[time-nuts] LTE-Lite Plans
saidjack at aol.com
Wed Nov 26 12:38:42 EST 2014
A double tragedy. I was working with Jim Williams on one of our designs a week before he passed away. Then Bob crashed his car coming from Jim's funeral (grief?) and died too.
Two of the greatest analog minds lost within days.
Sent From iPhone
> On Nov 26, 2014, at 9:34, Jim Sanford <wb4gcs at wb4gcs.org> wrote:
> Interesting comment. . . . I'm reading Bob's book now!
> Never met him, but felt like I knew him from all of his writings.
> His death was very sad....
> wb4gcs at amsat.org
>> On 11/26/2014 12:20 PM, Didier Juges wrote:
>> Your drawing looks better than those byBob Pease, and he was never
>> embarrassed by his :)
>> Thank you for your extensive contributions to time nuts
>> Didier KO4BB
>> On Tue, Nov 25, 2014 at 7:28 PM, S. Jackson via time-nuts <
>> time-nuts at febo.com> wrote:
>>> I never expected such an intense discussion about using and buffering the
>>> outputs from the LTE-Lite board since the actual circuit to use can be
>>> quite simple.
>>> To address these questions, I drew up a simple schematic that uses a DIP-14
>>> 74AC04 gate, six resistors, and two caps. Everyone who can solder should
>>> be able to build this simple circuit as a dead-bug type build on a
>>> copper-clad board.
>>> This circuit will buffer all three outputs (1PPS, TCXO RF, and Synthesixed
>>> RF) of the LTE-Lite eval board with CMOS 3.0V levels that can drive 50 Ohms
>>> terminations. For simplicity I grab the 3.0V power from the DIP-14 TCXO on
>>> pin 14 of that part on the eval board, even though I would strongly
>>> suggest to use a separate low noise 3.3V or 5V power supply to power the
>>> You can add 100nF caps in series to the two RF signals before they feed
>>> into the coax output connectors for less power consumption and removing DC
>>> instruments that don't like DC inputs.
>>> Using a single IC for the three signals will result in crosstalk between
>>> the signals, but it should be clear from the schematics how one could break
>>> up the signals by using three independent ICs to minimize crosstalk.
>>> We use this circuit in a small box here using SMT components, and it works
>>> really well.
>>> Excuse my horrible writing, using keyboards has made my fingers numb..
>>> Hope that helps,
>>> time-nuts mailing list -- time-nuts at febo.com
>>> To unsubscribe, go to
>>> and follow the instructions there.
>> time-nuts mailing list -- time-nuts at febo.com
>> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
> This email has been checked for viruses by Avast antivirus software.
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
More information about the time-nuts