[time-nuts] Question about FTS 1050A

Wed Apr 3 22:56:28 EDT 2013

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
>
> On 4/3/2013 6:35 PM, paul swed wrote:
>> Bob I have no schematics but some pics might be helpful in trying to
>> understand why the 7818 has not incoming voltage. I speculate the 
>> unit plus
>> into 110 VAC?
>> The TNCs almost make sound like some cel tower thing.
>> Regards]
>> Paul
>> WB8TSL
>>
>>
>> On Wed, Apr 3, 2013 at 3:07 PM, Tom Knox<actast at hotmail.com>  wrote:
>>
>>> Hi Bob;
>>> I was wondering who won the unit. They are very nice oscillators. With
>>> noise on older equipment like the 1050A I would check  and/or 
>>> replace caps.
>>> I am about to do that to my own 1050A. It may not resolve the 
>>> problem, but
>>> it will eliminate that possibility. I look forward to hearing how the
>>> problem is resolved.
>>> Best Wishes;
>>> Thomas Knox
>>>
>>>
>>>
>>>> Date: Wed, 3 Apr 2013 14:53:55 -0400
>>>> From:bobdarby at triad.rr.com
>>>> To:time-nuts at febo.com
>>>> Subject: [time-nuts] Question about FTS 1050A
>>>>
>>>> I purchased an FTS 1050 recently and after a cursory inspection of the
>>>> interior powered it up to see if it's functional.
>>>>
>>>> This particular unit is a bit odd; it has the optional battery 
>>>> back-up,
>>>> no PPS, and instead of the usual 1Mhz, 5Mhz, 10Mhz it has four 10Mhz
>>>> outputs with tnc female connectors.
>>>>
>>>> The tnc connectors are a bit of a bother but I found that the scope
>>>> probe sleeve that fits a bnc also fits into a tnc so I'm able to view
>>>> the outputs.  They are not pretty, lots of hash, particularly at the
>>>> zero crossings and only about 15 to 20mV rms.  That's the case for all
>>> four.
>>>> The oscillator is an FTS 1000B-503 which is supposed to have four
>>>> buffered outputs at 5MHz; two at 1.0 V rms and two at 0.5 V rms. Two
>>>> outputs each drive a pair of frequency doublers that thus provide the
>>>> four 10Mhz outputs.  I got a connector on one of the spare outputs to
>>>> see if the problem might lie in the oscillator. What I see there is a
>>>> very stable clean sine wave at 5MHz at about 660mV rms so I'm assuming
>>>> the 1000B is not my problem.
>>>>
>>>> The doublers are housed in a tidy box adjacent to the oscillator with
>>>> 22V and ground, two 5MHz inputs and four 10MHz outputs all in the top
>>>> cover.  There is a stone cold 7818 in a TO-3 metal can mounted on one
>>>> side of the box but no external connections other than those 
>>>> previously
>>>> noted.  It seems to me my problem must lie in this area and, since all
>>>> four circuits are similarly affected, is probably related to the power
>>>> supply housed therein.
>>>>
>>>> This is probably obvious to all of you but I'm a toolmaker by trade so
>>>> this is all new to me and second opinions will not hurt my feelings.
>>>> Also does anyone have any experience inside of the doubler box or a
>>>> schematic of the standard (or any other version) doubler/divider for
>>>> these things?
>>>>
>>>> Thanks for any insight anyone can offer.
>>>>
>>>> Bob Darby
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