Author Topic: A look at my Symmetricom GPSDO / 10MHz reference (OCXO + Furuno receiver)  (Read 174295 times)

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Offline Vgkid

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Re: A look at my Symmetricom GPSDO / 10MHz reference (OCXO + Furuno receiver)
« Reply #100 on: January 24, 2016, 06:55:27 AM »
Thanks, I lost afew caps/ resistors when cleaning off the board. Ill let you know what else is missing.
im amazed how tiny the overall board is.
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Offline davebb

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Re: A look at my Symmetricom GPSDO / 10MHz reference (OCXO + Furuno receiver)
« Reply #101 on: January 24, 2016, 10:01:08 AM »
Hi are you shore it was your cleaning that did it, as I had some caps missing/broken and U25 5 pin inverter was ripped of the board with the tracks,
good luck we are all here to help,spend a lot of time looking at the board and the photos on here to see if you have missed anything,
I have just made a display board to show the gps data, http://www.f4ctz.fr/?page_id=692
and the moded HEX file from Daniel F1RMB
I made mine on some vero board,i have just powerd it up and so far it is all working I just need to wire up the NMEA data to it from the Symmetricom gps
Let us all know haw you are getting on with your board
Dave 2E0DMB
 

Offline Vgkid

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Re: A look at my Symmetricom GPSDO / 10MHz reference (OCXO + Furuno receiver)
« Reply #102 on: January 24, 2016, 03:49:47 PM »
On unit 1; replaced the cap. Powered it up, draws 2.2A @5.4v.the dc/dc converter is whining, 5v is present at the 5v test point, the ocxo is only getting 9.6v.
unit 2: there is 1 missing cap, c30, but there are 2 loose caps floating on the board. Hmm, better start looking for others.
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Online TheSteve

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Re: A look at my Symmetricom GPSDO / 10MHz reference (OCXO + Furuno receiver)
« Reply #103 on: January 24, 2016, 04:50:22 PM »
Sheesh, they really were just tossed on the scrape pile when salvaged weren't they. Should be 10 bucks each in the condition they're in.
VE7FM
 

Offline davebb

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Re: A look at my Symmetricom GPSDO / 10MHz reference (OCXO + Furuno receiver)
« Reply #104 on: January 24, 2016, 09:13:38 PM »
Hi you say that your input voltage is 5.4v,is that under load? as I found that the dc-dc do scream when just under volts,i am using a cheap adjustable dcdc powering mine so I can use a 12v supply,so I set it up with out load and when I  connected my Symmetricom  the dcdc on the  Symmetricom screamed and the output voltage wwas low like yours,so I then set it up under load and all was fine
Dave
 

Offline hs3

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Re: A look at my Symmetricom GPSDO / 10MHz reference (OCXO + Furuno receiver)
« Reply #105 on: January 25, 2016, 01:01:17 AM »
To satisfy my curiosity I also got one of these Symmetricom modules a while ago.

While testing I noticed that it seems to take a bit of a current spike when powering up.

Here are some examples at couple different input voltages. Power supply here was Rigol DP832 set to 3A current limit.

First 6V supply voltage:




5.5V supply voltage. Here the module was already warm. I think I had trouble powering it up also with 5.5V voltage in the past when it was cold. Same whining sound as with 5V when that happened.




5V supply voltage. Not starting, there is that whining sound from the board.




I have not tested how much larger the current spikes might be with a power supply without current limiting.
« Last Edit: January 25, 2016, 01:04:25 AM by hs3 »
 

Offline Vgkid

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Re: A look at my Symmetricom GPSDO / 10MHz reference (OCXO + Furuno receiver)
« Reply #106 on: January 25, 2016, 02:57:53 AM »
The 5.4v is under load, i will turn it up a few hundred mV.
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Offline davebb

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Re: A look at my Symmetricom GPSDO / 10MHz reference (OCXO + Furuno receiver)
« Reply #107 on: January 25, 2016, 03:13:52 AM »
Hi it should be up to voltage at that try another 100 or 200mv,reflow the solder joints on the dcdc,you will probably fine another 100mv will do it,you could allways get a cheap new dcdc adjustable buck boost new from china £1-2,

anyway I got my display working, the only thing it does not show all of my ,LON  W   0:56:00.451
what is good for us hams is it shows the locator
Dave 2E0DMB
 

Offline f1rmb

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Re: A look at my Symmetricom GPSDO / 10MHz reference (OCXO + Furuno receiver)
« Reply #108 on: January 25, 2016, 03:57:00 AM »
Hi it should be up to voltage at that try another 100 or 200mv,reflow the solder joints on the dcdc,you will probably fine another 100mv will do it,you could allways get a cheap new dcdc adjustable buck boost new from china £1-2,

anyway I got my display working, the only thing it does not show all of my ,LON  W   0:56:00.451
what is good for us hams is it shows the locator
Dave 2E0DMB

Yeah, I guess there's a bug in the original code: badly handling negative (W & S). If you want, I can build you another HEX file for testing purpose.

Cheers.
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Daniel
 

Offline davebb

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Re: A look at my Symmetricom GPSDO / 10MHz reference (OCXO + Furuno receiver)
« Reply #109 on: January 25, 2016, 04:11:18 AM »
Hi Daniel
Yes please that would be brill,i wish I could do that,
Thanks Dave 2E0DMB
 

Offline f1rmb

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Re: A look at my Symmetricom GPSDO / 10MHz reference (OCXO + Furuno receiver)
« Reply #110 on: January 25, 2016, 04:42:25 AM »
Hi Daniel
Yes please that would be brill,i wish I could do that,
Thanks Dave 2E0DMB

Here it is. Please tell me if it works, this way I can send the fix to the original author.


Cheers.
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Daniel
 

Offline davebb

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Re: A look at my Symmetricom GPSDO / 10MHz reference (OCXO + Furuno receiver)
« Reply #111 on: January 25, 2016, 04:52:08 AM »
That was fast,just going to try it thanks
,Dave
 

Offline davebb

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Re: A look at my Symmetricom GPSDO / 10MHz reference (OCXO + Furuno receiver)
« Reply #112 on: January 25, 2016, 05:14:45 AM »
Hi Daniel
All tested and working well  :-+
I just need a case now to put it all in, were did you find yours,
Thanks For your Help.
Dave 2E0DMB
 

Offline f1rmb

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Re: A look at my Symmetricom GPSDO / 10MHz reference (OCXO + Furuno receiver)
« Reply #113 on: January 25, 2016, 05:19:51 AM »
Hi Daniel
All tested and working well  :-+
I just need a case now to put it all in, were did you find yours,
Thanks For your Help.
Dave 2E0DMB

Great, this is a great news.

Well, I bought my case from an old stock in an old (closing) shop, locally (the packaging was looking from the 70's ;-) ).

BTW, where did you find your LCD display, do you have any URL ?

Cheers.
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Daniel
 



Offline davebb

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Re: A look at my Symmetricom GPSDO / 10MHz reference (OCXO + Furuno receiver)
« Reply #116 on: January 25, 2016, 07:00:03 AM »
No thank You,for all of your help,Daniel
can you please re write the original HEX file for the STD NMEA  SO I CAN USE IT WITH THE U-BLOX gps in the BG7TBL gpsdo so it displays all the LON in my loc,as I have another pic so I can make another one
Thanks Dave 2E0DMB
Have you stll got your ft817, I must get out with my one,
Thanks Dave
 

Offline f1rmb

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Re: A look at my Symmetricom GPSDO / 10MHz reference (OCXO + Furuno receiver)
« Reply #117 on: January 25, 2016, 07:04:37 AM »
No thank You,for all of your help,Daniel
can you please re write the original HEX file for the STD NMEA  SO I CAN USE IT WITH THE U-BLOX gps in the BG7TBL gpsdo so it displays all the LON in my loc,as I have another pic so I can make another one
Thanks Dave 2E0DMB
Have you stll got your ft817, I must get out with my one,
Thanks Dave

Okay, but I'll do that tomorrow (I think F4CTZ will made a similar update on his website).

Yeah, I still have my 817, it's really a nice piece of equipment :-) (and even much more with the BHI audio DSP module).

Cheers.
---
Daniel
 

Offline davebb

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Re: A look at my Symmetricom GPSDO / 10MHz reference (OCXO + Furuno receiver)
« Reply #118 on: January 25, 2016, 07:14:59 AM »
Thanks No rush,
Yes the BHI dsp works very well I fitted one in my old 817 that I sold,
But then I got another 817 and I do miss the dsp, but I do have the 10w dsp speaker from them,
Are you going to gpsdo lock your 817 :-+
Thanks Dave
 

Offline f1rmb

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Re: A look at my Symmetricom GPSDO / 10MHz reference (OCXO + Furuno receiver)
« Reply #119 on: January 25, 2016, 07:19:33 AM »
Thanks No rush,
Yes the BHI dsp works very well I fitted one in my old 817 that I sold,
But then I got another 817 and I do miss the dsp, but I do have the 10w dsp speaker from them,
Are you going to gpsdo lock your 817 :-+
Thanks Dave

I don't think so ;-) I fitted a TCXO-9 already, enough for HF bands ;-)

Cheers.
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Daniel
 

Offline davebb

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Re: A look at my Symmetricom GPSDO / 10MHz reference (OCXO + Furuno receiver)
« Reply #120 on: January 25, 2016, 07:45:04 AM »
Yes I know but,
Same here for the 817,
like I posted I am going to fit it to my TS-2000 and I have locked my 4m transverter, very overkill,
Dave
 

Offline f1rmb

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Re: A look at my Symmetricom GPSDO / 10MHz reference (OCXO + Furuno receiver)
« Reply #121 on: January 25, 2016, 07:51:10 AM »
Here is the "original" version, decoding real NMEA sentences.


Cheers.
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Daniel
 

Offline davebb

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Re: A look at my Symmetricom GPSDO / 10MHz reference (OCXO + Furuno receiver)
« Reply #122 on: January 25, 2016, 08:08:54 AM »
Thanks ,You know your Stuff,
I am only a prototype Wireman
We will Have to Talk on 20 OR 40meters
Thanks Dave
 

Offline f1rmb

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Re: A look at my Symmetricom GPSDO / 10MHz reference (OCXO + Furuno receiver)
« Reply #123 on: January 25, 2016, 08:17:49 AM »
Thanks ,You know your Stuff,
I am only a prototype Wireman
We will Have to Talk on 20 OR 40meters
Thanks Dave

Why not ;-)
 

Online TheSteve

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Re: A look at my Symmetricom GPSDO / 10MHz reference (OCXO + Furuno receiver)
« Reply #124 on: January 25, 2016, 08:54:57 AM »
Has anyone considered using TOD serial data the Symmetricom/Trimble GPSDO's can output every 2 seconds instead of the raw data?

btw, I have an FT817ND too, great rig.
VE7FM
 


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