RPI -- Odetics 325 PSU

Roy and the group SMPS have a very classic failure mode. As the design is finalized by a bean counter, and/or the person that designed the SMPS was not qualified to do so, we have capacitors pushed beyond what they were designed for. If you are lucky, the electrolytic capacitors are 105

[time-nuts] week 1024 roll over

I recently bought a Datum GPS Time/frequency System 9390-5593. When I enter date, time and location, it fails to indicate GPS lock. It is indicating GPS week 451, when the week is really 1475. It is also indicating that the day is 246. I highly suspect that the receiver has firmware that needs

[time-nuts] Datum GPS Time/Frequency System

I am new to the list. I checked the archives, but found no information on this equipment. Does anyone have information on a Datum 9390-5593? I bought one at a hamfest and would like to modify it for a 10 MHz out. I suspect that I can intercept the Rb standard output with a distribution