From: Dr Bruce Griffiths [EMAIL PROTECTED]
Subject: Re: [time-nuts] Motorola Oncore GPS Interface Board
Date: Tue, 28 Nov 2006 14:36:19 +1300
Message-ID: [EMAIL PROTECTED]
Hal Murray wrote:
Driving a full 5V TTL signal into a 50 ohm load is another matter -
you need a lot of DC power (1/2
I may have asked this before, but do you happen to have a few references on
the extensions to Leeson's theory?
Cheers,
Magnus
References are:
/A General Theory of Phase Noise/ /in Electrical Oscillators/
Ali Hajimiri, Student Member, IEEE, and Thomas H. Lee, Member, IEEE
IEEE JOURNAL OF
Driving a full 5V TTL signal into a 50 ohm load is another matter -
you need a lot of DC power (1/2 watt) to do that. I was just using a
Liner Tech LT1010 for a similar job - it would get the job done, but
folks here might complain about the phase noise.
Where does that phase noise come
David Forbes wrote:
Jason Rabel wrote:
A good initial buffer chip for all the TTL signals would be an IDT QS3384
with 10 inputs/outputs.
Jason,
The only problem with that part is that it's not a buffer! It's a
switch. It has no drive capability at all.
There are useful buffer
David Forbes wrote:
Jason Rabel wrote:
A good initial buffer chip for all the TTL signals would be an IDT QS3384
with 10 inputs/outputs.
Jason,
The only problem with that part is that it's not a buffer! It's a
switch. It has no drive capability at all.
There are useful buffer
Hal Murray wrote:
Driving a full 5V TTL signal into a 50 ohm load is another matter -
you need a lot of DC power (1/2 watt) to do that. I was just using a
Liner Tech LT1010 for a similar job - it would get the job done, but
folks here might complain about the phase noise.
Where does
David Forbes wrote:
Jason Rabel wrote:
A good initial buffer chip for all the TTL signals would be an IDT QS3384
with 10 inputs/outputs.
Jason,
The only problem with that part is that it's not a buffer! It's a
switch. It has no drive capability at all.
There are useful buffer
Jason,
The only problem with that part is that it's not a buffer! It's a
switch. It has no drive capability at all.
There are useful buffer chips for this task, but their names escape me
just now. Perhaps the 74FCT245 or equivalent would work.
Driving a full 5V TTL signal into a 50
Jason Rabel wrote:
Jason,
The only problem with that part is that it's not a buffer! It's a
switch. It has no drive capability at all.
There are useful buffer chips for this task, but their names escape me
just now. Perhaps the 74FCT245 or equivalent would work.
Driving a full 5V TTL
PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Jason Rabel
Sent: Thursday, November 23, 2006 3:38 PM
To: time-nuts@febo.com
Subject: [time-nuts] Motorola Oncore GPS Interface Board?
I have a couple of the Motorola Oncore UT+ boards, right now I just
cobbled an interface to my zodiac dev kit
Jason,
Mouser p/n# 575-003201 has just enough length of leads to bend straight and
solder into wire wrap headers.
Though tedious, wire wrap makes prototyping fairly easy as well as
inexpensive.
Good luck,
Norm n3ykf
___
time-nuts mailing list
I have built 3 prototype boards for interfacing to a Motorola GT/UT GPS and I am
about ready to order production boards. I was wondering how many users are
looking for something like this, TAPR and another source have discontinued their
products.
Presently the design has a linear voltage regulator
Hi Bob,
Can you give some more specifics? Do you have a PDF schematic? What would
the cost be?
My main thing for the design I'm looking for is:
1. The same size as the UT board so they can be connected together (like the
TAPR model)
2. Multiple buffered PPS outputs (TTL RS232 levels) and
I would be interested in one if the cost is reasonable.
Daun
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf
Of [EMAIL PROTECTED]
Sent: Friday, November 24, 2006 10:25 PM
To: time-nuts@febo.com
Subject: [time-nuts] Motorola Oncore GPS Interface Board
I
I have a couple of the Motorola Oncore UT+ boards, right now I just cobbled
an interface to my zodiac dev kit to use one, but I was looking for a more
permanent interface board. Something similar to the one TAPR used to supply:
http://www.tapr.org/gps_vpib.html
Is there anyone out there that
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