[time-nuts] Lucent KS-24361 15 Mhz and 10 Mhz

Bob Camp kb8tq at n1k.org
Mon Dec 1 18:37:10 EST 2014


Hi

Yes, one of the “great unanswered questions” about the KS boxes is how to quickly and easily switch them from a nice clean (useless) 15 MHz output to a nice clean (useful) 10 MHz. The circuit appears to be all discrete analog. That suggests that a “jumper this, swap that” approach might work. 

Bob

> On Dec 1, 2014, at 10:11 AM, paul swed <paulswedb at gmail.com> wrote:
> 
> ​To address the one question Ref1s have no 10 Mhz. Just 15 MHz.
> I have reversed out the various paths but it seems so have others. Must
> have missed that thread. I do see the 5 to 10 doubler is in the q200-q203
> region. I can't speak to the qualities of the signals and still have not
> found the magical X+Y= 15 Mhz.
> So what are folks doing that just have ref 1s?
> Is this the discussion on buffering the 5 Mhz and doubling?
> Regards
> Paul​
> 
> On Mon, Dec 1, 2014 at 7:43 AM, Bob Camp <kb8tq at n1k.org> wrote:
> 
>> Hi
>> 
>> Given the level of phase noise on the Ref-0 10 MHz output, I would not
>> *want* to use the same pin they get that off of ….
>> 
>> Bob
>> 
>>> On Dec 1, 2014, at 6:25 AM, Götz Romahn <goetz at g-romahn.de> wrote:
>>> 
>>> @ Paul
>>> yes pin 1 of U206 is the input of a schmitt-trigger ( xxACT14 ) where
>> the rectangular 10 MHz output on the Ref-0 Modul is generated.
>>> 
>>> @ David
>>> 10 MHz is not available on the Ref-1 module, the one with antenna input
>> (yea, but it is still at pin 1 of U206).
>>> 
>>> Götz
>>> 
>>> Am 01.12.2014 04:09, :
>>>> OK so it was not as hard as I thought getting all of teh screws out. The
>>>> harder part is getting the actual board to slip out of the back.
>>>> After getting to the bottom I found a locked 10 Mhz signal on U206 pin 1
>>>> somewhat of a sine wave but compressed top and bottom at 5 V and pin 2 a
>>>> squared up version. Pin 1 goes off to several transistors. Also I have
>> not
>>>> looked at the rest of u206.
>>>> So good or bad a tracking 10 Mhz exists. Not so easy to get to frankly.
>>>> Regards
>>>> Paul
>>>> WB8TSL
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