Hi, I've been reading this group for some time now and have recently
purchased an Efratom FRK-H unit. Now I need to make it work! I have
powered it up and after warmup it draws [EMAIL PROTECTED] I have a 10MHz
output sinewave and a lamp voltage of 8.14V. The xtal ctrl voltage is
12.2V and
Hi all
Recently i find a Redifon GK203N Drive Unit in a naval scrapyard .Does anybody
have the service manual to send me a copy in pdf? Vangelis
_
Invite your mail contacts to join your friends list with Windows Live Spaces.
It's
I am looking for connector info (pin assignment and mating connector ID)
for a Trimble Thunderbolt receiver module. This is the OEM module
(probably telcom original customer) with just the receiver board contained
in the enclosure( no 24 volt DC-to-DC converter). Presumably the small
six (6) pin
It took longer than I anticipated, but I have the starting point of an
adequate data logger.
For now, I simply recorded the HP10811 heater current versus ambient
temperature in my shack over night.
It was a little more involved than I anticipated because the temperature
variations right now are
I am looking for connector info (pin assignment and mating connector ID)
for a Trimble Thunderbolt receiver module. This is the OEM module
Jeff,
The connector is documented in the manual which Trimble
has on their web site:
Tim,
It sound like your unit is locked.
Power it off for 15 minutes and then monitor the Xtal control when
powering back up.
It should sweep from about 2 volts to 15 volts.
Within 10 minutes it should stop sweeping indicating a lock.
After being locked for a few hours adjust the Xtal trim cap
In a message dated 22/11/2007 13:57:48 GMT Standard Time, [EMAIL PROTECTED]
writes:
Hi all
Recently i find a Redifon GK203N Drive Unit in a naval scrapyard .Does
anybody have the service manual to send me a copy in pdf? Vangelis
Hi Vangelis
I've just arrived home and seen your
If you don't get an answer I'll check mine on Friday. (Thanksgiving and all)
Mine came from a E911 box.
It did take a + and - voltage but don't remember off the top of my head.
73
Chris
**Check out AOL's list of 2007's hottest
products.
Corby gave you good information. Probably you need to monitor the
resistance to ground on the lock signal for low (mine was about 140
ohms) when locked. In the manual referenced below, it looks like the
lock output is pulled up to +17V so you *would* see a voltage change if
yours had that
Didier Juges wrote:
It took longer than I anticipated, but I have the starting point of an
adequate data logger.
For now, I simply recorded the HP10811 heater current versus ambient
temperature in my shack over night.
It was a little more involved than I anticipated because the temperature
Thanks for answering Nigel
yes my hotmail can take this size of attachment. Have a nice rest .Vangelis
SV1ALX
From: [EMAIL PROTECTED]
Date: Thu, 22 Nov 2007 14:32:36 -0500
To: time-nuts@febo.com
Subject: Re: [time-nuts] Redifon gk203n Drive unit
In a message dated 22/11/2007 13:57:48
Hello CH,
What are the meaning and units of the various fields reported by
servo:trace?
Our proprietary Fury GPSDO trace string is enabled with the command:
serv:trace 1
The resulting string has the following meaning:
00:03:21 07-08-25 17717 21038 -3.02 -3.45E-13 56.9 0.120146 9 9
Bruce,
I have some 4 terminal current sense resistors at work, but they are very
low values (0.1 ohm and lower), so what I may gain at the sensor I may loose
in the amplifier. Right now, the 1 ohm resistor and OP-27 give a voltage
that is way out of the noise, as the curve shows. If I can find
Didier Juges wrote:
Bruce,
I have some 4 terminal current sense resistors at work, but they are very
low values (0.1 ohm and lower), so what I may gain at the sensor I may loose
in the amplifier. Right now, the 1 ohm resistor and OP-27 give a voltage
that is way out of the noise, as the
Hi,
the current temperature relationship should be nearly linear,
so if 100mA is needed at 20 C ambient and it follows that at 80 C
no heating is required, then the heating current will decrease at
about 1.7mA/K.
cheers, Neville Michie
On 23/11/2007, at 9:33 AM, Didier Juges wrote:
Bruce,
Hi Tim (swingbyte)
The continuous sends continue even with computer off and ADSL unplugged.
I've mailed ISP to see if they can sort it out.
I'm getting continuous mail delivery failed: returning message to sender
Sorry about all this.
Phil
___
Thanks for the help - the manual is great.
I have trimmed the xtal so the control voltage is around 8.5V. The lock
output is working - drops from 1.5V to 0.03 volts when locked.
I only have an old HP5340A with OCXO option as my frequency meter. It
reads 10.00MHz as the output from the
Thanks Tom ( and to Cris N3IZN for offer to research). This is the info I
needed;
does anyone know of a good source (small quantity sales) for the SAMTEC
connector specified?
Many thanks for getting me started down the right road.
Jeff Walaker W3JW
They are standard Molex SL connectors;
Phil Staton wrote:
Hi Tim (swingbyte)
The continuous sends continue even with computer off and ADSL unplugged.
I've mailed ISP to see if they can sort it out.
I'm getting continuous mail delivery failed: returning message to sender
Sorry about all this.
Phil
OOPS, it's a GMCT 20,(M not N).
REM
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Robert E. Martinson
Sent: Friday, November 23, 2007 1:11 AM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Where to get
HI Tim,
I have 2 FRK's here both use a connector made by Positronic, it's a GNCT 20.
See http://www.connectpositronic.com/downloads/pdf/C009RevC_StdDenRec.pdf
The Positromic site says (for Australia):
Australia (Commercial Industrial selected Military Accounts)
Walcom Pty. Ltd
118 Pryor Road
Hi all,
Now that I have my FRK working I have to find a connection for it. I
believe it is a winchester 20p and I have not been able to find one in
Australia yet. Is it worth while looking or should I just replace it
with something else or even solder leads to it!
As an aside, what resolution
I only have an old HP5340A with OCXO option as my frequency meter.
How good do you think the calibration on the OCXO is?
I have a GPS receiver I have to get going that has a 1PPS output on
it. What would be an appropriate way to use this to calibrate the
FRK - in my lifetime:)
The PPS
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