[time-nuts] KS-24361 10 Mhz mod interesting document -> older KS boxes

Bob Camp kb8tq at n1k.org
Thu Nov 20 18:09:03 EST 2014


Hi

So far, I have yet to have one of the Rb’s die (of the ones that worked when new to me). The magic “lamp voltage” on the Efratom versions clusters in two groups. That seems to be related to some sort of production change rather than better performance on the (slightly) newer parts. 

Bob

> On Nov 20, 2014, at 9:17 AM, paul swed <paulswedb at gmail.com> wrote:
> 
> On the old telco RBs $25 they all worked, but were down on lamp life. So
> the first one chosen ran for 3 years and then started blinking out.
> Replaced it with another. That first one is the one I used the heat gun on
> and is again operable with what appears could be good lamp life.
> (Reasonable)
> Regards
> Paul
> WB8TSL
> 
> On Thu, Nov 20, 2014 at 7:00 AM, Bob Camp <kb8tq at n1k.org> wrote:
> 
>> Hi
>> 
>> So far, I have not found any of the Rb’s that came out of the KS boxes
>> with troubles. The ones I got and pulled from boxes myself all have worked
>> fine. The units that got pulled on the other side of an ocean, not so much.
>> There have been a couple of them with issues. What ever they go through
>> getting shipped overseas and salvaged, it’s not doing the parts any good.
>> That’s one of the reasons getting the newer design KS boxes NIB has a lot
>> of appeal. There are infant mortality reliability issues to deal with on
>> new stuff. I’d rather have those issues than end of life and corrosion.
>> 
>> Bob
>> 
>> 
>>> On Nov 19, 2014, at 9:05 PM, paul swed <paulswedb at gmail.com> wrote:
>>> 
>>> And I am the happy owner of 4 or 5 of the $25 RBs. Hey they are old but
>> you
>>> can recover them with the old heatgun trick. That said glowing things
>> like
>>> those do tend to wear out. I could see why they moved away from them.
>>> 
>>> On Wed, Nov 19, 2014 at 8:15 PM, Bob Camp <kb8tq at n1k.org> wrote:
>>> 
>>>> Hi
>>>> 
>>>> Lucent has been putting GPS based Radio Frequency Timing Generators
>> (RFTG)
>>>> into cell sites for a long time. They all have the 15 MHz and pps
>> outputs
>>>> in common. Lucent also seems to like one paint color and an approximate
>>>> size. For what ever reason (because they can?) the model numbers and
>>>> internal designs change from time to time. For quite a while they really
>>>> liked the idea of running Rb’s in cell sites. Looking at the latest
>> batch
>>>> of parts, that seems to have changed around 1999.
>>>> 
>>>> Lots of generations of very similar looking boxes with very different
>>>> stuff inside each of them.
>>>> 
>>>> Bob
>>>> 
>>>>> On Nov 19, 2014, at 7:53 PM, paul swed <paulswedb at gmail.com> wrote:
>>>>> 
>>>>> I just saw the picture of the units front panel and it looked the same.
>>>>> Oh well.
>>>>> Regards
>>>>> Paul
>>>>> WB8TSL
>>>>> 
>>>>> On Wed, Nov 19, 2014 at 7:08 PM, Bob Camp <kb8tq at n1k.org> wrote:
>>>>> 
>>>>>> Hi
>>>>>> 
>>>>>> This is a branch thread that never got it’s title changed to drop the
>>>>>> KS-24361 part of it. More or less it’s “compare the older KS boxes to
>>>> the
>>>>>> newer ones”.
>>>>>> 
>>>>>> Bob
>>>>>> 
>>>>>>> On Nov 19, 2014, at 6:03 PM, Dan Rae <danrae at verizon.net> wrote:
>>>>>>> 
>>>>>>> On 11/19/2014 2:47 PM, paul swed wrote:
>>>>>>>> Was doing a search for Lucent RFTGm-II-XO looking for alternates to
>>>> the
>>>>>>>> $150 solution.
>>>>>>>> A 10 Mhz mod popped up.
>>>>>>>> 
>>>>>>>> http://telcodata.us/~myself/Lucent-RFTGm-Modification.pdf
>>>>>>>> 
>>>>>>>> Looks simple enough and I have not validated anything.
>>>>>>>> Regards
>>>>>>>> Paul
>>>>>>>> WB8TSL
>>>>>>>> 
>>>>>>> Paul, that has nothing to do with the current ebay offerings that
>> have
>>>>>> generated so much traffic recently...
>>>>>>> 
>>>>>>> Dan
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