Robert I think I am getting to the bottom of some of the questions - the Rx (internal) is the same as yours -the last digit is also hand written and is probably a 2 so we are talking the same animal. And you are almost certainly correct in that I did not detect the 10 MHz signal because the 'Scope was set to DC input, and I remember a very tiny signal showing through (you cant fool a Tek.a scope!). I have put the 325 to one side for the moment, and returned to the task which I had in hand prior to this acquisition. - restoring a EIP 575 Source Locking Microwave Counter. Do you know this item of equipment - it counts to 18 GHz, and despite its age (1983), its beautifully built, fairly easy to repair, and works very well. All I am doing is to return it to its original AC input wiring and front panel ON/OFF switch. This item I understand was part of the failed "airborne early warning system" that never was. The MoD had the conversion done I understand, in the UK-- the modification was to change the power transformer to a 400 Hz type (aircraft installation), the power switch was moved to the rear and military spec. power connectors were fitted. All I can say is it was an example of the worst kind of workmanship. As for the SMPS in the Wavtek 395 - this was made for Wavetek by a Taiwan specialist SMPS manufacturer. The UK Agents , or the US agents were never able to provide, - (special order for Wavetek) and to date I have not had the information I need from the factory in Taiwan. It looks like a PSU from the standard PC, but it has different outputs. As I told you, I connected the supplies from external sources - and presto it worked ! What are you struggling with ? or is it my luck to have all these items in need of repair or incomplete ? Finally, no the 325 was not from Longleat (I thought that was a place to see the animals?). I would assume that they were all part of a consignment from a MoD sale ? Will keep in touch re the 325 - thanks again.
Roy ---- Original Message ----- From: "Robert Atkinson" <[EMAIL PROTECTED]> To: "Discussion of precise time and frequency measurement" <[email protected]> Sent: Monday, February 11, 2008 9:48 AM Subject: Re: [time-nuts] Odetics 325 - 865 > Hi Roy, > The receiver you have is the one requiring a down converter antenna. You > should see a 10MHz signal on the antenna, but it's low level. Make sure > the 'scope is on AC coupling or the 12V DC supply will swamp the 10MHz. > The part numer on my receiver is 330-102. the 2 is hand written so could > be a build number. If you don't see the 10MHz signal it's possible that > someone has put another GPS RX in the box but I doubt it. The Odetics RX > is two boards and does not have any L-Band of UHF components at the input, > fairly obviously a down converter type. > These units had a range of oscillator options, one of mine has a > Rubidium, the other an OXCO with no obvious makers mark. > The lock-out is not something I've seen. The simplest solution is to > remove the back-up battery and leave the unit for a while for the CMOS > memory to clear. The only setting you might want to take note of is the > ADC value for the oscillator tuning. > You can use the unit to compare it's oscillator with an external 1PPS but > I don't think you can get it to discipline from the external signal. As > far as I recall the information about this aspect is unclear. Did you pick > the unit up at Longleat a few years ago? > Shame about the Wavetek unit. Sometimes the PSU's are standard types and > you can get an alternative from another manufacturer. > Regards, > Robert. > > > Robert > > Thank you for your information. First of all I am located in West Sussex - > not so far from you ! This is not a good location for Radio signals > generally. Back to the 325-865, I have checked the antenna socket and it > is > giving a 12 volt output - but my 'scope fails to see any sine wave output > !! > The actual label on the receiver states : ODETICS GPStar Receiver Model > 330-10Q Rev N/C, is this in keeping with your comments on the antenna > requirements ? It also has a Vectron Model 247-8566 Oscillator - - is this > the basic standard ? > Rob has kindly supplied me with a copy of the Model 425 which I understand > is very similar - despite wading through it I cannot find the way to clear > the *FRONT PANEL LOCKOUT* this occurs when I attempt to initiate "cold > start".Any ideas on this problem. > On the "Built in test" readout, all but the SnstOpr return a NRM > (?normal), > but SnstOpr is FLT -what is this about? > As for SMPS - what a curse these things can be - I found a Wavetek 395 > Function Generator (currently sells S/H for US $3500), which has a > failed(blown up) SMPS - and to date I have not been able to get info from > the Taiwan manufacturers (burnt out resistors, blown up power transistor). > I > have connected external power to it - and it works! - I am tempted to > build > a linear PSU if I cannot repair the SMPS.!! > Look forward to hearing more from you > Thanks and best wishes > > Roy > > ----- Original Message ----- > From: "Robert Atkinson" > To: "Discussion of precise time and frequency measurement" > > Sent: Sunday, February 10, 2008 6:04 PM > Subject: Re: [time-nuts] Odetics 325 - 865 > > >> Hi Roy, >> Welcome to the group. >> I've a couple of the sat-sync 325 receivers. Rob has covered the basics >> of the antenna question, the best way to determine if you need a down >> converter antenna is to put a 'scope on the antenna connector and see if >> there is a sine wave 10MHz signal as well as the 12VDC. An "R" suffix to >> the part number indicates a retrofitted L1 (standard 12V antenna) GPS RX. >> Some also have a label stating a 3rd party retrofit GPS has been fitted. >> The original downconverter GPS is a Magellen OEM in a big (about 8" >> square >> by 3" high) box in the bottom of the unit. >> At least you don't have the common problem with these units, a failed >> switch-mode power supply. >> Where in the UK are you located? I'm in Dorset on the south coast. >> >> Robert G8RPI. >> >> >> Roy Phillips > wrote: >> Gentlemen >> >> Pleased to join you - I major in "high-end" test equipment, and have >> recently added a couple of Watkins-Johnson Rx's -- Dual 8607 (20 - 2032 >> MHZ) ,and a WJ 8700 again dual LF/HF (to 32 MHZ). But I have now gathered >> a couple of items of "Time & Frequency" . The first one is a Radio Code >> Clock RCC 8000, this receives the 60 Khz Standard frequency transmissions >> from our UK transmitter. This is fine - works OK. Now I have a bigger >> challenge - I found a ODETICS Model 325-865 SatSync which has been >> gathering dust since 1998 (last date it was active). >> It was switched on (and no antenna was connected), I don't have one. It >> came to life and scrolling its menu it shows a date in 1998 and a set of >> co-ordinates which suggests it was probably a ship installation. I found >> my way to your site through searching for info on this item, and I gather >> that some of you have this item of equipment - can you help - I gather >> that it requires an active antenna - what can be found or built to meet >> this need? >> Also the system is "Locked" - what do I do to clear this problem ( the >> menu display suggests I refer to the manual !!) Is it possible to obtain >> a >> manual or copy of such. I must admit that it is a very well made item and >> must be worthwhile to re-establish. looking forward to any help you may >> offer. >> >> Roy >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> >> >> >> --------------------------------- >> Sent from Yahoo! - a smarter inbox. >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > > > --------------------------------- > Yahoo! Answers - Get better answers from someone who knows. Tryit now. > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
