Has anybody checked this? GPSDO in kit
Hi
There is a long list of information on that unit over on EEVBlog. Bottom line is
that if you get a good one (you may not) it is a much better solution than the other
one you are looking at.
Bob
On Oct 23, 2016, at 9:32 AM, Giuseppe Marullo giuseppe@marullo.it wrote:
Thanks to all that have answered, as usual very good advices.
I am puzzled about what to do, still the total cost of it for a OXCO + GPS(unit with antenna) + control mcu is 67usd, I doubt I could find anything like this for a cheaper price new.
Only cheap alternative could be this one(already discussed here one year ago):
http://www.ebay.com/itm/141734507722?_trksid=p2057872.m2749.l2649
Would this allow me to play as the "standard" ThunderBolt using the same software? Any preferred model among
63090/73090/65256 "models"?
Giuseppe Marullo
IW2JWW - JN45RQ
PS: Still I like the idea of the kit...the trimble would require PSU, antenna, boxing and no fancy display...
On 10/22/2016 4:02 PM, Giuseppe Marullo wrote:
Hello,
I know, I know it is not supposed to be high end stuff(timenutted), but I was looking for a GPS clock and noticed that this could be a cheap GPSDO too:
http://qrp-labs.com/progrock.html
It has a OCXO option, a box, a display(customizable), a GPS and could be probably fitted with a Raspberry Zero for a cheap NTP server too.
Any advice?
Sorry if this has been already discussed here, didn't find any reference in the ML.
Could it be compared to a Thunderbolt GPSO in terms of performance, how worse it could be?
I just need a clean/self-calibrating 10MHz reference to tune HF radios ...seems good enough for the price.
Giuseppe Marullo
IW2JWW - JN45RQ
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.
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and follow the instructions there.
On 10/22/2016 9:22 AM, Chris Albertson wrote:
You have to remember what this thing replaces. In ham radio, some people
are using vacuum tube oscillators with mechanical variable capacitor
tuning. Maybe some advanced rigs use gear drive on the capacitor shaft to
allow more exact tuning This Si chip is considerably better then 1940's
technology.
I guess my WW-II vintage BC342 receiver (that I started with and still own) was
"advanced". It has an extensive gear train for tuning.
On the other hand my two Elecraft K3s are full of DDS and microprocessors but no
variable capacitors.
Flex radios, are direct sampling SDR and newer ones offer GPS stabilization.
On Sun, 23 Oct 2016 15:32:33 +0200
Giuseppe Marullo giuseppe@marullo.it wrote:
I am puzzled about what to do, still the total cost of it for a OXCO +
GPS(unit with antenna) + control mcu is 67usd, I doubt I could find
anything like this for a cheaper price new.
Yes, it's cheap for a kit, but it is not that cheap if you want to be cheap. :-)
You can get GPS modules for as low as $5 on ebay (these are new),
a uC board for another $10-30 (even cheaper on ebay) and a quite good
OCXO for $10-30, also from ebay. A few wires, a bit of programming and
you have an GPSDO that beats the progrock. So, by buying the right stuff
you can stay below $30 and have something that will get you a long way
for experimenting.
Just for the fun of it:
http://www.ebay.com/itm/STM32F030F4P6-ARM-CORTEX-M0-Core-Mini-System-Development-Board-5V-3-3V-/371769616187?hash=item568f32273b:g:seAAAOSwXeJYCx63
$1.40
http://www.ebay.com/itm/MCP4725-I2C-DAC-Breakout-Development-Board-12Bit-Resolution-/401209928223?hash=item5d69f9aa1f:g:j5gAAOSw34FVH5b1
$1
http://www.ebay.com/itm/Aircraft-Flight-Controller-w-Ublox-NEO-6M-GPS-Module-for-Arduino-APM2-/182318966076?hash=item2a730ea53c:g:QuoAAOSwOVpXc3K~
$5.04
http://www.ebay.com/itm/1-USED-ISOTEMP-OCXO-143-141-10-MHz-5V-SC-CUT-Square-Wave-Crystal-Oscillator-/331997554003?hash=item4d4c98a553:g:w~sAAOSwCGVX~g24
$16
Total cost: ~$25 including shipping and all but the OCXO are new.
You will need programmer for the uC board, if you don't have that, change
the uC board for an STM32F0DISCOVERY board:
http://eu.mouser.com/ProductDetail/STMicroelectronics/STM32F0DISCOVERY
Of course, any "real" GPSDO will beat this one by orders of magnitude
in phase noise and stability, but they are also much less fun to build :-)
Attila Kinali
--
Malek's Law:
Any simple idea will be worded in the most complicated way.
Bravo for boat anchors, Wes. I have a Collins R390 with a tuning gear train
so complex it has to go in every 3000 miles for an oil change.
On Sunday, October 23, 2016, Wes wes@triconet.org wrote:
On 10/22/2016 9:22 AM, Chris Albertson wrote:
You have to remember what this thing replaces. In ham radio, some people
are using vacuum tube oscillators with mechanical variable capacitor
tuning. Maybe some advanced rigs use gear drive on the capacitor shaft to
allow more exact tuning This Si chip is considerably better then 1940's
technology.
I guess my WW-II vintage BC342 receiver (that I started with and still
own) was "advanced". It has an extensive gear train for tuning.
On the other hand my two Elecraft K3s are full of DDS and microprocessors
but no variable capacitors.
Flex radios, are direct sampling SDR and newer ones offer GPS
stabilization.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/m
ailman/listinfo/time-nuts
and follow the instructions there.
--
If you gaze long into an abyss, your coffee will get cold.
Nice!
(I had one of those, 20 years ago . . . .)
73,
Jim
On 10/23/2016 1:49 PM, William H. Fite wrote:
Bravo for boat anchors, Wes. I have a Collins R390 with a tuning gear train
so complex it has to go in every 3000 miles for an oil change.
On Sunday, October 23, 2016, Wes wes@triconet.org wrote:
On 10/22/2016 9:22 AM, Chris Albertson wrote:
You have to remember what this thing replaces. In ham radio, some people
are using vacuum tube oscillators with mechanical variable capacitor
tuning. Maybe some advanced rigs use gear drive on the capacitor shaft to
allow more exact tuning This Si chip is considerably better then 1940's
technology.
I guess my WW-II vintage BC342 receiver (that I started with and still
own) was "advanced". It has an extensive gear train for tuning.
On the other hand my two Elecraft K3s are full of DDS and microprocessors
but no variable capacitors.
Flex radios, are direct sampling SDR and newer ones offer GPS
stabilization.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/m
ailman/listinfo/time-nuts
and follow the instructions there.
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus
The link on EEVblog is http://www.eevblog.com/forum/projects/a-look-at-my-symmetricom-gpsdo-(ocxo-furuno-receiver)/
the Symmetricom and the Trimble you referenced are almost identical in operation. Issue is receiving one that works, a bit hit and miss. Apparently the next version of Lady heather will be able to monitor it. With the Symmetricom you are somewhat limited to what settings you can apply to tweak it, at least as to what limited documentation is available to do so. If you have a decent antenna and a good view of the sky you should be fine.
NOTE be careful with the voltages that may be quoted. The Trimble's are NOT 12v. search Time-Nuts for more info
-=Bryan=-
From: time-nuts time-nuts-bounces@febo.com on behalf of Bob Camp kb8tq@n1k.org
Sent: October 23, 2016 6:56 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Has anybody checked this? GPSDO in kit
Hi
There is a long list of information on that unit over on EEVBlog. Bottom line is
that if you get a good one (you may not) it is a much better solution than the other
one you are looking at.
Bob
On Oct 23, 2016, at 9:32 AM, Giuseppe Marullo giuseppe@marullo.it wrote:
Thanks to all that have answered, as usual very good advices.
I am puzzled about what to do, still the total cost of it for a OXCO + GPS(unit with antenna) + control mcu is 67usd, I doubt I could find anything like this for a cheaper price new.
Only cheap alternative could be this one(already discussed here one year ago):
http://www.ebay.com/itm/141734507722?_trksid=p2057872.m2749.l2649
[http://i.ebayimg.com/images/i/141734507722-0-1/s-l1000.jpg]http://www.ebay.com/itm/141734507722?_trksid=p2057872.m2749.l2649
Used Tested 10MHz Trimble 63090/73090/65256 GPS board OCXO | eBayhttp://www.ebay.com/itm/141734507722?_trksid=p2057872.m2749.l2649
www.ebay.com
Note : this item is used ,but Good quality. | eBay!
Would this allow me to play as the "standard" ThunderBolt using the same software? Any preferred model among
63090/73090/65256 "models"?
Giuseppe Marullo
IW2JWW - JN45RQ
PS: Still I like the idea of the kit...the trimble would require PSU, antenna, boxing and no fancy display...
On 10/22/2016 4:02 PM, Giuseppe Marullo wrote:
Hello,
I know, I know it is not supposed to be high end stuff(timenutted), but I was looking for a GPS clock and noticed that this could be a cheap GPSDO too:
ProgRock - triple programmable crystal - QRP Labshttp://qrp-labs.com/progrock.html
qrp-labs.com
This kit is a simple minimalist controller for the Si5351A Synth kit (included with the ProgRock kit). It is intended as a programmable crystal replacement.
It has a OCXO option, a box, a display(customizable), a GPS and could be probably fitted with a Raspberry Zero for a cheap NTP server too.
Any advice?
Sorry if this has been already discussed here, didn't find any reference in the ML.
Could it be compared to a Thunderbolt GPSO in terms of performance, how worse it could be?
I just need a clean/self-calibrating 10MHz reference to tune HF radios ...seems good enough for the price.
Giuseppe Marullo
IW2JWW - JN45RQ
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Hello Attila,
not cheap at that point, and I already have that ST board(I live few km
from ST headquarters, BTW)!.
Still licking my wounds from Eclipse-whatever chaintool, ouch, no way I
am going to mess with that again anytime soon.
I am not in the mood to start another endless project, way too many
unfinished stull in my drawers(as many others I guess).
I like the qrp-kit kit, but I will have a good look at eevb for the
"thunderbolt in disguise" and then I will decide.
Thanks.
Giuseppe Marullo
IW2JWW - JN45RQ
On 10/23/2016 5:52 PM, Attila Kinali wrote:
On Sun, 23 Oct 2016 15:32:33 +0200
Giuseppe Marullo giuseppe@marullo.it wrote:
I am puzzled about what to do, still the total cost of it for a OXCO +
GPS(unit with antenna) + control mcu is 67usd, I doubt I could find
anything like this for a cheaper price new.
Yes, it's cheap for a kit, but it is not that cheap if you want to be cheap. :-)
You can get GPS modules for as low as $5 on ebay (these are new),
a uC board for another $10-30 (even cheaper on ebay) and a quite good
OCXO for $10-30, also from ebay. A few wires, a bit of programming and
you have an GPSDO that beats the progrock. So, by buying the right stuff
you can stay below $30 and have something that will get you a long way
for experimenting.
Just for the fun of it:
http://www.ebay.com/itm/STM32F030F4P6-ARM-CORTEX-M0-Core-Mini-System-Development-Board-5V-3-3V-/371769616187?hash=item568f32273b:g:seAAAOSwXeJYCx63
$1.40
http://www.ebay.com/itm/MCP4725-I2C-DAC-Breakout-Development-Board-12Bit-Resolution-/401209928223?hash=item5d69f9aa1f:g:j5gAAOSw34FVH5b1
$1
http://www.ebay.com/itm/Aircraft-Flight-Controller-w-Ublox-NEO-6M-GPS-Module-for-Arduino-APM2-/182318966076?hash=item2a730ea53c:g:QuoAAOSwOVpXc3K~
$5.04
http://www.ebay.com/itm/1-USED-ISOTEMP-OCXO-143-141-10-MHz-5V-SC-CUT-Square-Wave-Crystal-Oscillator-/331997554003?hash=item4d4c98a553:g:w~sAAOSwCGVX~g24
$16
Total cost: ~$25 including shipping and all but the OCXO are new.
You will need programmer for the uC board, if you don't have that, change
the uC board for an STM32F0DISCOVERY board:
http://eu.mouser.com/ProductDetail/STMicroelectronics/STM32F0DISCOVERY
Of course, any "real" GPSDO will beat this one by orders of magnitude
in phase noise and stability, but they are also much less fun to build :-)
Attila Kinali
I ended up buying a pre-cooked Trimble plus a missilehead-like GPS antenna:
http://www.ebay.it/itm/252162780444?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
http://www.ebay.it/itm/262679152903?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
This should limit the chance it would be a DOA(well I hope at least), it
comes already boxed, has somewhat a wide power supply voltage range, no
pigtails to play with, and the antenna is new.
Now I just need to prepare the cable for the antenna, the mounting pole
and wait them to arrive through snail mail.
Many thanks to all but especially to Larry McDavid W6FUB that helped me
a lot to decide.
Now, while I wait...
-
I am reading the thread on EEVBlog(Thanks Bob and Bryan), (I have
like one month before I receive the unit so I could have spent more, I
admit) but I have several questions:a) Is this a board or a puzzle? seems that brings reverse
engineering to a whole new level. 32 pages of forum posts looking for
missing parts...LOLb) which is the difference between the Symmetrical and Trimble
unit? I am mostly interested in interfacing, like the ability to get
also NMEA sentences (if possible) and the ability to add the KOBB
display. In the thread there are a lot of information but really not
sure how much is common between the two. Only sure thing I have
understood seems that Trimble does not initiate a Survey at power on.c) since I may like to use the GPS antenna also for the clock
kit(I WANT a DISPLAY!), I would like to build/buy a simple spitter.
Just a second output. I hope that a passive cheap schematic would do.
BTW, on which frequencies this unit receive data? Just 1575.42MHz? Would
it be possible to build a Wilkinson splitter?d) still confused about the number of serial ports available, their
expected usage and voltage levels.e) Which is the antenna signal level (dBm) that this unit require
to operate properly?
Giuseppe Marullo
IW2JWW - JN45RQ
On 10/24/2016 1:05 AM, Giuseppe Marullo wrote:
Hello Attila,
not cheap at that point, and I already have that ST board(I live few
km from ST headquarters, BTW)!.
Still licking my wounds from Eclipse-whatever chaintool, ouch, no way
I am going to mess with that again anytime soon.
I am not in the mood to start another endless project, way too many
unfinished stull in my drawers(as many others I guess).
I like the qrp-kit kit, but I will have a good look at eevb for the
"thunderbolt in disguise" and then I will decide.
Thanks.
Giuseppe Marullo
IW2JWW - JN45RQ
On 10/23/2016 5:52 PM, Attila Kinali wrote:
On Sun, 23 Oct 2016 15:32:33 +0200
Giuseppe Marullo giuseppe@marullo.it wrote:
I am puzzled about what to do, still the total cost of it for a OXCO +
GPS(unit with antenna) + control mcu is 67usd, I doubt I could find
anything like this for a cheaper price new.
Yes, it's cheap for a kit, but it is not that cheap if you want to be
cheap. :-)
You can get GPS modules for as low as $5 on ebay (these are new),
a uC board for another $10-30 (even cheaper on ebay) and a quite good
OCXO for $10-30, also from ebay. A few wires, a bit of programming and
you have an GPSDO that beats the progrock. So, by buying the right stuff
you can stay below $30 and have something that will get you a long way
for experimenting.
Just for the fun of it:
$16
Total cost: ~$25 including shipping and all but the OCXO are new.
You will need programmer for the uC board, if you don't have that,
change
the uC board for an STM32F0DISCOVERY board:
http://eu.mouser.com/ProductDetail/STMicroelectronics/STM32F0DISCOVERY
Of course, any "real" GPSDO will beat this one by orders of magnitude
in phase noise and stability, but they are also much less fun to
build :-)
Attila Kinali
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.
<< e) Which is the antenna signal level (dBm) that this unit require
<<to operate properly?>>
The antenna you referenced should be fine. I would hazard to guess<g> that antennas a re a whole separate topic. The gain should be fine. What you need is a clear unobstructed view of the sky. That can be challenging depending on your location. Note that you will likely need some different connectors as the antenna looks to have a "N" type connector. You should also try and use cabling that I suitable and does not cause significant signal loss.
As for splitting remember that it is a active antenna and expects 5 volts so not sure if the Wilkinson splitter would work??. I would be interested as to what others have to say about splitting the antenna. Have read that a common television satellite antenna splitter commonly found on Ebay can be used, but the impedance may be 75 ohms and the connectors would have to be changed.
<< b) which is the difference between the Symmetrical and Trimble
<<unit? I am mostly interested in interfacing, like the ability to get
<<also NMEA sentences (if possible) and the ability to add the KOBB
<<display. In the thread there are a lot of information but really not
<<sure how much is common between the two. Only sure thing I have
<<understood seems that Trimble does not initiate a Survey at power on.
I had the Symmetricom so can't tell you much about the difference other that from what other posters have contributed they are very close to if not identical in many respects.Not having to complete another survey on power up is a definite plus on the Trimble, but I found that it can complete a survey on the Symmetricom quite quickly.
There is a number of serial ports on these boards. Looking at the fifth picture on the ebay link, at the top left corner next to the SMA connector just below R13 is a vertical row of holes. That is the main serial connection and it is at TTL levels. There is other serial connections available on a ribbon like connector at the end of the board. Posts on the EEVBlog show where and the pins on the ribbon connector and what they do. One poster on EEVblog probed the ribbon connector and identified the pins. http://tipok.org.ua/node/53. Some of the UART are high voltage, others TTL
[http://tipok.org.ua/sites/default/files/gps_rx_lores.jpg]http://tipok.org.ua/node/53
Trimble/Symmetricom UCCM GPS Receiver 50-pin connector ...http://tipok.org.ua/node/53
tipok.org.ua
Introduction. This page describes the pinouts of 50-pin connector, avaliable at "Trimble 57963-C" and "Symmetricom UCCM 089-03861-02" boards, which can be bought on Ebay.
Unfortunately they don't show the backside of the board in the Ebay link, but I strongly suspect as the main serial connection does not look populated by any wiring in the picture, they are tapping into the rx pin of the GPS receiver as the source for one of the RS232 connectors. This is a source of NMEA statements and is documented on the EEVblog. You can't send any commands put it does send out a continuous stream of useful NMEA commands that make it a ideal source for a DIY project to add a display. Once you receive your unit and connect it to your pc you will (should) see a stream of NMEA commands from one of the RS232 ports.
Hope this helps. I unfortunately toasted mine, and was contemplating about picking up another one.
-=Bryan=-
From: time-nuts time-nuts-bounces@febo.com on behalf of Giuseppe Marullo giuseppe@marullo.it
Sent: October 29, 2016 11:10 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Has anybody checked this? GPSDO in kit
I ended up buying a pre-cooked Trimble plus a missilehead-like GPS antenna:
http://www.ebay.it/itm/252162780444?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
Trimble GPS Receiver GPSDO 10MHz 1PPS GPS Disciplined Clock with rs232 port | eBayhttp://www.ebay.it/itm/252162780444?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
www.ebay.it
Trimble GPS Receiver GPSDO 10MHz 1PPS GPS Disciplined Clock with rs232 port | | eBay!
http://www.ebay.it/itm/262679152903?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
PCTEL GPS (L1) 26dB TIMING ANTENNA KIT GPS-TMG-26N W/ Mount Kit | eBayhttp://www.ebay.it/itm/262679152903?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
www.ebay.it
PCTEL GPS (L1) 26dB TIMING ANTENNA KIT GPS-TMG-26N W/ Mount Kit | | eBay!
This should limit the chance it would be a DOA(well I hope at least), it
comes already boxed, has somewhat a wide power supply voltage range, no
pigtails to play with, and the antenna is new.
Now I just need to prepare the cable for the antenna, the mounting pole
and wait them to arrive through snail mail.
Many thanks to all but especially to Larry McDavid W6FUB that helped me
a lot to decide.
Now, while I wait...
-
I am reading the thread on EEVBlog(Thanks Bob and Bryan), (I have
like one month before I receive the unit so I could have spent more, I
admit) but I have several questions:a) Is this a board or a puzzle? seems that brings reverse
engineering to a whole new level. 32 pages of forum posts looking for
missing parts...LOLb) which is the difference between the Symmetrical and Trimble
unit? I am mostly interested in interfacing, like the ability to get
also NMEA sentences (if possible) and the ability to add the KOBB
display. In the thread there are a lot of information but really not
sure how much is common between the two. Only sure thing I have
understood seems that Trimble does not initiate a Survey at power on.c) since I may like to use the GPS antenna also for the clock
kit(I WANT a DISPLAY!), I would like to build/buy a simple spitter.
Just a second output. I hope that a passive cheap schematic would do.
BTW, on which frequencies this unit receive data? Just 1575.42MHz? Would
it be possible to build a Wilkinson splitter?d) still confused about the number of serial ports available, their
expected usage and voltage levels.e) Which is the antenna signal level (dBm) that this unit require
to operate properly?
Giuseppe Marullo
IW2JWW - JN45RQ
On 10/24/2016 1:05 AM, Giuseppe Marullo wrote:
Hello Attila,
not cheap at that point, and I already have that ST board(I live few
km from ST headquarters, BTW)!.
Still licking my wounds from Eclipse-whatever chaintool, ouch, no way
I am going to mess with that again anytime soon.
I am not in the mood to start another endless project, way too many
unfinished stull in my drawers(as many others I guess).
I like the qrp-kit kit, but I will have a good look at eevb for the
"thunderbolt in disguise" and then I will decide.
Thanks.
Giuseppe Marullo
IW2JWW - JN45RQ
On 10/23/2016 5:52 PM, Attila Kinali wrote:
On Sun, 23 Oct 2016 15:32:33 +0200
Giuseppe Marullo giuseppe@marullo.it wrote:
I am puzzled about what to do, still the total cost of it for a OXCO +
GPS(unit with antenna) + control mcu is 67usd, I doubt I could find
anything like this for a cheaper price new.
Yes, it's cheap for a kit, but it is not that cheap if you want to be
cheap. :-)
You can get GPS modules for as low as $5 on ebay (these are new),
a uC board for another $10-30 (even cheaper on ebay) and a quite good
OCXO for $10-30, also from ebay. A few wires, a bit of programming and
you have an GPSDO that beats the progrock. So, by buying the right stuff
you can stay below $30 and have something that will get you a long way
for experimenting.
Just for the fun of it:
[http://i.ebayimg.com/images/i/371769616187-0-1/s-l1000.jpg]http://www.ebay.com/itm/STM32F030F4P6-ARM-CORTEX-M0-Core-Mini-System-Development-Board-5V-3-3V-/371769616187?hash=item568f32273b:g:seAAAOSwXeJYCx63
STM32F030F4P6 ARM CORTEX-M0 Core Mini System Development Board 5V/3.3V | eBayhttp://www.ebay.com/itm/STM32F030F4P6-ARM-CORTEX-M0-Core-Mini-System-Development-Board-5V-3-3V-/371769616187?hash=item568f32273b:g:seAAAOSwXeJYCx63
www.ebay.com
This board is a STM32F030F4P6 Minimum System Board(Cortex-M0). The target MCU is STM32F030F4P6 that is provided by ST. It is a ARM 32-bit Cortex?. -M0 CPU, frequency up to 48 MHz, high-speed embedded memories. | eBay!
[http://i.ebayimg.com/images/i/401209928223-0-1/s-l1000.jpg]http://www.ebay.com/itm/MCP4725-I2C-DAC-Breakout-Development-Board-12Bit-Resolution-/401209928223?hash=item5d69f9aa1f:g:j5gAAOSw34FVH5b1
MCP4725 I2C DAC Breakout Development Board 12Bit Resolution | eBayhttp://www.ebay.com/itm/MCP4725-I2C-DAC-Breakout-Development-Board-12Bit-Resolution-/401209928223?hash=item5d69f9aa1f:g:j5gAAOSw34FVH5b1
www.ebay.com
This version of the CJMCU-MCP4725 Breakout fixes a few issues with the board including the IC footprint, the I2C pinout, changes the overall board dimensions to better fit your projects, and a few more minor tweaks. | eBay!
[http://i.ebayimg.com/images/i/182318966076-0-1/s-l1000.jpg]http://www.ebay.com/itm/Aircraft-Flight-Controller-w-Ublox-NEO-6M-GPS-Module-for-Arduino-APM2-/182318966076?hash=item2a730ea53c:g:QuoAAOSwOVpXc3K~
Aircraft Flight Controller /w Ublox NEO-6M GPS Module for Arduino APM2 | eBayhttp://www.ebay.com/itm/Aircraft-Flight-Controller-w-Ublox-NEO-6M-GPS-Module-for-Arduino-APM2-/182318966076?hash=item2a730ea53c:g:QuoAAOSwOVpXc3K~
www.ebay.com
1pcs Ublox NEO-6M GPS Module Aircraft Flight Controller For Arduino MWC IMU APM2. Compatible with various flight controller module. Module with ceramic active antenna. Module size:23 x 30mm. We can also provide customized design and manufacture services. | eBay!
[http://i.ebayimg.com/images/i/331997554003-0-1/s-l1000.jpg]http://www.ebay.com/itm/1-USED-ISOTEMP-OCXO-143-141-10-MHz-5V-SC-CUT-Square-Wave-Crystal-Oscillator-/331997554003?hash=item4d4c98a553:g:w~sAAOSwCGVX~g24
1×USED ISOTEMP OCXO 143-141 10 MHz 5V SC-CUT Square Wave Crystal Oscillator | eBayhttp://www.ebay.com/itm/1-USED-ISOTEMP-OCXO-143-141-10-MHz-5V-SC-CUT-Square-Wave-Crystal-Oscillator-/331997554003?hash=item4d4c98a553:g:w~sAAOSwCGVX~g24
www.ebay.com
Conditiion: Used. I promise I can give you satisfying solution. It is good for you and for me! I try my best to select good products to you and service you sincerely. Rate (item arrived). | eBay!
$16
Total cost: ~$25 including shipping and all but the OCXO are new.
You will need programmer for the uC board, if you don't have that,
change
the uC board for an STM32F0DISCOVERY board:
http://eu.mouser.com/ProductDetail/STMicroelectronics/STM32F0DISCOVERY
[http://eu.mouser.com/images/stmicroelectronics/images/64824_fig2.jpg]http://eu.mouser.com/ProductDetail/STMicroelectronics/STM32F0DISCOVERY
STM32F0DISCOVERY STMicroelectronics | Mouserhttp://eu.mouser.com/ProductDetail/STMicroelectronics/STM32F0DISCOVERY
eu.mouser.com
STM32F0DISCOVERY STMicroelectronics Development Boards & Kits - ARM Discovery F0 Board 32-Bit ARM Cortex M0 datasheet, inventory & pricing.
Of course, any "real" GPSDO will beat this one by orders of magnitude
in phase noise and stability, but they are also much less fun to
build :-)
Attila Kinali
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Hi
Any pole mount outdoor antenna with a gain in the 20 to 30 db range should be
fine with any of these units. Cable loss can be an issue if it is getting the net
gain down below 10 db (antenna gain - cable loss). The frequency is 1.5 GHz
so a quick look at the standard tables should give you an idea what the loss
of any specific cable would be.
Trimble and Symmetricom made a number of “twin” units over the years. They
went into the same application, but did not function identically on the serial side.
The OEM apparently was expected to deal with two different interfaces. Things
like power in and timing signals out would be identical for the two designs.
Bob
On Oct 30, 2016, at 2:10 AM, Giuseppe Marullo giuseppe@marullo.it wrote:
I ended up buying a pre-cooked Trimble plus a missilehead-like GPS antenna:
http://www.ebay.it/itm/252162780444?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
http://www.ebay.it/itm/262679152903?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
This should limit the chance it would be a DOA(well I hope at least), it comes already boxed, has somewhat a wide power supply voltage range, no pigtails to play with, and the antenna is new.
Now I just need to prepare the cable for the antenna, the mounting pole and wait them to arrive through snail mail.
Many thanks to all but especially to Larry McDavid W6FUB that helped me a lot to decide.
Now, while I wait...
-
I am reading the thread on EEVBlog(Thanks Bob and Bryan), (I have like one month before I receive the unit so I could have spent more, I admit) but I have several questions:
a) Is this a board or a puzzle? seems that brings reverse engineering to a whole new level. 32 pages of forum posts looking for missing parts...LOL
b) which is the difference between the Symmetrical and Trimble unit? I am mostly interested in interfacing, like the ability to get also NMEA sentences (if possible) and the ability to add the KOBB display. In the thread there are a lot of information but really not sure how much is common between the two. Only sure thing I have understood seems that Trimble does not initiate a Survey at power on.
c) since I may like to use the GPS antenna also for the clock kit(I WANT a DISPLAY!), I would like to build/buy a simple spitter. Just a second output. I hope that a passive cheap schematic would do. BTW, on which frequencies this unit receive data? Just 1575.42MHz? Would it be possible to build a Wilkinson splitter?
d) still confused about the number of serial ports available, their expected usage and voltage levels.
e) Which is the antenna signal level (dBm) that this unit require to operate properly?
Giuseppe Marullo
IW2JWW - JN45RQ
On 10/24/2016 1:05 AM, Giuseppe Marullo wrote:
Hello Attila,
not cheap at that point, and I already have that ST board(I live few km from ST headquarters, BTW)!.
Still licking my wounds from Eclipse-whatever chaintool, ouch, no way I am going to mess with that again anytime soon.
I am not in the mood to start another endless project, way too many unfinished stull in my drawers(as many others I guess).
I like the qrp-kit kit, but I will have a good look at eevb for the "thunderbolt in disguise" and then I will decide.
Thanks.
Giuseppe Marullo
IW2JWW - JN45RQ
On 10/23/2016 5:52 PM, Attila Kinali wrote:
On Sun, 23 Oct 2016 15:32:33 +0200
Giuseppe Marullo giuseppe@marullo.it wrote:
I am puzzled about what to do, still the total cost of it for a OXCO +
GPS(unit with antenna) + control mcu is 67usd, I doubt I could find
anything like this for a cheaper price new.
Yes, it's cheap for a kit, but it is not that cheap if you want to be cheap. :-)
You can get GPS modules for as low as $5 on ebay (these are new),
a uC board for another $10-30 (even cheaper on ebay) and a quite good
OCXO for $10-30, also from ebay. A few wires, a bit of programming and
you have an GPSDO that beats the progrock. So, by buying the right stuff
you can stay below $30 and have something that will get you a long way
for experimenting.
Just for the fun of it:
http://www.ebay.com/itm/STM32F030F4P6-ARM-CORTEX-M0-Core-Mini-System-Development-Board-5V-3-3V-/371769616187?hash=item568f32273b:g:seAAAOSwXeJYCx63
$1.40
http://www.ebay.com/itm/MCP4725-I2C-DAC-Breakout-Development-Board-12Bit-Resolution-/401209928223?hash=item5d69f9aa1f:g:j5gAAOSw34FVH5b1
$1
http://www.ebay.com/itm/Aircraft-Flight-Controller-w-Ublox-NEO-6M-GPS-Module-for-Arduino-APM2-/182318966076?hash=item2a730ea53c:g:QuoAAOSwOVpXc3K~
$5.04
http://www.ebay.com/itm/1-USED-ISOTEMP-OCXO-143-141-10-MHz-5V-SC-CUT-Square-Wave-Crystal-Oscillator-/331997554003?hash=item4d4c98a553:g:w~sAAOSwCGVX~g24
$16
Total cost: ~$25 including shipping and all but the OCXO are new.
You will need programmer for the uC board, if you don't have that, change
the uC board for an STM32F0DISCOVERY board:
http://eu.mouser.com/ProductDetail/STMicroelectronics/STM32F0DISCOVERY
Of course, any "real" GPSDO will beat this one by orders of magnitude
in phase noise and stability, but they are also much less fun to build :-)
Attila Kinali
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.