[time-nuts] LTE-Lite module
SAIDJACK at aol.com
SAIDJACK at aol.com
Sun Oct 19 01:44:45 UTC 2014
Thanks for helping out Bob,
sometimes I get ahead of myself.
Dave, you can also trace the wiring on the photo I had sent of the actual
module, its more or less clearly visible under the lupe. Please note that
on that module I mounted the IC upside down, with the pins sticking up, and
bending the grounded pins down toward the PCB.
In a message dated 10/18/2014 17:55:36 Pacific Daylight Time, kb8tq at n1k.org
The 20 MHz connects only to pin 3.
+3V connects to pin 4 , but not pins 2 or 3.
Pin 6 hooks only to pin 2 and nothing else.
> On Oct 18, 2014, at 8:23 PM, Dr. David Kirkby (Kirkby Microwave Ltd)
<drkirkby at kirkbymicrowave.co.uk> wrote:
> I am sorry, but I can't follow the circuit diagram. It is not clear to
> what pins are joined, and what are not. Sometimes you have used a filled
> circle to indicate lines are joined, and in another case there's a
> semicircle to indicate that they are not. But on some of the others, I
> don't know what are supposed to be joined and what are not.
> On 19 Oct 2014 01:00, "S. Jackson via time-nuts" <time-nuts at febo.com>
>> 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
>> 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
>> This design can work up to 145MHz according to the 74LVX74 datasheet if
>> powered at 3.3V.
>> In a message dated 10/18/2014 14:09:54 Pacific Daylight Time,
>> kc0wjn at gmail.com 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.
>> 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,
>>> thanks for answering some of these already!
>>> Dave, as Bob said "it depends on your application" -- and your time
>>> Also, please check the FAQ for an answer on the external TCXO
>>> 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
>>> 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
>>> 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
>>> as clean as it is I guess the TimePod software could only find two
>>> 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
>>> I hope that answers all questions,
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