When I was working on military electronics in the 60s,
crystals in ovens often had octal sockets.
Inside the package there was a mechanical thermal switch
on an aluminium casing around the crystal with a heater
wrapped around it.
Two pins will be the crystal, there may be more than one shield,
two
Well, I plugged my Oncore UT+ into my PC and it didn't work until I
put a level shifter in... no damage but no data either. So far I've
been lucky in that every device I tried that needed a level shifter
wasn't damaged by the lack of one.
The normal MAX232 type level shifters include an
Hal Murray wrote:
Well, I plugged my Oncore UT+ into my PC and it didn't work until I
put a level shifter in... no damage but no data either. So far I've
been lucky in that every device I tried that needed a level shifter
wasn't damaged by the lack of one.
The normal MAX232 type level
Quoth Hal Murray at 2008-03-07 19:59...
The normal MAX232 type level shifters include an inverter.
So even if the voltage levels work without a level shifter, the signal will
be upside down.
I'm building my test board with a hex inverter that I'm actually using
to buffer the 1PPS signal.
My search on Google did not turn up much, some pictures of james knights but
not the one you have and a note that at least one octal oven had the crystal on
pins 4 and 6.
http://www.leedsradio.com/images-odds/JamesKnights_JK013S25.JPG
http://www.leedsradio.com/images-odds/JamesKnights_JK02.JPG
NIST 'Quantum Logic Clock' Rivals Mercury Ion as World's Most Accurate Clock
http://www.physorg.com/news124035207.html
-ch
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Those interested in the subject satellite should check the below page...
http://groups.google.com/group/alt.satellite.gps/browse_thread/thread/d9ecefc77d23328e/fe7f019259416b60
Bruce
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From: [EMAIL PROTECTED] (Mike S)
Subject: Re: [time-nuts] SVN-32
Date: Fri, 07 Mar 2008 18:17:03 -0500
Message-ID: [EMAIL PROTECTED]
At 05:04 PM 3/7/2008, Bruce Lanning wrote...
Those interested in the subject satellite should check the below
page...
The inverter is required because the Motorola GPS receiver uses TTL and
the PC serial port uses RS232.
RS232 uses a positive voltage of +3 to +25 volts to indicate a logic
zero, and a negative voltage of -3 to -25 volts to indicate a logic one.
Brian KD4FM
Bruce Griffiths wrote:
Hal Murray
Attached is a interface for an Oncore VP receiver. You will have to
check - I believe the GT and UT use the same connections as the VP.
Brian Kirby wrote:
The inverter is required because the Motorola GPS receiver uses TTL and
the PC serial port uses RS232.
RS232 uses a positive voltage of
Quoth Brian Kirby at 2008-03-08 14:46...
Attached is a interface for an Oncore VP receiver. You will have to
check - I believe the GT and UT use the same connections as the VP.
Thanks Brian - that's pretty close to what I've come up with apart from
the fact that I'm putting isolation (TI
For isolation of digital signals such as RS-232 (before level translation),
it's hard to find something more amazing than the Analog Device ADuM5241
http://www.analog.com/en/prod/0,2877,ADUM5241,00.html
It's an SO-8 device, with two digital channels, isolated to 2500V (!) and a
built-in power
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