Re: [time-nuts] Brandywine GPS-4 OCXO

[Magnus Danielson]

Hi,
Sure, but emailing from the airport put a limit on that aspect. 
Cheers, Magnus 

 Originalmeddelande 
Från: Bob kb8tq <kb...@n1k.org> 
Datum: 2017-05-20  14:22  (GMT+01:00) 
Till: Discussion of precise time and frequency measurement <time-nuts@febo.com> 
Kopia: mag...@rubidium.se 
Rubrik: Re: [time-nuts] Brandywine GPS-4 OCXO 

Hi

Pictures probably would help :)

Bob

> On May 20, 2017, at 8:00 AM, Magnus Danielson <mag...@rubidium.dyndns.org> 
> wrote:
> 
> Hi,
> 
> Does someone happen to know what OCXO sits in the Brandywine GPS-4 GPSDO? 
> It's pretty good sized OCXO, possibly double-oven. It has a screw on the side 
> which I presume opens up to the trimmer position.
> 
> If someone could share info it would be useful.
> 
> Cheers,
> Magnus
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Re: [time-nuts] Brandywine GPS-4 OCXO

[Bob kb8tq]

Hi

Pictures probably would help :)

Bob

> On May 20, 2017, at 8:00 AM, Magnus Danielson  
> wrote:
> 
> Hi,
> 
> Does someone happen to know what OCXO sits in the Brandywine GPS-4 GPSDO? 
> It's pretty good sized OCXO, possibly double-oven. It has a screw on the side 
> which I presume opens up to the trimmer position.
> 
> If someone could share info it would be useful.
> 
> Cheers,
> Magnus
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Re: [time-nuts] Brandywine GPS-4

[Jason Rabel]

Jeroen,

I have v2.1  v2.2 of the PDF Manual. No real differences that I can see, just 
a couple non-necessary pages.

The only other bit of info I have that might be of some use, I saved the 
startup text a while back, it should look something like
this:

L=load ESC=RUN.
Initialise - Clear RAM 
Initialise DUART 
TFS Ltd C Wed Aug 15 2001 10:18
supp...@timefreq.com
Testing IC19 RAM...PASSED
DEFAULTS-RAM
Testing ROM/FLASH..PASSED  Cksum =  01FA
Testing Indicators
Osc is BRANDYWINE XTAL1...Calibration Found 
Initialise PLL...PLL Initialised Slope Positive
TC1=IRIG   TC2=as TC1 
TimCod msg: $PRCCG,E,1,1,2,3*2D
Offset msg: $PRCCG,O,U,+00:00*62
Alarm Masks
 1234 5678
  0001 
Set Timers
Run GPS4 EGPS17


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Re: [time-nuts] Brandywine GPS-4

[Jeroen Bastemeijer]

Hello Hal,

The serial connection is not the problem (unfortunately). It seems a 
thermal problem When I switch on the unit it takes a couple of 
minutes before the Error-LED starts flashing. Doing a fast power-cycle 
immediately gives an error-warning (the red-LED start flashing almost 
immediately after switch-on). When I let the unit cool down for some 
time (say ten minutes) it takes a couple of minutes before the error-LED 
comes on.


What I will try next is use some cool-spray on the DC-DC converters and 
see if that gives any change in the behaviour.


To my opninion everything inside gets quite warm... Maybe it is a bad 
capacitor (high ESR).


Is there any other good source for technical information on these units 
(schematics, service docs etc.)? Except for the manual wihich is on 
Didiers page?


73 Jeroen PE1RGE

Hal Murray wrote:

The unit used to work so dip-switch, cable etc. are OK. The thing
I  suspect is indeed, some problem with the FLASH and/or EPROM.
However, I  have no useful source of information about that. 



Did it work with the serial port connected to a PC like you are using now?  
Or did you just see the green LED go on?


What happens if you try it without the serial connection?  (There are some 
control signals on that connector that may not match normal RS-232 usage.)


  
begin:vcard
fn:Jeroen Bastemeijer
n:Bastemeijer;Jeroen
org:Delft University of Technology;Electronic Instrumentation Laboratory
adr:GPS: Lat N52.2 Lon E4.37157 Alt. 46.2m;;Mekelweg 4;Delft;;2628CD;Netherlands
email;internet:j.bastemei...@tudelft.nl
title:Ing.
tel;work:+31.15.278.6542
tel;fax:+31.15.278.5755
url:www.tudelft.nl
version:2.1
end:vcard

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Re: [time-nuts] Brandywine GPS-4

[Hal Murray]

 The serial connection is not the problem (unfortunately). It seems a
 thermal problem When I switch on the unit it takes a couple of
 minutes before the Error-LED starts flashing. Doing a fast
 power-cycle  immediately gives an error-warning (the red-LED start
 flashing almost  immediately after switch-on). When I let the unit
 cool down for some  time (say ten minutes) it takes a couple of
 minutes before the error-LED  comes on. 

I don't have any good suggestions.


 To my opninion everything inside gets quite warm... Maybe it is a bad
 capacitor (high ESR).

The crystal is ovenized so I'd expect that area to be warm.

DC-DC bricks get more than warm when running at full power.  But after the 
crystal warms up the load should drop way down.

I took mine apart and was pleased to find a DC-DC brick.  I found the data 
sheet via google.  It says 20 watts and 9-36V (wide range) input.  That was 
nice since I had 24V handy but didn't have 15V.  The data sheet says 81% 
efficiency, slightly lower at low loads.

My unit gets just barely warm as measured by my fingers on the outside of the 
box.  I don't know what it's like inside.

If you don't find anything obviously wrong/hot when poking around, I can take 
the cover off mine and get some reference temperatures.

It might be worthwhile measuring the input voltage/current, both during and 
after the crystal warms up.








-- 
These are my opinions, not necessarily my employer's.  I hate spam.




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Re: [time-nuts] Brandywine GPS-4

[Jason Rabel]

Jeroen,

I have a GPS-4 too and gathered some documentation for it a while back. I'll 
have to dig around on my hard drive but I seem to
recall having at least two versions of the PDF manual. I do not know what the 
difference was between them. Anything I can find I'll
be sure to let you (and the list) know.

You can also try to email Brandywine support, sometimes they reply, sometimes 
they don't.

BTW, has anyone done a comparison between the GPS-4  T-Bolt?

Jason


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Re: [time-nuts] Brandywine GPS-4

[Magnus Danielson]

Jeroen Bastemeijer skrev:

Dear All,

I decided to switch on my Brandywine GPS-4 after some time on the shelf. 
After start-up it takes some time, then the Alarm-LED starts flashing...
When I look at the data coming from the serial port it keeps saying 
L=load ESC=run. Unfortunately the unit doesn't respond to any command :-(


A few comments from my own flimsy attempts...

Using a straight 9 pin cable to the PC does not work well. The serial 
port needs to the cut out so the other signals does not confuse things.


Also, check the serial configuration details. The manual gives details 
on how the DIP switch should be set.


The GPS4 has a FLASH and a EPROM image, so you could have entered the 
backup EPROM image flash download mode.


You just reminded me that I need to make some more serious attempts to 
get it up and running with serial interface too. It locks up without 
serial cable, so it is only me messing with it.


The GPS4 can be modified to be used for external clock steering of OCXO 
and Rubidium sources, just as the Thunderbolt can.


Cheers,
Magnus

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Re: [time-nuts] Brandywine GPS-4

[Jeroen Bastemeijer]

Dear Magnus,

Thank you for your response!

The unit used to work so dip-switch, cable etc. are OK. The thing I 
suspect is indeed, some problem with the FLASH and/or EPROM. However, I 
have no useful source of information about that.


The initial question: L=load ESC=run has something to do with FLASH 
restore, I think. However, the unit doesn't seem to repond to the 
commands sent through the serial port. Do you know of any jumper inside 
which could be used to force a new load of the flash? When I open up the 
unit I see a number of jumpers inside, but I don't have a useful 
description of their function.


73 Jeroen PE1RGE

Magnus Danielson wrote:

Jeroen Bastemeijer skrev:

Dear All,

I decided to switch on my Brandywine GPS-4 after some time on the 
shelf. After start-up it takes some time, then the Alarm-LED starts 
flashing...
When I look at the data coming from the serial port it keeps saying 
L=load ESC=run. Unfortunately the unit doesn't respond to any 
command :-(


A few comments from my own flimsy attempts...

Using a straight 9 pin cable to the PC does not work well. The serial 
port needs to the cut out so the other signals does not confuse things.


Also, check the serial configuration details. The manual gives details 
on how the DIP switch should be set.


The GPS4 has a FLASH and a EPROM image, so you could have entered the 
backup EPROM image flash download mode.


You just reminded me that I need to make some more serious attempts to 
get it up and running with serial interface too. It locks up without 
serial cable, so it is only me messing with it.


The GPS4 can be modified to be used for external clock steering of 
OCXO and Rubidium sources, just as the Thunderbolt can.


Cheers,
Magnus
begin:vcard
fn:Jeroen Bastemeijer
n:Bastemeijer;Jeroen
org:Delft University of Technology;Electronic Instrumentation Laboratory
adr:GPS: Lat N52.2 Lon E4.37157 Alt. 46.2m;;Mekelweg 4;Delft;;2628CD;Netherlands
email;internet:j.bastemei...@tudelft.nl
title:Ing.
tel;work:+31.15.278.6542
tel;fax:+31.15.278.5755
url:www.tudelft.nl
version:2.1
end:vcard

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Re: [time-nuts] Brandywine GPS-4

[Hal Murray]

 The unit used to work so dip-switch, cable etc. are OK. The thing
 I  suspect is indeed, some problem with the FLASH and/or EPROM.
 However, I  have no useful source of information about that. 

Did it work with the serial port connected to a PC like you are using now?  
Or did you just see the green LED go on?

What happens if you try it without the serial connection?  (There are some 
control signals on that connector that may not match normal RS-232 usage.)

-- 
These are my opinions, not necessarily my employer's.  I hate spam.




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Re: [time-nuts] Brandywine GPS-4 (0010-0040) manual

[ji1qgk]

Hi Didier and Jason

Thanks for uploading the manual.
However, your page is not found now. Could you confirm it?
My unit GPS locked and true 10MHz output but dose not responded TD1/RX1 
line.

TNX
73's
JI1QGK
Hiro

- Original Message - 
From: Didier Juges [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement 
time-nuts@febo.com
Sent: Sunday, April 22, 2007 10:54 AM
Subject: Re: [time-nuts] Brandywine GPS-4 (0010-0040) manual


 check
 http://www.ko4bb.com/ham_radio/Manuals/4_GPS_Stuff/GPS4-Manual_v2.2-1.pdf

 Didier KO4BB


 Hi.

 I'm looking for manual of Brandywine GPS-4 (model:0010-0040).
 Does anyone know where to obtain it?

 Thanks
 Hiro




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Re: [time-nuts] Brandywine GPS-4 (0010-0040) manual

[Didier Juges]

Oooops:

http://www.ko4bb.com/ham_radio/Manuals/4_GPS_Stuff/GPS4-Manual_v2.2.pdf

Sorry for the typo...

Didier KO4BB

ji1qgk wrote:
 Hi Didier and Jason

 Thanks for uploading the manual.
 However, your page is not found now. Could you confirm it?
 My unit GPS locked and true 10MHz output but dose not responded TD1/RX1 
 line.

 TNX
 73's
 JI1QGK
 Hiro
   


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Re: [time-nuts] Brandywine GPS-4 (0010-0040) manual

[Didier Juges]

check 
http://www.ko4bb.com/ham_radio/Manuals/4_GPS_Stuff/GPS4-Manual_v2.2-1.pdf

Didier KO4BB

   
 Hi.

 I'm looking for manual of Brandywine GPS-4 (model:0010-0040).
 Does anyone know where to obtain it?

 Thanks
 Hiro
 

   

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Re: [time-nuts] Brandywine GPS-4 User Manual

[Didier Juges]

Thanks to Bob, the Brandywine GPS-4 manual is at 
http://www.ko4bb.com/ham_radio/Manuals/2_GPS_Stuff

Didier KO4BB


 Original Message 
Subject:RE: [time-nuts] Looking For Brandywine GPS-4 User Manual
Date:   Thu, 21 Dec 2006 10:21:42 -0500
From:   Robert E. Martinson [EMAIL PROTECTED]
To: 'Didier Juges' [EMAIL PROTECTED]



Done (I think).  Never uploaded to an FTP site b4.

If you don't see GPS4-Manual v2.2.pdf. Please tell me how to upload.

REM



-Original Message-
From: Didier Juges [mailto:[EMAIL PROTECTED] 
Sent: Thursday, December 21, 2006 8:35 AM
To: Robert E. Martinson
Subject: Re: [time-nuts] Looking For Brandywine GPS-4 User Manual


Bob,

If you would like, you can upload the manual to my web site and I'll 
move it with the other manuals at http://www.ko4bb.com/ham_radio/Manuals

to do that, point your ftp client to
ftp.ko4bb.com
login: manuals
password: manuals

and send me an email when you are done, so I can move it.

Thanks in advance

Didier KO4BB



Rob Kimberley wrote:
 Hi Bob,

 Any chance you could email me a copy also?

 Cheers

 Rob Kimberley 

 -Original Message-
 From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
 Behalf Of Robert E. Martinson
 Sent: 21 December 2006 05:53
 To: 'Discussion of precise time and frequency measurement'
 Subject: Re: [time-nuts] Looking For Brandywine GPS-4 User Manual

 Hi,
 Tried sending it via this list, but there is a 128KB limit.  Please send
me
 your direct email address.

 73,
 Bob N1VQR



 -Original Message-
 From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
 Behalf Of Jason Rabel
 Sent: Wednesday, December 20, 2006 8:45 PM
 To: 'Discussion of precise time and frequency measurement'
 Subject: [time-nuts] Looking For Brandywine GPS-4 User Manual


 Does anyone by chance have a PDF manual for a Brandywine GPS-4 (not the
PDF
 spec sheet on their site)? Also, if it's not mentioned in the manual, what
 is the power input for the unit?

 I've tried contacting the Brandywine people a couple times, have not
 received a reply. :(

 Thanks,
 Jason


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