Hi Bob - I have attached text and a photo for the Z3805. But - do you have a Z3801? It sounds like it.
John Allen K1AE -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Robert Benward Sent: Sunday, May 23, 2010 1:06 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject) John, Did any of the other LEDs come on? All I had was power for a few hours.....not to mention the lack of communications.... Bob ----- Original Message ----- From: "John Allen" <[email protected]> To: "'Discussion of precise time and frequency measurement'" <[email protected]> Sent: Sunday, May 23, 2010 12:36 AM Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject) > Bob - I have a Symmetricom/HP Z3805. When I first got it I powered it up in the > North end if my house, where car GPS's can't lock, left it on for a day or more, > and it locked. No computer involved. The antenna is a MA/COM mag mount from > 1997. > I bought the unit from fluke.l on ebay from China. > > John Allen K1AE > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On Behalf > Of Robert Benward > Sent: Saturday, May 22, 2010 11:31 PM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject) > > Thank you all for these inputs! > > Most importantly, the big question is: Regardless of RS-232 or 422, will the > unit do ANYTHING without communications? > Do I need a computer to get anything beyond the "power" led? > > I bought this at the Dayton convention ham flea market, and the guy told me it > was already modified for RS-232. The > board inside says RS-422 near the connector. Without the other LEDs blinking, > I'm worried I bought a dead unit. I had > a GPS antenna on it, but it never locked on. Do I need a computer to enable > this thing? > > Thanks, > Bob > > ----- Original Message ----- > From: "Bob Camp" <[email protected]> > To: "Discussion of precise time and frequency measurement" <[email protected]> > Sent: Saturday, May 22, 2010 10:54 PM > Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject) > > >> Hi >> >> In this case the RS relates to Radio Shack ...... >> >> Not a lot of standardization in the RS-232 world. Take a look at the slew rate > limiting requirements in the original >> document ... >> >> Bob >> >> On May 22, 2010, at 9:47 PM, Robert Darlington wrote: >> >>> Was there ever a standard? I always thought the "RS" stood for >>> Recommended Standard, as in "you *should* do the following" as >>> compared to "you shall do the following" I've seen inverted TTL talk >>> to the RS232 port on laptops and I even sometimes use the max233's >>> (+/- 10 volts instead of 12), but always use the full max232 with >>> external charge pumps when it's a gadget that needs to work everytime >>> with systems from multiple countries. >>> >>> -Bob >>> >>> On Sat, May 22, 2010 at 7:21 PM, Didier Juges <[email protected]> wrote: >>>> Bruce, >>>> >>>> Thanks for the additional information. >>>> >>>> +/- 14V is quite unusually low in my experience. I typically use Maxim parts > such as the MAX220 series, which is >>>> specified at +/-25V for no damage on the inputs (some parts in that series > go to +/-30V). >>>> >>>> The bottom line is that as I pointed out earlier, there is no such thing as > an RS-232 standard any more. >>>> >>>> Didier >>>> >>>> ------------------------ Sent from my BlackBerry Wireless thingy while I do > other things... >>>> >>>> -----Original Message----- >>>> From: Bruce Griffiths <[email protected]> >>>> Date: Sun, 23 May 2010 10:39:21 >>>> To: Discussion of precise time and frequency measurement<[email protected]> >>>> Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject) >>>> >>>> Didier Juges wrote: >>>>> Bill, I think you got it backwards. +/- 12V is typical for RS-232, 0/+5V is >>>>> for RS-422 and RS-485. >>>>> >>>>> No RS-232 receiver should be damaged with +/- 12V or even +/- 15V because >>>>> that is their normal operating voltage. >>>>> >>>>> Also, RS-422 and RS-485 have something like 25V common mode tolerance (not >>>>> sure what the actual spec is there,) so that the RS-422 and RS-485 > receivers >>>>> should not be damaged by 15V either. The RS-422 drivers are pretty low >>>>> impedance, while the RS-232 drivers are current limited, so I don't think >>>>> that connecting an RS-232 driver into an RS-422 driver will damage either. >>>>> >>>> Picking one RS485 receiver (ADM1485) at random the receiver absolute >>>> maximum (no damage) input range is -14V to +14V. >>>> The RS485 receiver operating common mode range is -7V to +12V. >>>> RS422 receivers have an input operating range of -7V to +7V. >>>> The no damage RS422 receiver input ratings may be higher. >>>>> However, most recent (<10 years?) RS-232 receivers will work with a 0/+3V > or >>>>> 0/+5V input, conveniently having a threshold a few 10's or 100's of mV > above >>>>> ground, even though the original RS-232 spec required receivers that work >>>>> with as low as +/- 3V, and drivers that deliver +/- 9V minimum. Many >>>>> commercial systems use +/- 5V drivers for RS-232 (B&B Electronics sells a >>>>> lot of converters with these voltages). This is a deliciously sloppy spec >>>>> that nobody has met in the last 25 years probably, yet works most of the >>>>> time. >>>>> >>>>> The one thing to avoid is to short an RS-422 (or RS-485) driver to ground, >>>>> as that can actually cause damage, maybe not every time, but definitely not >>>>> recommended. These have relatively high current output capability to drive >>>>> long lines. >>>>> >>>>> Didier KO4BB >>>>> >>>>> >>>>> >>>> Bruce >>>>> -----Original Message----- >>>>> From: [email protected] [mailto:[email protected]] On >>>>> Behalf Of Bill Hawkins >>>>> Sent: Saturday, May 22, 2010 3:09 PM >>>>> To: 'Discussion of precise time and frequency measurement' >>>>> Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject) >>>>> >>>>> When all else fails, get out the voltmeter. >>>>> >>>>> Do you have power to the antenna? Is it the right voltage? All the way to >>>>> the antenna? >>>>> >>>>> What volts are on pins 2 or 3 relative to pin 7 in the comm connector? >>>>> >>>>> If you see 12 volts, that's RS-422. You may have burned out your computer's >>>>> serial port. >>>>> >>>>> If you see less than 5 volts, that's RS-232 and all should be well, unless >>>>> you see zero volts. >>>>> >>>>> I may have the RS-xxx volts somewhat off because my memory isn't what it >>>>> used to be. >>>>> >>>>> The guy you bought it from should be able to help with comm basics. >>>>> >>>>> Bill Hawkins >>>>> >>>>> >>>>> -----Original Message----- >>>>> From: [email protected] [mailto:[email protected]] On >>>>> Behalf Of Robert Benward >>>>> Sent: Saturday, May 22, 2010 2:08 PM >>>>> To: Discussion of precise time and frequency measurement >>>>> Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject) >>>>> >>>>> Hi All, >>>>> I hooked everything up and I still get nothing. I can't seem to establish >>>>> communications with the Z3805. I tried a >>>>> null modem as well, in case the cable (supplied) was wired with the wrong >>>>> connector gender. I see a green blinking >>>>> light inside, it he left rear corner of the box. Everything is warm, but >>>>> nothing else. Any ideas? >>>>> >>>>> Bob >>>>> >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> 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. >>>>> >>>>> >>>> >>>> >>>> >>>> _______________________________________________ >>>> 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. >>>> >>> >>> _______________________________________________ >>> 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. >> > > > _______________________________________________ > 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. > _______________________________________________ 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.
Z3805A Info
MTI 261 5 mhz high stable oscillator
Milliren Technologies, Inc.
Model 260-0624-C
About the GPS module.
this inside the Z3805A will come with the
furuno GT-8031 come from japan.
NOT only 8 channels (Z3801A 6 channels ,Z3816A 8 channels ) ,
This module is 16 channels
GPS Receiver Modules GT-8031
Integrity is further improved because of its SBAS (WAAS) capability in addition
to traditional T-RAIM (Time-Receiver Autonomous Integrity Monitor) function.
Several new command sets have been added for easier use.
PPS output mode is available. For example, in "always output mode", 1PPS is
output without satellite signals using the receiver's internal timing (no UTC
synchronization). In "fixed observation point mode", one satellite signal is
enough to output UTC synchronized 1PPS. application is infinite.
Characteristics
* Low cost but powerful, fast 16 Channel GPS receiver
* Accuracy is not sacrificed 15 nanoseconds with regard to UTC (1 sigma).
* Low power consumption ([email protected]) at full tracking satellites
* RF pig tail cable with popular connector already soldered for easier,
more cost-effective installation.
* Almanac uploading and downloading.
* Autonomous transition from "Survey" to "Fixed Observation Point" lets the
receiver calculate its position and then use the averaged position as the fixed
observation point.
* "Back to fixed position set" allows you to go back to the fixed position
even after power-off.
Specifications
Numbers of channel 16 channels
Position-Fixing System All-In-View SPS (DGPS RTCM-SC104)
Frequency 1575.42 MHz
Tracking capability 12 Satellites simultaneously including 1 WAAS
supporting channel
Number of Parallel Searches 16
Protocol NMEA-Like
WAAS Support 1 Channel
Uses DGPS and functions to deselect unhealthy satellites
GPS-Fix data Renewal Rate 1 Second
1PPS Output UTC-Synchronized (1 pulse / second)
Acquisition / Tracking Specifications
Initial Acquisition Time 8.4 seconds Hot Start (Open Sky)
36 seconds Warm Start (Open Sky)
44.9 seconds Cold Start (Open Sky)
Re-acquisition Time 2 seconds
(-127 dBm or stronger signal interrupted for 10 seconds or less)
Horizontal Accuracy (2 drms) 5.6 m
Vertical Accuracy (2 drms) 7.3 m
Power Supply
Supply Voltage / Current Voltage: 3.0 to 3.6 VDC
Current: Max 72 mA at 3.6 VDC
External Back-up power Voltage: 2.1 to 3.6 VDC
Current: 200 uA when VCC = 3.6 VDC
Ambient Conditions Operating temperature: -30 - +80 degree
Storage temperature: -40 - +85 degree
Dimensions 20.8 mm (W) x 33.8 mm (D) x 6.3 mm (H)
Mass 8 g
<<attachment: Z3805 front.jpg>>
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