Hp Gpsdo, I let the HP unit warm up for 3 hours thinking maybe it was

Hp Gpsdo, I let the HP unit warm up for 3 hours thinking maybe it was cold and would come back in tolerance. A GPS driving an OCXO maks it an GPSDO - the phase noise is then directly related to the quality of the OCXO being driven. A GPS-disciplined oscillator is just that -- an ovenized UCCM-P > *IDN? Symmetricom,090-03861-03,W56094xxxx,1. As far as aging, I'll continue to run this experiment until I see several days of consistent output. So, anyone here having experience with the 53132A and it's problems? HP 3586 If you do not need the kind of precision and accuracy provided by a GPSDO, the next best thing I can recommend is to find an HP 3586 Selective Voltmeter (Ref 3). At the end there will be a calibration and comparison to my HP GPSDO with my 53230A counter. The procedure is very simple: just throw the output of a GT300 and the GPSDO on an oscilloscope and turn the potentiometer until the 2 waveforms are static against each other. Spent a few minutes probing around just now, and it appears I've got a power supply issue in the Both measurements are with the HP Z3805A as ext. Find many great new & used options and get the best deals for Agilent/HP 53131 53132 53181 (OPTION 010) GPS Disciplined timebase GPSDO at the best online prices at eBay! Free shipping for many products! Be a bit careful with a HP/Ag/KS 53230, the input BNCs are mounted directly on the PCB and it the signal trace line can end up fractured, esp on Channel A; if out of warranty (as mine was!!!!!) HP has kindly left a small SMD pad so you can solder the bodge without having to dismount the PCB. I had to pay too much, but wanted one to verify Lady Heather's support for the HP GPSDO's. Comes w/active antenna, data, RF, and power interface cables. 2-01 Command Complete I believe these were used in GSM/UMTS/CDMA base stations. Photo of my bodge! Interesting and good to know. Products Adaptable Solutions for Your Resilient Positioning, Navigation, and Timing Needs Safran provides standard products, configurable solutions, and Related Disciplined Oscillator Patents HP E1938 Ovenized Crystal Oscillator HP Z3805A Time & Frequency GPS Receiver GPSDO Trimble ThunderBolt Timing GPS Receiver GPSDO CSI LGBX Pro DGPS Receiver FEI Frequency Standards Navigation GPS antennas at DAGR and Trimpack PSN-8 VSN-8 GPS receiver PSN-9 GPS receiver PSN-10 SLGR GPS receiver (Trimpack) Re: HP Z3815A GPSDO « Reply #5 on: July 06, 2016, 01:55:15 am » Vgkid, Yes, twas I. Note that its loop time constant is longer than the others, probably a couple of thousand seconds. First a GPSDO could be Rubidium anyway, but assuming that the assumption is a GPSDO is an OCXO based one they have a number of advantages: 1. I believe it identifies as a Z3801A. DATUM STARLOC II GPSDO NEC GPSDO (STAR-4 compatible) GPSD interface Jupiter-T (aka Zodiac) Lucent KS24361 REF0/Z3811A (19200:8:N:1) Motorola binary format Generic NMEA receiver Trimble Resolution T family with odd parity Sirf binary Generic Trimble TSIP binary Ublox UBX binary Venus mixed binary / NMEA Nortel SCPI-compatible GPSDOs (NTWB, NTPX The plots below depict a 3-day simultaneous comparison between a BG7TBL GPSDO, a modified Trimble Thunderbolt GPSDO, and an HP 5071A cesium-beam primary standard. UPDATE Feb-2023: I'm working on a new method to measure the GPSDO by using a reciprocal counter. ) The phase noise will probably be better. The design makes a lot of sense to me, and satisfies my need (OK, maybe not so much a need, but "hey wouldn't that be cool!" want) for an accurate 10MHz reference for my HP 5345A counters. Some of the HP units (not sure which one, there are many GPSDO models) have issues with the GPS date. Hewlett Packard GPS Receiver Z3805A GPSDO 10MHz 外観が貧相な韓国Sammusung仕様品ではなく、人気の高い中国携帯電話基地局仕様品です。 見栄えが良いですね。 オーディオマニアの方がマスタークロック源として是非使いたいとのことで、この春に売却したZ3805Aです。 An increasing number of calibration and metrology laboratories now employ a Global Positioning System disciplined oscillator (GPSDO) as their primary standard for frequency. Jan 19, 2025 · What I like about this Leo Bodnar GPSDO is that you can change the output frequency to any value between 1 Hz and 1. A real world GPSDO, such as a HP Z3801A or Trimble Thunderbolt, compares time pulses delivered by GPS receiver board with time pulses derived from a 10 MHz OCXO and slowly adjusts the frequency of the OCXO to minimize the phase difference. Simulating GPS averaging algorithms, 1PPS phase detector, tuning algorithms, EFC and DAC are all possible. . These attributes make them an attractive choice The other day I had my second HP 3586B power supply board smoked. Uses an N connector for Themis is an HPSDR GPS_disciplined_oscillator (GPSDO) design that is an experimental approach for disciplining Crystal Oven (OCXO) OCXO's and provides 1PPS, 10MHz, and GPS Timestamping to the Atlas Bus for the HPSDR System. Introduction Every few years a couple of old or new companies come up with a fresh GPSDO product. Will run software to plot real-time GPS satellites location and signal st… An increasing number of calibration and metrology laboratories now employ a Global Positioning System disciplined oscillator (GPSDO) as their primary standard for frequency. The term “ GPSDO ” is becoming more popular as it’s becoming a more reliable and accurate source of timing for many different applications including GNSS and GPS applications. Date 1 - 20 of 26 GPSDO connected to external ref inputs GPSDO 10MHz Test assem­bly with a GNSS2, GPS from MikroElectronika After get­ting every­thing work­ing on the bench, it was time to mod­i­fy the Extron dis­tri­b­u­tion board with 50 ohm ter­mi­na­tor resis­tors and install all the parts in the case. When I connected the frequency counter to the 10 MHz GPSDO, it was -2. Gate Time is 1 second in a 12-hour period. Years previously I had built a GPSDO for my home lab, based around a venerable HP 106B Quartz Oscillator that I found, partially disassembled, at a local surplus store. 4. As part of the same run, I also measured my HP/Symmetricom Z3805A GPSDO that’s known to be quite good, and a Leo Bodnar “Precision Frequency Reference” GPSDO (the two-output version). At bootup it goes through several states : OCXO WARMUP OCXO WARM ACTIVE The ACT LED corresponds to the PLL lock : Green solid : PLL unlocked Green flashing slowly Finally, the cyan trace is a surplus HP/Agilent/Symmetricom Z3805A that has the best short term stability of the bunch thanks to its excellent OCXO. Most of the performance information published about these units has been comparing the raw oscillators. 3. ) The power consumption should be less. A GPSDO aims to utilize the best of both sources, combining the short-term stability performance of the oscillator with the long-term stability of the GPS signals to give a reference source with excellent overall stability characteristics. The output level is +13 dBm (per data sheet) with low phase noise, making it an excellent portable signal generator. 基準10MHzの味見記録 其の参-え GPS Time and Frequency Reference Receiver HP 58503A GPSDO 10MHz 動作NGとして引き取った58503Aなのであるが、途中筆者の半年入院があったこともあり、およそ1年掛かりの修理+動作Reviewとなってしまった。 I recently got in an HP-58503B GPSDO from a local equipment liquidation auction. The HP 3586 is actually a very precise and accurate HF receiver, working from 200 Hz to 32 MHz that was made by Hewlett Packard in the early 1980's. 4 GHz. UPDATE Dec-2023: During 2023, I worked on improvements to the version 1. HP Z3801A SmartClock GPSDO This is a classic HP Z3801A SmartClock (similar to 58503A and 58503B), a gold standard among the ham radio and amateur time & frequency crowd due to its superb performance and availability on the surplus market. 改造して組み上げた写真です。 GPSDO基板にはMV89A等のOCXOを載せられるようにしていましたが、スペースが無駄ですね。 基板は150x100mmの大きさですが、少し大きいと感じていましたので、OCXOの部分を除いて小さくした基板をその内につくってみたいと思います。 拙作のGPSDOでは、OCXOにMorion MV89Aを使っていました。 テスト版としてMV89Aの代わりにhp 10811Eが使えるようにしたF/Wを作りましたが、自分では動作確認ができていませんでした。 今回、hp 1… 続きを読む » As mentioned, the strength of the GPSDO is the long term stability. Provides a very nice 10 MHz signal. A rubidium oscillator on its own (some are basically the output straight from it, some are buffered by disciplining an GPSDO Table of contents The GPSDO program is a GPS Disciplined Oscillator program that turns the RFzero into a reference oscillator. At first, I thought perhaps the GPSDO was off; however, the spec for the LBE-1420 is 1 x 10 -12 with a resolution of 1 Micro Hz. The GPSDO works by disciplining (or steering) the I have two HP Z3801A GPSDO and recently acquired two of the "Time-Nuts Special" Trimble Thunderbolt units. What this all means is that a GPSDO provides excellent accuracy, but does not improve short term stability or phase noise -- those will usually be optimized in a stand-alone crystal oscillator. 2. The underlying issue is the GPS year is a small range of bits and it cannot hold 2016. These attributes make them an attractive choice 1. GPSDOs have the advantage of costing much less than cesium standards, and they serve as “self-calibrating” standards that should not require adjustment or calibration. HP Z3801A GPSDO: Works perfectly. There was a log in my unit, latest GPS fix was located at the top of a high building in Japan. In the September/October 2006 Issue of QEX features a manuscript by Bertrand Zauhar, VE2ZAZ titled A Simplified GPS-Derived 10MHz Frequency Standard. The "Fury" is a new, compact GPSDO (GPS Disciplined Oscillator) from Jackson Labs, a newcomer to the Time & Frequency market. It’s doable to tune the output with 9 digits of accuracy that way. Very accurate 10MHz output. 0 that I describe below. It’s a very good GPSDO. It still may be dropping but more slowly I'm soon getting a BG7TBL GPSDO from 2018-01, his distribution amplifier (to connect the GPSDO to my HP 5345A, and Siglent 1032X) and the FA-2 counter (that I will also use with the GPSDO as his reference). Off Topic : What is the 10 second accuracy of a Trimble 57963-D GPSDO? My house reference is an HP GPSDO. They are both the HP units, not the CIC units. With all four running in my basement off the same GPS antenna, I decided to see how they compared, both brand-to-brand and against each other. I've been a long time lurker on the list. The frequency accuracy of the GPSDO is essentially that of GPS, plus or minus the short term stability of the crystal oscillator. It burned both the PC board traces and the connector on the motherboard so badly it will have to be replaced. but not when I brought it home. HP/Nortel GPSDO, commonly used in cellsites for timing. Has no gps rollover issues. Date 1 - 20 of 26 GPSDO connected to external ref inputs Both measurements are with the HP Z3805A as ext. Nope, the frequency stayed about 2 Hz low. reference, and the Oscilloquartz Star4+ GPSDO on Input B to the counter. Requires ~ 28 volts DC for operation. There is a specific post on my Blog where I also try out a few improvements for the GPSDO not yet described described in this post. Both the raw cards, not the packaged versions. 1 Hz off. GPS 10 MHz Reference FS740 — GPSDO and frequency counter FS740 from $4800 BUY / QUOTE EEVblog Captcha We have seen a lot of robot like traffic coming from your IP range, please confirm you're not a robot 10MHz GPSDO を組み立てる その4（ケース作成とログ） 10MHz GPSDOを組み立てる 第4回目は、一番時間のかかるケースの作製とログの分析です。 ケースはHPのジャンクの計測器を使いました。 Themis is an HPSDR GPS_disciplined_oscillator (GPSDO) design that is an experimental approach for disciplining Crystal Oven (OCXO) OCXO's and provides 1PPS, 10MHz, and GPS Timestamping to the Atlas Bus for the HPSDR System. Oct 20, 2015 · Using one GPSDO for the FS700 reference, I can then compare my other GPSDO for Phase, and Frequency over time, using the FS700 Phase, and Frequency Comparator Display. ) The 1PPS should be synced HP Z3801A GPSDO: Works perfectly. Look here. This is a Listing page for HWC LLC (Hollywood Controls). This is a massive improvement, easily verified by noting significantly less wander in TBoltMon's PPS and ppb timing output fields. ) The frequency will not drift at all and be very accurate as an average value at least. Telecom GPSDOs, which are most of the cheap surplus units, still have decent oscillators and general performance, but the real benefit to be had is the self-correction to essentially zero out long term drift. It powered up at the equipment auction preview. GPS Disciplined Oscillators (GPSDO) are powerful devices (sometimes called GPS clocks) that consist of a high-quality stable oscillator and a GPS receiver. Both GPSDO's were on the same HP timing antenna via a splitter (I plan on getting an amplified antenna splitter, but the passive one seemed to work fine). 10MHz GPSDO を組み立てる 第7回目は、安定度が低かった OCXO を HP 10811E に交換しました。自宅にある中で最高度の安定を誇るオシレータに交換したところ良い感じになりました。（GPSDO のオリジナルは、honkytonk さん） このGPSDOでは、FLLである程度周波数を合わせこみ、その後PLLに切り替えるハイブリッド方式としました。 GPSDOの自作例を見ると単一のFLL方式やPLL方式が多いようで、私のようなハイブリッド方式はあまり見かけません。 改造して組み上げた写真です。 GPSDO基板にはMV89A等のOCXOを載せられるようにしていましたが、スペースが無駄ですね。 基板は150x100mmの大きさですが、少し大きいと感じていましたので、OCXOの部分を除いて小さくした基板をその内につくってみたいと思います。 拙作のGPSDOでは、OCXOにMorion MV89Aを使っていました。 テスト版としてMV89Aの代わりにhp 10811Eが使えるようにしたF/Wを作りましたが、自分では動作確認ができていませんでした。 今回、hp 1… 続きを読む » In my case, I calibrated the GT300 against my TM4313 GPSDO that had been running for a couple of days. Recently re-subscribed. The 5370A is a really nice instrument, and god if I love those HP buttons ! I still want to get myself a 3456a, but it's hard to get one with decent shipping here (france). Data was collected using a Prolific GPIB-USB dongle and EZGPIB, setting the counter to a 10 second gate time. By contrast, a GPSDO is a hybrid device that relies on a relatively cheap oscillator that is very accurate in the short term and can be gently nudged (disciplined) into line in the long term by a time signal received from GPS satellites. 0. This only relates to the 10Mhz output. 4sec gate time), 2512 measurements comes to almost exactly 24 hours. Has a serial port and will communicate nicely via serial port with LadyHeather to monitor everything. Nov 28, 2020 · The HP Z3801A is probably the most common GPSDO out there. The RFzero is capable of generating signals beyond 280 MHz. GPSDO locked, HP 53132 with HP Option 010 HS oven with the following settings; Gate set to 11 digits (34. Will run software to plot real-time GPS satellites location and signal st… As seen in the phase noise plot below, the replacement HP 10811-60111 OCXO is more than 25 dB cleaner than the original part at 1 Hz. This way you can lock your instruments and radio equipment to a common frequency typically 10 MHz. layb, exeh, 4cuo, tlpdv, h8fnsc, al1ok, covzi, 8eqcd, pl6k, nakb,