Re: [time-nuts] Inside of FT1200-100

Christopher, Enjoyed the pictures. You might want to look at these items on theBay. 381408412092 311736541103 I've had the same issue and broke down and bought a set of these small nut drivers. Good luck. Joe -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On

Re: [time-nuts] Inside of FT1200-100

Christopher wrote: Despite running out the three sloted screws on the "top" around the circumference, I'm not into the inside yet. I don't have the right thin-walled socket to remove the nuts at the opposite end. It looks like a standard 5/32" nut driver will work fine.

[time-nuts] HP 55300A

I recently got a HP55300A on ebay for parts. It works fine but runs on 48V. I am going to install a AC supply inside and also place a fan on the top for cooling. I hope the air flow will not cool the OCXO too much. I am also looking for documentation. I have the User manual but am looking f

Re: [time-nuts] Need for a document comparing time interval counters

Hi Once you get into used gear that is many decades old, the actual performance of *your* counter is likely to be different than the performance of mine. If you are willing to go through all of the detailed alignment steps (and possibly replace parts) yours will work better than mine. How muc

Re: [time-nuts] HP 55300A

Hi At normal room temperatures, you simply can not run enough air past the OCXO to “cool it to much”. The OCXO heater will simply put out a bit more power as you increase the air flow. That’s not to say that the performance will improve any as the OCXO is quickly following any twitch or bump in

[time-nuts] 53132 replacement fan

Does anyone have a part number for the 53132 fan (or equivalent)? Mine is getting pretty noisy. Thanks! John ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the

[time-nuts] L1 L2 choke Ring Question

I recently purchased a used L1 L2 Choke ring antenna AeroAntenna AT2775-20W-000-05-26-NM, it has an AT2775 aircraft antenna with a 3.3" x 1.8" bolt pattern at it's heart. Sadly the antenna is dead. I have been looking into the possibility of replacing the aircraft antenna portion and was wonder

Re: [time-nuts] 53132 replacement fan

Hi John, I have a copy of the Agilent 53132 components list from 2007, but it seems to only cover the circuit boards :-( Anyway, for what its worth, I have put it in my dropbox as it is a 3.2 megabyte PDF - see: https://www.dropbox.com/s/f9qd42g6qr5cnhx/HP53132A%20Components%205989-6308EN.

Re: [time-nuts] L1 L2 choke Ring Question

Tom, If I recall correctly, that antenna element is passive and I expect there to be an amplifier there. The antenna element you can find separately on ebay. Cheers, Magnus On 11/20/2016 08:48 PM, Tom Knox wrote: I recently purchased a used L1 L2 Choke ring antenna AeroAntenna AT2775-20W-00

Re: [time-nuts] L1 L2 choke Ring Question

On Sun, 20 Nov 2016 19:48:42 + Tom Knox wrote: > I recently purchased a used L1 L2 Choke ring antenna AeroAntenna > AT2775-20W-000-05-26-NM, it has an AT2775 aircraft antenna with a 3.3" x > 1.8" bolt pattern at it's heart. Do you have pictures of the antenna module? Have you tried to take

Re: [time-nuts] 53132 replacement fan

Hi John; There is a good chance I have the exact fan. I will check later today and let you know. If I do have it I well send you one. At least I should be able to find the Agilent and manufacturer part number . Cheers; Thomas Knox Sr Test and Measurement Engineer Boulder Colorado 80305 1-303-5

Re: [time-nuts] L1 L2 choke Ring Question

Hi, There is(was) a 26dB lna in that antenna. --    Björn Sent from my smartphone. Original message From: Magnus Danielson Date: 20/11/2016 21:42 (GMT+01:00) To: time-nuts@febo.com Cc: mag...@rubidium.se Subject: Re: [time-nuts] L1 L2 choke Ring Question Tom, If I recall c

[time-nuts] Nortel GPS hard to hold lock reciently

I have a Nortel/Trimble GPSDO which has been holding lock for the last month – at least it’s been in lock whenever I have thought to check it. But it seems like for the last several days LH has been indicating “RECOVERY MODE” or “OCXO COMP” instead of PHASE LOCKED. Appreciate any suggestions

[time-nuts] Rohde & Schwarz XSD 2.5 MHz crystal gone bad?

Hi there, I'm new to this list and have some interest in quartz crystal and rubidium oscillators - GPS, NTP, PPS and "clock watching" in general ;-) I snatched an R&S XSD frequency standard accompanied by an XKE frequency controller. Found the manuals on KO4BB's site (Thanks a lot for that! BTW t

[time-nuts] How can I measure GPS Antenna quality?

Is that even a sensible question? Is there a better way to phrase it? The problem I'm trying to avoid is that the weather and the satellite geometry change over time so I can't just collect data for X hours, switch to the other antenna or move the antenna to another location, collect more dat

Re: [time-nuts] Rohde & Schwarz XSD 2.5 MHz crystal gone bad?

Michael a couple of wild thoughts, make sure there is no 500kHz there (this is the crystal fundamental and the maintaining circuit should be degenerative there. (Is it a Meecham Bridge?) That sounds like a baseless IO GT valve (tube in US ) enclosure which was probably originally evacuated

Re: [time-nuts] Rohde & Schwarz XSD 2.5 MHz crystal gone bad?

http://www.classicbroadcast.de/downloads/rohde_XSD.pdf Greetings, I am surprised that this is the 2.5 MHz (XSD)and not the new 5 Mhz crystal. XSD2 ) Bernd Neubig , on distribution always has a wealth of information and part. There was a later R&S ( XSD 2 ) 5 MHz frequency standard,

Re: [time-nuts] 53132 replacement fan

I was able to cross it easily to a well-known fan manufacturer's part. If someone doesn't chime in, I'll dig through my notes and get you the details. -christopher. 73 de AI6KG On Sun, Nov 20, 2016 at 11:14 AM, John Ackermann N8UR wrote: > Does anyone have a part number for the 53132 fan (or eq

Re: [time-nuts] How can I measure GPS Antenna quality?

You need a definition of "Quality" to work with. One definition might be "does it meet published specs? under what conditions?" Another definition might be associated with reliability and ruggedness. Longevity in outdoor conditions. Another might be with the antenna supporting your use case. Anoth

Re: [time-nuts] How can I measure GPS Antenna quality?

Hi Hal, That's a very sensible question. I've often wondered the same, but I'm embarrassed to say I have never done a thorough job with it. You know the constellation repeats approximately every 24 hours so you want your X hours to be a multiple of days. Looking at SNR seems obvious and may ev

Re: [time-nuts] How can I measure GPS Antenna quality?

If you run two antenna simultaneously then... 1) they both can't be at the same location and 2) What if the two antenna interfere one with the other. I think maybe you need to collect data over a long enough period of tine that wether averages out. the satellite tracks repeate pretty much exact

Re: [time-nuts] Rohde & Schwarz XSD 2.5 MHz crystal gone bad?

Is your oven doing what it is supposed to be doing? Sounds more like an oven problem than a crystal problem. --- Graham == On Sun, Nov 20, 2016 at 7:00 PM, Alan Melia wrote: > Michael a couple of wild thoughts, make sure there is no 500kHz there > (this is the crystal fundamental and the main

Re: [time-nuts] Rohde & Schwarz XSD 2.5 MHz crystal gone bad?

"that should cause lowering the frequency" and it will lower the Q of the crystal too, therefore it will need more drive! 73 KJ6UHN Alex On 11/20/2016 5:00 PM, Alan Melia wrote: Michael a couple of wild thoughts, make sure there is no 500kHz there (this is the crystal fundamental and the ma

Re: [time-nuts] Rohde & Schwarz XSD 2.5 MHz crystal gone bad?

Hi If the frequency drops as the oven warms up, you have an AT cut crystal. If the frequency goes up as the oven warms up, you have a BT cut crystal. With an AT or a BT, the frequency change between room and “hot” will depend a lot on the details of the proper oven temperature. A frequency shif

Re: [time-nuts] 53132 replacement fan

Hi John; The exact part in a 2010 Agilent 53132A is EFB0412MD 12VDC 0.10A Brushless motor. Operating Supply Voltage12 VDC Airflow7.17 CFM Speed6300 RPM Pressure Type5.5 mmAq Bearing TypeBall Noise24 dBA Power Rating0.72 W Housing MaterialPlastic TypeD Height40 mmLength40 mm I have a FB

Re: [time-nuts] How can I measure GPS Antenna quality?

> Le 21 nov. 2016 à 02:57, Tom Van Baak a écrit : > > Hi Hal, > > That's a very sensible question. I've often wondered the same, but I'm > embarrassed to say I have never done a thorough job with it. You know the > constellation repeats approximately every 24 hours so you want your X hours >

[time-nuts] How can I measure GPS Antenna quality?

When I was developing the precision survey code for Lady Heather, I used a lot of antennas. My definition of antenna quality boiled down to how well the results of a 48 hour survey compared to the cm level survey point that I had for my antenna position (from a Ashtech Z12 receiver / matched c