[time-nuts] Question about FTS 1050A

Robert Darby bobdarby at triad.rr.com
Wed Apr 3 23:15:06 EDT 2013


Dick,

If you're asking about the FTS 1050A it was on Ebay.  I believe 
Symmetricom still sells them but I can't justify buying one from them.

bob

On 4/3/2013 10:56 PM, Richard Solomon wrote:
> Just curious, where are you getting these from ?
>
> Tnx, Dick, W1KSZ
>
>
> On 4/3/2013 7:21 PM, Robert Darby wrote:
>> A little follow-up.
>>
>> I looked at all four 1000B outputs with the scope; one pair is at 
>> 1.2V rms and the second is at .7V rms.  The waveform looks clean and 
>> is close to the 1.0V and .5V described on the spec sheet so I 
>> conclude that the oscillator is fine.
>>
>> I disassembled the doubler case to check the voltage there and found 
>> that the voltage regulator is working correctly. There are two 
>> identical boards inside. The oscillator feeds a Mini-Circuits AK-2(+) 
>> frequency multiplier directly and each doubled output is fed into two 
>> identical circuits each with with 4 2n2222's, two diodes, assorted 
>> resistors and caps thence out through a Mini-Circuits wideband 
>> transformer TMO4-6.  With the boards on the bench I jury rigged an 
>> oscillator to drive the input and I get the same low output, albeit 
>> rather cleaner.  I'm going to order some connectors so I can be 
>> certain about the signal path and check the doublers again.
>>
>>  I wonder if someone needed four low level 10MHz outputs and 
>> ordered/modified the amplifiers to suit.  I'm not sure they're 
>> working perfectly but I suspect most of the noise I'm seeing is due 
>> to my hook-up to the tnc connectors.  I'll know more once I get some 
>> connectors and meanwhile I'll attempt to draw a schematic of the 
>> circuit.
>>
>> Thanks for everyone's comments; more later.
>>
>> Bob Darby



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