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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