This looks pretty interesting:
74G series PO74G74
http://www.ebay.com/itm/330551715157?_trksid=p2060778.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT#ht_411wt_664
600+ MHz cmos 3.5 volt
Tom
----- Original Message -----
From: "S. Jackson via time-nuts" <[email protected]>
To: <[email protected]>; <[email protected]>
Sent: Saturday, October 18, 2014 5:40 PM
Subject: Re: [time-nuts] LTE-Lite module
Dave, et.al.,
upon popular request I put together a PDF of my email describing how I
generated a low-phase-noise 10MHz output from the CMOS 20MHz output of the
LTE-Lite GPSDO. Here it is.
No guarantees whatsoever guys, and it does take good equipment, a very
steady hand, and a lot of experience to put this together and make it work
properly.
This design can work up to 145MHz according to the 74LVX74 datasheet if
powered at 3.3V.
bye,
Said
In a message dated 10/18/2014 14:09:54 Pacific Daylight Time,
[email protected] writes:
Hi, Said.
I would be interested in having a copy of your "app-note", if that is
possible. I'd like to purchase one of the GPSDOs, but will need to wait
for amonth or so.
Thanks.
Cheers,
DaveD
On 10/18/2014 12:19 PM, S. Jackson via time-nuts wrote:
Hi guys,
lots of questions, let me try to answer some of these. Bob, David, et.
al,
thanks for answering some of these already!
Dave, as Bob said "it depends on your application" -- and your time
frame.
Also, please check the FAQ for an answer on the external TCXO
requirement,
specifically item 35. in the FAQ on the Ebay website for the product.
Jim, I ended up doing the "appnote" in email format, and sending out a
description, schematics, PN plot, and photos yesterday, please check
your
emails. I won't do a formal appnote, sorry no time.. I hope the
description of
what I wired-up yesterday is good enough for folks to try the same.
Ernie, as mentioned here the price is $185 plus shipping on Ebay for the
entire kit. Shipping is calculated by Ebay, and should be a flat-rate
of $10
in the continental US
Hal, MY BAD!! I should have known better and super-imposed both the
original 20MHz and 10MHz plots on the same plot. I will do so shortly.
On the
table in the plot: the TimePod tries to determine spurs, and display
them on
the upper right hand of the plot in a table, and with the phase noise
being
as clean as it is I guess the TimePod software could only find two
spurs,
one at 0.8 and one at 0.9Hz offset from carrier, which was not even
shown in
that plot since it starts at 1Hz.
Thanks so much for your feedback, lively discussion, and good questions
guys.
I hope that answers all questions,
bye,
Said
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