[time-nuts] Lucent KS-24361 10 Mhz out success.

Bob Camp kb8tq at n1k.org
Wed Dec 3 21:07:18 EST 2014


So how does the 5 MHz get into the FPGA and / or  CPU? 

In order to discipline the OCXO and to generate the PPS, there must be a path. If that path is independent of the 15 MHz (or 15 and 10) multiplier(s) then you have a lot of things you can do. If either of the existing multipliers need to be kept running, that limits you a bit. 


> On Dec 3, 2014, at 8:40 PM, paul swed <paulswedb at gmail.com> wrote:
> On the output of the crystal oscillator you will want to buffer it and then
> do whatever you like. Its a sine wave and as I recall of fair level several
> volts. I did see a bit of distortion on the sine wave. It can be obtained
> at J8 the unpopulated jack.
> Now back to putting it in its case.
> Regards
> Paul
> On Wed, Dec 3, 2014 at 7:33 PM, Gerhard Hoffmann <dk4xp at arcor.de> wrote:
>> Am 04.12.2014 um 00:04 schrieb paul swed:
>>> Have successfully tapped into the clean 10 MHz of the the Lucent and using
>>> a EL2020 50 Mhz current opamp have a very nice 10 Mhz sine wave out. Any
>>> spurs are down at least 43 db. Close in at 4Khz total span or 500 Hz/div I
>>> don't see anything down to at least 65 db. Thats the best detail the HP
>>> 8568B will allow.
>> Congrats!
>> Can't help to ask some questions:
>> The MTI-260, is that a CMOS level or a sine output version on 5 MHz?
>> Where I'm right now, I have the Lucent pair, one of them dismantled,
>> but no power supply & no scope, that has to wait until the weekend.
>> I'd like to make a small board that directly takes the 5 MHz from the
>> Osc, buffers it, doubles it with the NIST FET doubler and provides 4 SMA
>> +12dBm outputs at 10 MHz via 4*AD8009 or LMH6702.
>> There is enough free space on the front plate.
>> I'd like to hear that the osc delivers a sine, since that makes
>> doubling easier.
>> BTW I have another 10 MHz MTI-260 and did measure phase noise with
>> an E5052B. That was not so funny. Probably it's orientiented towards
>> long term stability at the cost of noise with absolutely minimum crystal
>> dissipation. I'd like to repeat the measurement under better controlled
>> environmental conditions b4 I tell numbers.
>> But it seems that Morion rulez, noise-wise.
>> regards, Gerhard
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