Re: [time-nuts] What's the best way to double 10 MHz to 20 MHz ?
Hi Dave, Use a diode doubler, follwed by a 20MHz filter and a MMIC /attenuator combination to allow you to set the level. If you need more detail, e-mail me directly and I'll provide. 73, Dave From: Dr. David Kirkby david.kir...@onetel.net To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Wednesday, 25 May, 2011 8:52:12 Subject: [time-nuts] What's the best way to double 10 MHz to 20 MHz ? I'm still trying to find a solution to replacing a standard crystal in a Kenwood TS-940S transceiver with something more accurate. The transceiver uses a 20 MHz crystal oscillator, though a 20 MHz TCXO was available as an option, though few rigs appear to be fitted with it. If one was to make a 20 MHz reference, what's the best way to get a 20 MHz sine wave (at least 0 dBm) from a 10 MHz TCXO or OCXO? The 10 MHz devices seem much more popular than 20 MHz ones, so I can probably pick a higher spec 10 MHz device more easily. Dave -- A: Because it messes up the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail? ___ 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 instructions there. ___ 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 instructions there.
Re: [time-nuts] Distribution amp
Have a look at http://g4hup.com/DA/DA1_4.htm. These have been quite popular this year so far - maybe because the TAPR unit is temporarily unavailable? 73, Dave, G4HUP From: Bob Bownes bow...@gmail.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Monday, 9 May, 2011 16:17:01 Subject: [time-nuts] Distribution amp I know it has come up in the past so I thought I would check here before hunting one down in the outside world. Anyone have a suitable distribution amplifier that they are looking to part with? My consumer device count has exceeded my source capability. :) Please respond offline, save a few electrons. Thanks, Bob KI2L ___ 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 instructions there. ___ 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 instructions there.
Re: [time-nuts] was there ever a conclusion on distribution amps ?
Have a look at http://g4hup.com/DA/DA.htm These are still available! 73, Dave, G4HUP From: Bob Camp li...@rtty.us To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Wednesday, 23 February, 2011 18:11:16 Subject: Re: [time-nuts] was there ever a conclusion on distribution amps ? Hi Since it's in the no longer available category, it may not be much of a solution. Not much need to upgrade for most of what you will be running. Another question would be weather you local standard is good to 1x10^-11 at 1 second. If it's not, then that might be the place to put your money. Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Pete Lancashire Sent: Wednesday, February 23, 2011 1:07 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] was there ever a conclusion on distribution amps ? just to get going until can 'upgrade' to something better. The TAPR was pretty cheap, but quite well though out like most of their stuff. -pete On Wed, Feb 23, 2011 at 10:03 AM, Bob Camp li...@rtty.us wrote: Hi That would be the video amp alternative. Works fine at some level. I don't have one so I'm only guessing that it's in the 2x10^-11 at 1 second range. I would be very surprised if it's not though. Is that good enough for the gear you have? I certainly have not seen much stuff that would be unhappy with a standard at that level. This being Time Nuts, you do have to ask One other area that would limit you - if you are trying to multiply directly up to microwave off of the 10 MHz, then that's a special case as well. Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Pete Lancashire Sent: Wednesday, February 23, 2011 12:52 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] was there ever a conclusion on distribution amps ? was thinking along the lines of this (now discontinued) http://www.tapr.org/kits_tadd-1.html On Wed, Feb 23, 2011 at 8:51 AM, Bob Camp li...@rtty.us wrote: Hi How good a 10 MHz do you need noise wise? If the stuff is common lab gear, there are a bunch of ways to go. If you are driving dual mixer setups then your choices narrow down a bit. Having stuff on one bench (and ground) is easier than running cables hundreds of feet. Assuming it's normal lab gear on one bench: Sixteen port power splitters from a junk pile should have about 12 db of loss. Run about 100 mw / 20 dbm into it and you will have plenty of signal to run normal lab gear. An ACMOS hex (or octal) buffer based amp can give you that sort of power. Having the logic levels also helps get to 1 and 5 MHz. Not a lot of isolation, not real low noise, plenty good enough for 1 to 2x10^-11 at one second. A few alternatives are also pretty easy. Use a single logic to sine amp per output and drop the power splitter. Run video amp chips and forget about the logic conversion. For better performance, run discrete 2N3904(6) based amps for each channel. A lot depends on what you already have lying around. If it's not the garden variety stuff, then indeed you likely will need something a bit more complex. I'd still consider a simple system to drive the easy stuff and only go fancy for the one or two things that really need something that's low noise / high isolation / what ever. If you also are trying to do RF work (like HF radio) consider the spray from what ever you do. I have seen 10 MHz standard setups that put out massive signals at 30 or 50 MHz. A bit of thought, a solid ground sheet, and some cheap coils / caps can go a long way. Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Pete Lancashire Sent: Wednesday, February 23, 2011 11:18 AM To: Discussion of precise time and frequency measurement Subject: [time-nuts] was there ever a conclusion on distribution amps ? I will soon have my 11 th piece of equipment that I want to feed 10 MHz (and some oldies 5 and 1). What is the current though on making one's own distribution box ? -pete ___ 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 instructions there. ___ 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 instructions there. ___ 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 instructions there. ___ time-nuts mailing list --
Re: [time-nuts] GPS Antenna splitters
You could also look at http://g4hup.com/DA/DA.htm - specifically the G version, which is intended for just this application, feeding up to 4 receivers. I use one myself for a Z3801A, two thunderbolts and a Jupiter based G3RUH type GPDSO. Output level is individually settable if required, and so long as your terminate any unused outputs in 50R you can use it with any number of Rx's 73, Dave, G4HUP From: Dave M dgmin...@mediacombb.net To: TimeNuts time-nuts@febo.com Sent: Saturday, 5 February, 2011 1:16:08 Subject: [time-nuts] GPS Antenna splitters Has anyone measured the gain (or loss) of the Minicircuits ZAPD-3DB-1575-3 GPS antenna splitter? I've seen a number on the auction site, and am wondering if they have any gain. I see the 3DB in the model number, but don't know if it's gain or loss. I have a TBolt and an HP Z3801A. I can use the antenna with only one receiver at a time, but would like to run them concurrently.Since I'm using a 25db gain bullet antenna, I certainly don't want to lose any signal. If the ZAPD-3DB-1575-3 splitter doesn't provide any gain internally, which model splitter(s) can you recommend? David dgminala at mediacombb dot net ___ 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 instructions there. ___ 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 instructions there.
Re: [time-nuts] 10MHz to 80MHz frequency multiplier suggestions
Have you seen http://www.timeok.it/files/10_to_100_mhz_multiplier.pdf ? You should probably both take a look at this solution as a start - maybe not the 'best' but a good, cheap attempt, with a very clean output. Driven into an ACT gate running off a 3v3 supply it will give you the output you need for your ADC. Although the design is for 100MHz, changing the band pass filters to 80MHz will give you that as your output, so it will potentially meet both needs. My two penn'orth is build this for your $10 (ish) solution, and check it - if its not good enough (and I suspect it will be) then go for the $100 Personally, for this application I would first try it without the output stage, and replacing the A06 (MAR6) and A03 (MAR3) with a single Siemens BGA616 - there may be enough gain there to drive a gate with an input bias on it. The MAR's are not spectacular in their noise figures, but a second stage with low gain may be needed, just as a buffer out of the filter. Surely worth a try! 73, Dave G4HUP http://g4hup.com From: Chris Albertson albertson.ch...@gmail.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Monday, 31 January, 2011 18:27:06 Subject: Re: [time-nuts] 10MHz to 80MHz frequency multiplier suggestions I'd like to hear from one of the experts about which method has the least noise a PLL or a multiplier. The PLL could have a very good VCO, it could be a crystal oscillator that is steered by the phase detector. The The multiplier could introduce noise in the mixers or other active parts. I think the way to answer is to look at the budget. At the $10 price point which is best? at $100 and at $1000? I've seen it happen many times that the winning method changes with budget mainly because of the characteristics of real world components. I thought at first the 80Mhz might clock a sussession approximation A/D while it sampled a value from a sample and hold. But if 80Mhz sets the sample rate for an SDR then it is worth much more effect (and cost) to get right. I have an interest in this too as I'd like to drive a DDS chip with a 10Mhz GPSDXO and the DDS chips needs 100MHz clock and of course the question is what is the best design at various price points On Mon, Jan 31, 2011 at 9:48 AM, Elio Corbolante elio...@gmail.com wrote: Chris Albertson wrote: Does a A/D converter really need a GPS controlled clock? In this case where exact precision is not required you could use a 4046 phase lock loop chip. You set the VCO for 80Mhz then divide that by 8 and feed it back to the chip.[...] If you go this route, I think the 80 Mhz signal will be good enough to clock an A/D but maybe not for use as an 80Mhz precision frequency reference I'd prefer to multiply the clock because I'd like to have also a very low phase noise: the A/D is the one in the Perseus receiver (Direct sampling SDR receiver) http://www.microtelecom.it/perseus/ and for measurement purposes I'd like to have it spot on frequency. As you can imagine, being for a receiver, the low phase noise is a requirement. _Elio. ___ 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 instructions there. -- = Chris Albertson Redondo Beach, California ___ 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 instructions there. ___ 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 instructions there.
Re: [time-nuts] 10MHz to 80MHz frequency multiplier suggestions
Hi Chris, Yes, of course the multiplication plan is a little different, but in the circuit I linked the basic multiplier is a doubler from 10 to 20MHz, that produces a comb of 2f products. The design as presented has BPF's to select the 5th harmonic, and I was simply suggesting that by replacing these with 80MHz BPF's the same simple circuit would also be useful for the other respondent who wanted that frequency rather than 100MHz. As Rick has subsequently suggested, 3 cascaded doublers would achieve the 80MHz requirement very well, but of course they will not solve the 100MHz problem. For 100MHz you can easily do it in two diode multipliers - one to 50MHz (x5) and a doubler to 100MHz. But that's now two diffferent circuits, and I was looking at the $10 option.. I'm well aware that time nuts is probably the very worst reflector on which to post a 'simple' solution! However, it was, as I thought I had made abundantly clear, my thoughts for the $10 solution - I fully accept Bruces' comments about the ACMOS jitter issues, and as always it is up to the user to do his own homework as to suitability. I'm also aware that it is very easy to become 'over-focussed' on specs, and forget what the original job was to do! Since neither respondent was specific about what they are trying to measure or receive with their SDR's, or the ADC to be used, no-one can give meaningful guidance, but there are many who can tell you the best way to do it! I'm coming from the position that Robert Watson-Watt, of UK radar development fame, held - of course everyone wants the best, but that will take forever/be expensive. They would be very happy, and probably not tell the difference from that if given the second-best solution - so he aimed to deliver the third-best solution as a starter, and work towards second-best, on the basis that this would have 'something operational' in the shortest time. 73, Dave From: Chris Albertson albertson.ch...@gmail.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Monday, 31 January, 2011 20:35:57 Subject: Re: [time-nuts] 10MHz to 80MHz frequency multiplier suggestions On Mon, Jan 31, 2011 at 11:06 AM, dave powis g4...@btinternet.com wrote: Have you seen http://www.timeok.it/files/10_to_100_mhz_multiplier.pdf ? ... Although the design is for 100MHz, changing the band pass filters to 80MHz will give you that as your output, 80Mhz sounds close to 100Mhz. But look at the prime factors 80 = 2*2*2 while 100=2*5. With a 10X multiplier you are forced to do 2*5 but in an 8X multiplier you can double three times (2*2*2). -- = Chris Albertson Redondo Beach, California ___ 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 instructions there. ___ 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 instructions there.
Re: [time-nuts] Distribution Amp suggestions
Hi Murray, I have one you may also like to look at as part of your considerations - http://g4hup.com/DA/DA.htm Regards, Dave From: Murray Greenman murray.green...@rakon.com To: time-nuts@febo.com Sent: Tuesday, 26 October, 2010 2:01:32 Subject: [time-nuts] Distribution Amp suggestions Hi, We have more expensive distribution amps around the production facility here at RAKON than I'd care to count, and always seem to need more. I am looking for additional units as the requirements expand, something like the Symmetricom 4036B which we already use. Our need is for 10MHz distribution. Since we need to purchase several of these, can anyone suggest a unit with similar performance and quality that would be lower cost than the Symmetricom 4036B? Regards, Murray Greenman RAKON Ltd ___ 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 instructions there. ___ 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 instructions there.
Re: [time-nuts] GPS antenna splitters
Hi Ashley - look at http://g4hup.com/DA/DA.htm and follow the links for the 'G' version. Regards, Dave, G4HUP From: ashle...@aol.com ashle...@aol.com To: time-nuts@febo.com Cc: hy5...@citlink.net Sent: Friday, 26 March, 2010 19:47:05 Subject: [time-nuts] GPS antenna splitters Hi Everyone After a lot of learning, sweating (yes, girls do sweat), hand wringing, and a LOT of emails and great help , we have two of Mr Miller (G3RUH) GPSDO units up and working fine. Disciplined 10mhz all over the place. Now what we need is a GPS antenna splitter. S, we're looking for links, do-it-yourself articles, hints from you guys who have built them.. Ebay is really barren for these things, only one or two listed, but I thought we would try Time Nuts first and see ... Thank you everyone for all of your help with this GPSDO project !! Ashley Thank You Kiss-Electronics Ms Ashley Hall 183 N 5th Avenue Cornelius, Oregon 97113 W7DUZ www.kiss-electronics.com ___ 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 instructions there. ___ 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 instructions there.
Re: [time-nuts] Multiplying 10 MHz to 100 MHz
Hi Bruce, The filter you are referring to is the Neosid 120MHz filter - it is available from Eisch Electronik, http://www.eisch-electronic.com/ part no 511836. It is specified as 120 to 160MHz, so not sure it will go down to 100MHz. If you wish make an enquiry with Eisch, the proprietor, Uli, does speak English. Hope this helps, 73 Dave, G4HUP http://g4hup.com From: brucekar...@aol.com brucekar...@aol.com To: time-nuts@febo.com Sent: Friday, 8 January, 2010 20:18:32 Subject: [time-nuts] Multiplying 10 MHz to 100 MHz In an earlier post I mentioned that I had been searching on-line for ideas to multiply a 10 MHz signal to 100 MHz. I would like to multiply the 10 MHz outputs of an LPRO and a Thunderbolt GPS to feed to 10 GHz phase-locked microwave sources so their outputs can be fed to a mixer for enhanced frequency comparison. F4GBC kindly provided the following link for an article in French. HI all, have a lok to : http://pagesperso-orange.fr/f5cau/ol_shf/OL9HX.pdf very interesting for those who read french. Alain F4GBC After looking at the article I searched on-line for the part number of the specified 100 MHz filter and found a link to an English language version of the article _http://g4hup.com/DFS/F9HX%20synthe%20english.pdf_ (http://g4hup.com/DFS/F9HX%20synthe%20english.pdf) , should anyone be interested. Bruce Hunter, KG6OJI ___ 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 instructions there. ___ 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 instructions there.
[time-nuts] Help!! Utility for Z3801A control
Happy New Year to all Following a PC crash on the shack PC, I have lost my archive of prgrams, as well as the operational ones - included in them was the HP utility I used to connect to the Z3801A - I think it was called HP Satconn or something like that? Can anyone in the groups help by either forwarding me a copy, or pointing me to somewhere I can download it? So far I haven't been able to identify a source using the usual search engines. Thanks in advance 73, Dave http://g4hup.com ___ 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 instructions there.
Re: [time-nuts] Distribution Amp project
Old network cards are an excellent source of isolating transformers, filters and small DC-DC converters. If you need to distribute sinewave 10MHz signals (some items accept or even need a square wave) then the filters that can be recovered from the cards are very useful - they include isolation transformers. There's an article about it in the Distribution Amp section of my webpages - go to http://g4hup.com/DA/DA.htm and follow the 'filters, transformers and DC converters' link. The article was originally published in Scatterpoint, the monthly publication of the UK Microwave Group. Best 73, Dave, G4HUP http://g4hup.com From: Dave Baxter d...@uk-ar.co.uk To: time-nuts@febo.com Sent: Thursday, 30 July, 2009 1:54:19 PM Subject: Re: [time-nuts] Distribution Amp project Old scrap PC network cards? The DC-DC isolated converters are useful to pull too. Dave Baxter. --- Original Message --- Message: 6 Date: Thu, 30 Jul 2009 00:16:12 -0400 From: Dave M masond...@comcast.net . . Trimmed ! . Also, looking for a source of low cost 1:1 and 2:1 Ethernet transformers. I've tried the local computer shops, but they don't seem to be interested in helping. Dave M ___ 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 instructions there. ___ 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 instructions there.
Re: [time-nuts] Where does 28V come from?
Phone companies work off a standard 48v (often referred to as 50v) for exchanges and 'in building' installations. This includes mobile phone operators. But a significant amount of equipment in the mobile network is not in the exchange sites - it is in the BTS (Base Transmitter System) cabinets, where 28v is used. Henace a lot of ex-mobile phone co equipment, such the HP/Symmetricom Z380xx, Lucent RFTG's that were around, and power amplifiers used on 23 and 13cm amateur bands, is normally capable of being powered from either 28V or 48V supplies, since it could be deployed in either situation. 73, Dave, G4HUP From: Roy Phillips phill...@btinternet.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Tuesday, 21 July, 2009 4:42:01 PM Subject: Re: [time-nuts] Where does 28V come from? abcde - Original Message - From: Roy Phillips phill...@btinternet.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Tuesday, July 21, 2009 12:04 PM Subject: Re: [time-nuts] Where does 28V come from? Hal I think you will find that 28 volts DC is standard in many aviation and military mobile equipment power requirements. It is the nominal battery voltage that comes from two 12 volt cells in series that are fully charged. The voltage to run such equipment is not critical (can be less than 28 volts), as you normally charge two series 12 volt cells at 27.6 volts - this is indicative of the nominal voltage of such supplies. Trust that this is the information you are looking for ? Roy Phillips. - Original Message - From: Hal Murray hmur...@megapathdsl.net To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Tuesday, July 21, 2009 7:59 AM Subject: [time-nuts] Where does 28V come from? That said, the modules also appear to be powered by 28VDC, add some regulation, you could use the chassis to power the Thunderbolt, and mount it in one of the blank panels. Lead acid batteries are close to 2V per cell. For cars/trucks, they come conviently packaged in 6V and 12V units. The phone company works off 48V. But where does 28V come from? The Isotemp OSCO 127-10 data sheet says 27 V, but that's +3, -6 or 21-30V which straddles both 24V and 28V. -- These are my opinions, not necessarily my employer's. I hate spam. ___ 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 instructions there. ___ 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 instructions there. ___ 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 instructions there. ___ 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 instructions there.
Re: [time-nuts] (no subject)
Hi David, I don't know the Chinese ones, but I was lucky enough to get one of the TAPR offer TBolts - and it really was PP - yes, I attached a PC and used the TBolt monitoring utility to confirm it was all working OK, but that was all. It now sits in my shack outputing 10MHz very nicely. 73, Dave From: David Hilton-Jones david.hilton-jo...@clneuro.ox.ac.uk To: time-nuts@febo.com Sent: Tuesday, 30 June, 2009 1:28:07 PM Subject: [time-nuts] (no subject) I am not very much interested in how it is achieved, but wonder if a 10MHz oscillator locked to GPS is now available as plugplay rather than needing a lot of time/effort/building. I note the Thunderbolt units available from the Far East on ebay for~£80gbp. Are these really PP - that is, just connect PSU and aerial and out comes 10MHz locked to GPS? Is it necessary to connect to a computer via the RS232 link, or is that just there if you want to fiddle and be clever? If so, then this may be preferrable to running my rubidium source continuously. What I am interested in is stability, not ultiamte accuracy. As always, sorry for the naivety of the question. Thanks David, G4YTL ___ 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 instructions there. ___ 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 instructions there.
Re: [time-nuts] GPSDO project - 66.667MHz from 10MHz
You can also use a DFS (Direct Frequency Synthesiser) to produce 66.667MHz in two ways - either 50 + 16.667MHz, or 70 - 3.33MHz. Information on the 50+16.667 is on my web site (http://g4hup.com), and has been implemented as a reference source for an SDR-IQ receiver. Another customer of mine has also implemented the 70-3.33MHz version for the same application - I don't have the filter component values or detail design posted, but could provide them on request.. My personal preference is for the slightly more complex 50+16.667Mhz option, since the filtering is a little easier at VHF - but both solutions work, and give a good clean, stable low-noise output (depending on the quality of your 10MHz reference input, of course!) Kits are available. Hope this helps 73, Dave, G4HUP From: Bruce Griffiths bruce.griffi...@xtra.co.nz To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sunday, 28 June, 2009 11:04:49 PM Subject: Re: [time-nuts] GPSDO project Hal Murray wrote: You want 66. MHz from 10 MHz. I can think of several approaches. 1) Patch the radio stuff to work with 10 MHz. Since 10 MHz is common from things like GPSDOs or Telco surplus rubidium clocks, somebody may have done that already. 2) Build a PLL. The first step is probably to find a 66.666 MHz oscillator that has an external fine tuning pin. Then it's divide by 20 and 3, compare, filter... 3) Get to 66.666 MHz by dividing by 3 then multiplying by 2 and 5. I don't know much about this area, but there was a lot of discussion here a few months ago. Check the archives. Actually need to multiply 3.333.. MHz by 20 (5 x 2 x 2) No need to multiply by 2 or 4, if the output of the divide by 3 is a 1/3 duty cycle square wave, one can extract the 2nd (or 4th) harmonic of the square wave repetition rate with a filter. Amplify and multiply by 5 (can use the same approach as used in the 5370A/B frequency multiplier chain (1 transistor per multiplier) and filter. A high level injection locked divider can have lower close in phase noise than a digital one. 4) Use a DDS chip to synthesize 66.666 MHz. Analog Devices makes lots of nice ones. One problem with DDSes is that they normally make spurs. But they aren't a problem if the target frequency is a clean multiple of the source frequency. 20/3 doesn't sound clean, but I'd have to do a lot of work to check the details. There may be a clean frequency that is close enough to 66.666 MHz and/or one that has spurs that are far enough out so you can filter them. 5) Use a low cost 66.666 MHz oscillator and live with the error. You may be able to correct any errors. The key step would be to feed the 66.666 MHz to a counter running off the T-Bolt clock so you know the real frequency of your 66.666 MHz osc. Suppose your 66.666 MHz is 73 ppm fast and you want to listen to 12.123 MHz. You would set the radio to listen to 73 PPM below 12.123 MHz. Bruce ___ 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 instructions there. ___ 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 instructions there.
Re: [time-nuts] GPSDO project - connecting external 66.667MHz into the SDR-IQ
See the pages on my web-site (http://g4hup.com) - instructions for connecting external LO signal to SDR-IQ are given there - these came from RFSpace. WW2R has implemented this with a small switch on the back panel of the SDR so he can use internal or external LO when available. Would be very interested to hear whether these same instructions apply to an SDR-14 - anyone prepared to open theirs up and have a look? 73, Dave, G4HUP From: WB6BNQ wb6...@cox.net To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sunday, 28 June, 2009 11:55:46 PM Subject: Re: [time-nuts] GPSDO project Hi Brad, I am a little confused about your intentions. There is no mention on the RFspace web site about a provision of being able to feed in an external reference signal to the SDR-IQ or the SDR-14 for that matter. If you study the Analog devices AD6620 component, you will see that it is a 3.3 volt * * * ONLY * * * process, which only adds to the problem. Additionally there are constraints on the rise and fall times of the timing signal. This is a horrifically complex component with intricate dependencies tied to the specific A/D used. This is not your daddy's VFO from yester-year. The fact that the internal DDS is a digital function means you will never, ever, get to a perfect cardinal point, except under very special conditions. In this case it will have an offset of 16 pico-seconds because that is the smallest resolution the DDS can do. While small it would require very special hardware for you to keep it locked to the GPS. As the internal clocking system runs more then just the DDS, other considerations come into play. The clocks built to run these chips are not designed for external control and studying the physical layout of the SDR-IQ, it does not appear that they provided any means to have external clocking ability. Besides the computer's sound card DSP is heavily involved with regards to the frequency calibration. So there are two independent clocks to keep synchronized that are not related to the listening time, particularly if you record the digital bits for later listening or analysis. Fortunately, the software will allow for you to calibrate, to some degree, but it is not and you will not be able to approach what you expect to do with the Thunderbolt. Keep in mind that the best you could do with a Thunderbolt on a 1 second per second comparison basis is only 1 part in 10 to the minus ninth (1x10^-9). It gets worse if you consider shorter times like a continuous analog aspect that you would have for active listening. The noise of the GPS system would mask the 16 pico-second resolution of the SDR-IQ DDS. The real problem is temperature. You could improve that by providing a chamber for the SDR-IQ and raising, carefully, the temperature to just above your highest ambient level. After all that, I am not saying you couldn't/wouldn't/shouldn't consider it. Keep in mind that the SDR-IQ, or for that matter, the SDR-14 DDS only sets the center of the 190 KHz bandwidth swath that you are viewing at any one time. The real fine aspect is done in the computer and the clocks in those are all over the map, so to speak. In order to have a really tight calibration, with Timenuts quality, would involve some serious effort to build a clocking system for both the SDR-IQ and the computer. The final result is you would still be offset due to the digital processes in both the SDR-IQ and the computer, plus, perhaps, some latency in the software. As I get to the point of sending this email I see that Dave Powis, G4HUP, has gone to the trouble to lock the SDR-IQ internal oscillator to an external 10 MHz. If you look at all the information on his web site, you will see that it is not a trivial project. As I pointed out, this only stabilizes the window of the SDR-IQ still leaving the computer to tend with. My experience with the Thunderbolt shows that it has some temperature dependencies and the expected nominal noise of the GPS system in the short term regard. What most people do is have a high quality house standard and do long term comparisons to the GPS. A high quality house standard would, in effect, filter the short term noise of the GPS system. At any rate, this is my fantasy and I am sticking to it ! BillWB6BNQ Brad Dye wrote: I have just purchased a Thunderbolt GPS receiver. I hope to use this to discipline an oscillator on 66.6 MHz so I can use it as a LO on my Software Defined Receiver (SDR-IQ). Building such an oscillator is a little over my head so I thought I would ask the group if anyone knows where I could buy the missing link of this project. I have put a drawing of my project on the web showing the specs of what I need. The oscillator is shown in the blue box. Any help or suggestions would be greatly appreciated. http://www.braddye.com/gps_do.html 73s Brad Dye K9IQY ex KN9IQY, KN4BK, KM5NK
Re: [time-nuts] GPSDO 10 MHz Distribution Amp
Hi Paul, Sounds a reasonable approach to me where an equal 2 way split is needed, and you already have adequate signal level available. May not be up to 'time-nuts' precision etc, but it is a practical method that will give what you need. If you ever need to remove one Rig, just remember to terminate the unused split output in 50R! However, when you get yourself an analyser, sig gen or counter that takes the 10MHz reference, then you will need a DA! Comeback to me (http://g4hup.com) or TAPR then! 73, Dave http://g4hup.com From: Paul Christensen w...@arrl.net To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sunday, 21 June, 2009 5:18:51 PM Subject: [time-nuts] GPSDO 10 MHz Distribution Amp In the next couple weeks, I plan on distributing the output of my GPSDO to a pair of Icom transceivers. I've thought about using a DA like the TAPR TADD-1, but it seems that I can simply split the output of the +13 dBm GPSDO with a Z=50, 3dB equal power divider, that will yield an output of ~ +9.5 dBm to each transceiver. I can't foresee any port isolation issues that would make necessitate the use of the DA for this application and the 3 dB hit in level to each transceiver still seems reasonable for proper transceiver operation. Am I not considering something important? Also, I do not want to add any noise with such a distribution that would in any way destroy the excellent phase noise characteristics of my GPSDO. Thoughts? Paul, W9AC ___ 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 instructions there. ___ 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 instructions there.
Re: [time-nuts] GPSDO 10 MHz Distribution Amp
Hi Jim, Thanks for the enquiry. I do prefer to supply kits, as I am not a full time business, and need to work for a living! However, on request I do build units, so if that is what you want, I can quote for that. Cost for the DA1-4L assembled will depend on the connectors you want fitted - if you note from the page, I don't supply connectors with the kit, since some folks want BNC's to fit in their systems, while others want SMA's. Let me know what connector you are interested in, and where the finished unit is to be shipped to, and I'll put a quote together. Best 73, Dave, G4HUP From: Don Key don@ntlworld.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Monday, 22 June, 2009 12:14:23 AM Subject: Re: [time-nuts] GPSDO 10 MHz Distribution Amp Hi Dave Do you supply your DA1-4L distribution amp as a ready-built unit? Your PDF Technical manual says you do, but there are only prices for the kits on your ordering page. Cheers. Jim. - Original Message - From: dave powis g4...@btinternet.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sunday, June 21, 2009 5:34 PM Subject: Re: [time-nuts] GPSDO 10 MHz Distribution Amp Hi Paul, Sounds a reasonable approach to me where an equal 2 way split is needed, and you already have adequate signal level available. May not be up to 'time-nuts' precision etc, but it is a practical method that will give what you need. If you ever need to remove one Rig, just remember to terminate the unused split output in 50R! However, when you get yourself an analyser, sig gen or counter that takes the 10MHz reference, then you will need a DA! Comeback to me (http://g4hup.com) or TAPR then! 73, Dave http://g4hup.com From: Paul Christensen w...@arrl.net To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sunday, 21 June, 2009 5:18:51 PM Subject: [time-nuts] GPSDO 10 MHz Distribution Amp In the next couple weeks, I plan on distributing the output of my GPSDO to a pair of Icom transceivers. I've thought about using a DA like the TAPR TADD-1, but it seems that I can simply split the output of the +13 dBm GPSDO with a Z=50, 3dB equal power divider, that will yield an output of ~ +9.5 dBm to each transceiver. I can't foresee any port isolation issues that would make necessitate the use of the DA for this application and the 3 dB hit in level to each transceiver still seems reasonable for proper transceiver operation. Am I not considering something important? Also, I do not want to add any noise with such a distribution that would in any way destroy the excellent phase noise characteristics of my GPSDO. Thoughts? Paul, W9AC ___ 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 instructions there. ___ 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 instructions there. ___ 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 instructions there.
[time-nuts] NIB NI ISA GPIB Card - was - Re: HP82335 HPIB Card
If anyone wants to make me an offer, I do have a genuine NI ISA GPIB card sitting in its box with the original documentation and driver disk (not very useful now unless you're running Win 98 or earlier I guess). But from the thread, it would seem that there are WinXP drivers available for this card so it might be useful to someone who's running a machine with ISA slots. I now have a PCI GPIB card (Measurement Computing) which works fine with John's excellent software, so won't be needing this one. Please reply off list - g4...@btinternet.com Dave, G4HUP http://g4hup.com From: J. Forster j...@quik.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Thursday, 28 May, 2009 7:13:44 PM Subject: Re: [time-nuts] HP82335 HPIB Card Not so. I just went through this. Even the older ISA NI GPIB cards will work on XP with the right drivers. It may take some looking on the NI site to find the drivers. I took the easy way out and just called NI. They were very helpful. -John === Many of those older ISA GPIB cards never had Windows NT drivers written for them, much less 2K/XP. That's true of National Instruments, and wouldn't surprise me if it's true of HP as well. I'm guessing you'll need to stick with Win9x if you need to use that card. (You don't have to go all the way back to Win95, as Win98SE will use the same drivers.) -- john, KE5FX -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]on Behalf Of Martyn Smith Sent: Thursday, May 28, 2009 10:43 AM To: time-nuts@febo.com Subject: [time-nuts] HP82335 HPIB Card Hello, I'm trying to get a 82335 HPIB card to run on my computer. The card works in an old computer running windows 95, so I know the card is ok. I have a Pentium 3 running windows XP home edition. This computer has an ISA connector, so the HPIB fits ok. But the computer just doesn't recognize my HPIB card. Can anyone help. It may be that windows XP is too new to run on this computer. The ISA connector is actually on a cage that plugs into a PCI base, so I'm wondering if that's a problem as well. Any advice will be much appreciated. I have just bought win95 on eBay, and I'm going to try that when it arrives. Best Regards Martyn ___ 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 instructions there. ___ 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 instructions there. ___ 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 instructions there.
Re: [time-nuts] looking at creative ways to route GPS signals through a home to a Thunderbolt
Hi Scott, Looking at your proposed implementation below, you may like to look at one of my kit products - a distribution amplifier which will split a GPS antenna signal up to 4 ways, and will act as the power source for the antenna. There is no need to disable the 5v feeds in the receivers, since there are blocking caps in the DA, although if you do have the software control of them, it would be better to disable! Have a look at http://g4hup.com/DA/DA1_4.htm and look for the details of the G version. Hope this may be useful to you. Regards, Dave, G4HUP http://g4hup.com From: Scott Burris slbur...@gmail.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Wednesday, 8 April, 2009 6:21:11 PM Subject: Re: [time-nuts] looking at creative ways to route GPS signals through a home to a Thunderbolt This is an unused coax run, so there's no AC or DC on this line to be a problem. I do carry feeds from 4 security cameras via a 4 channel modulator on other coax runs to elsewhere in the house, but I can't see trying to mix this application with GPS to this room -- I should really just digitize the security cameras and put it on the IP network, a problem for another day. I've got some vague thoughts about splitting the received signal in this room to go to the Thunderbolt, an NTP server, and one of my homebrew GPS clocks (answering phk's question about just pushing the T-bolt output through the coax from the garage). My priority though is to get my T-bolt permanently installed and running 24/7 so it can be my house frequency standard. All the other uses are secondary to this. In any case, it sounds like it's a worthwhile experiment. I'll have to go through my antenna collection and see what works best. Scott bro...@pacific.net wrote: Hi Scott Most GPS antennas have some amount of gain and that varies from none to over 50 dB, with about 20 to 30 dB the most common. The idea is for the system noise figure to be established by the antenna and not the coax loss getting to the receiver. To have gain requires DC power to the antenna. It turns out that most GPS antennas run fine on 3 to 5 Volts. For example the Motorola Timing antenna (white inverted ice cream cone)is specified to run over that voltage range. So you're option C can work if you properly manage the RF and DC aspects. If the DC aspects are not handled properly you risk smoking the antenna. One of the potential problems is there may already be DC or AC on the CATV coax that's not compatible with the GPS antenna DC requirements. Do you have a diagram of the CATV system? Have Fun, Brooke Clarke I have a Thunderbolt (thanks TAPR!) located in a second floor room of my house which has only an obstructed view of the sky. There's no easy way to get to that room, short of putting an antenna on the roof and punching a hole in the wall to get inside. For some reason, my wife takes a dim view of that plan. Plan B would be to mount the antenna near an attic vent, run the cabling inside, go through the attic and drill down into one of the inner walls to terminate in an outlet box of some sort. So the dedicated time-nuts may laugh at plan C. This is to mount an antenna on roof near the garage and connect to the RG6 CATV run from the garage to this room. I'd guess it's about 60-70ft of RG6. Can RG6 pass the 1.5Ghz signal successfully? Is the Thunderbolt sensitive enough to be used this way? Has anyone tried this? Scott ___ 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 instructions there. ___ 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 instructions there. ___ 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 instructions there. ___ 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 instructions there.
[time-nuts] New Distribution Amplifier Kit
Hello all, Just to let you know that I've added a 4 way distribution amplifier kit to my products at http://g4hup.com/DA/DA1_4.htm. I'll also openly tell you that is not intended as a high quality lab instrument, but is a simple general purpose tool intended for distribution of signals anywhere up to 1800MHz, where phase and output level accuracy variations are not very critical. There is (deliberately) no frequency tailoring or transformer isolation provided in the unit, but details of how to achieve this externally are given in the documentation for the unit. It is ideal for sending 10MHz to your test equipment stack for general purpose measurements, or for distributing an rf signal to a number of destinations, such as sharing an IF signal between conventional and SDR receivers. Having run it down in the last paragraph, when driven from a nominal +10dBm source the measured phase variation between the outputs at 10MHz is less than 3 degrees, and it provides 4 +10dBm outputs within +/- 0.25dB. There is also a variant that will provide distribution of GPS antenna signals, including providing power feed for the active GPS antenna itself. For those who may not want to know about this, my apologies for the bandwidth! regards, Dave, G4HUP http://g4hup.com ___ 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 instructions there.
Re: [time-nuts] A Short but sweet Reply
Hi Clint, Quite an impressive list of sources you've put together from the assembled replies! Also I found your pages interesting in regard to the progress with deep space reception. You may also like to look at my web information on Direct Frequency Synthesisers for providing low phase noise drive solutions for microwave oscillators strips, locked to a reference source - eg a GPSDO. url is http://g4hup.com Best 73, Dave, G4HUP - Original Message From: Clint Jeffrey - VK3CSJ [EMAIL PROTECTED] To: time-nuts@febo.com Sent: Tuesday, 2 September, 2008 4:35:01 PM Subject: [time-nuts] A Short but sweet Reply I was falling asleep at the Keyboard an accidently sent my post to soon...aha it happens when you get old! Hi folks, I have had a number of replies to my first post, thanks guys, let me see how can I reply... Gerald...g'day, I see you're a stones through away, just checking out your QRZ.COM entry, you are definitely a well travelled fellow, I've been in Electronics Manufacturing for 30 years myself but only once got a chance to trip overseas, 10 days in China at Tianjin Beijing it was a great experience. Nice to be here too. Thomas...thanks for your kind note, Amateur Radio is definitely a great medium it is truly amazing that the amateur service world wide have so many Radio Bands allotted to us for our use from Long Wave to Microwave and with the Solar Maximum coming up in a few years time its good to have a operational HF Station one can make some great contacts, all I can say is go for it! Stan...Hi, thanks for the info on Down East Microwave, it's been a couple of years since I last visited the web site, I have purchased a few items from them in the past they definitely make some nice toys...I'll keep them in mind. As for Stephen N5AC web site, very interesting indeed I've already let a couple of friends of mine know about this one...thanks again. Bill...Thanks for pointing out the A32 Synthesizer, this is quite interesting and requires some further looking into, I'm slowing building up my 10GHz station starting with kits supplied by Mark VK5EME at Minikits and with a 20 Watt TWT I got from DEM I hope to do some interesting things! David...Yes KUHNE Electronics make some very very fine equipment, a little expensive, but the quality is through and through, I purchased a 8.4GHz Pre-Amp from them for the 8.4GHz receiver, it's the key part of this project and the most expensive part, so I'm really looking after this device. If I had the money I'd be interested in a few more items!! Jim L...There is a handful of Amateurs that have quite successfully detected the Telemetry Signals from both NASA and ESA space probes currently roaming space, the idea is to simply detect these feebly weak signals, that's the aim, trying to copy telemetry and things like pictures is a long shot considering the digital nature of transmissions these days. If you visit this site, http://www.uhf-satcom.com/ or more directly this link, http://www.uhf-satcom.com/mro/ you will see what I attempting to do, there is a Block Diagram showing the basic system setup required, I have pretty much everything I need I've just got to put it together. Joseph Ruggieri often has microwave items for sale on eBay that's where I got my Brick from, Joe currently has some items on eBay but I don't think he has any of the PLO devices left, one can always ask. Okay...I think that's it for the time being...its just gone 1:30am...must go to bed. Cheers all... Clint - VK3CSJ Melbourne ___ 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 instructions there. ___ 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 instructions there.
Re: [time-nuts] PCB for frequency dividers
David, Have you had a look at http://www.top-tec-pcb.com/eng/index_.html? I use them for my boards, and running a quick estimate using the details you've published. They aren't quite at the price you've indicated, but for a slightly higher number they do get significantly cheaper. There are some items which could affect the price that you haven't quoted, such the number of buried vias, but you can input all that in their on-line calculator - use the Power-Pool quote system, not the prototype quote link. Regards, Dave, G4HUP http://g4hup.com - Original Message From: David C. Partridge [EMAIL PROTECTED] To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Thursday, 24 July, 2008 7:43:23 PM Subject: [time-nuts] PCB for frequency dividers I'm going to place an order for the PCB for my frequency divider in the next few days. If I can get a batch of ten ordered the cost will be about USD60 each plus postage to wherever you are. PCB is four layer, 5 by 3.5, pads will be electrolytic Ni/Au (this house doesn't charge extra for that). The price goes down as the numbers go up of course. If anyone thinks they can better this price, I'm happy to ship the gerbers and NC drill files. I never did hear back from Magnus about the circuit driving the selectors on the '4051, so that stays as it is. I have one firm request from Norman J McSweyn. If anyone else would like to order a PCB please could you email me directly (rather than on list) at david dot partridge at dsl dot pipex dot com I also have a few spare of the '4017 dividers and lots of BAV99 which I'm happy to pass on at cost to me. Cheers Dave ___ 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 instructions there. ___ 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 instructions there.
Re: [time-nuts] Ovenaire OCXO pinout needed
OK John - yes that does sound different, and the clues look quite strong! I offered the info on the basis that many manufacturers tend to use a fairly standard pin-out - but maybe not this time! 73, Dave - Original Message From: John Miles [EMAIL PROTECTED] To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sunday, 7 October, 2007 12:27:00 AM Subject: Re: [time-nuts] Ovenaire OCXO pinout needed Hi, Dave -- That doesn't sound entirely comparable to this one, unfortunately. I do have a partial clue: the seller left about a centimeter of wire on each of the 6 terminals. They are: 1 Gray 2 Pink/black 3 Bright red 4 Clear (RG174 center conductor; likely the output) 5 Ground (bonded directly to metal can) 6 Either an EFC reference or oven ground (insulated but jumpered to pin 5) The OCXO from the Tek analyzers uses several different supply voltages (+17, +15, and +5). I'd guess this one wants to see similar voltages, but I'd rather not put +17 and +15 volts on randomly-chosen pins and optimize for minimum smoke. I could always compare impedance/resistance readings with the one in my Tek SA, but that wouldn't tell me anything about the required supply voltages even if it did help determine the pinout. -- john, KE5FX -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of dave powis Sent: Saturday, October 06, 2007 3:56 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Ovenaire OCXO pinout needed ); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Hi John, I don't have this particular OAM Unit - I have a model 42-23 - but I do have the pin-out for it, and it sounds very similar to what you describe, so maybe this will be helpful. Viewed from above - ie as you would look down on it when on a board, with the pins to the left of the unit, they read from top to bottom as: 1EFC IN - feedback from 10k trimpot for manual adjustment of Freq out 2EFC REF - source voltage for 10k pot, hot end - cold end left open. 3VCC +12v -heater supply? 4GND 5RF Out 6VCC +10v - Osc supply? I expect your unit uses the same arrangement, but at least this should give you something to experiment with. 73, Dave, G4HUP / ND8P ___ 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 instructions there. ___ 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 instructions there.
