[time-nuts] puzzling level and harmonics partially solved
paulswedb at gmail.com
Wed Jan 27 19:26:28 UTC 2016
Walter if you can get it back to the basic clean oscillator thats great.
Since you have access to a lot of older equipment you might have old video
amplifiers are a fine way to get some more outputs. Most of the 6 MHz amps
actually go higher and the later amps were typically good to 30 MHz. I just
suspect you may have access to those types of amps.
Depending on the quality of the amp there may be sync clamping and it was
always possible to disable that. There were also high end eq that could be
adjusted to raise the frequency.
Certainly not the lowest noise but may be pretty handy for at least now.
On Wed, Jan 27, 2016 at 1:14 PM, walter shawlee 2 <walter2 at sphere.bc.ca>
> thanks to all that sent me info on this issue. it proved very helpful.
> digging into the smd chinese add-on board tied to the oscilloquartz
> ovenized oscillator, I discovered something unexpected.
> the 2 outputs are in fact just tied together though a forest of series
> inductors and shunt caps and then tied right to the to the oscillator
> so, the reason the level is so low, and the harmonics so high is that both
> outputs are
> in parallel through very lossy networks. I am not sure what the intent
> was, but the result was to over-load the 50 ohm output of the oscillator,
> and then dissipate most of the signal. maybe this was some kind of 10Mhz
> bandpass filter, but now I need to dig right back to the oscillator and see
> if it is even needed.
> I will see if this can be patched to at least work properly with a single
> output. all the circuitry on the underside is actually just a
> fantastically complicated (to no good end) 12V power supply, and bias for
> the efc pin. sigh...
> I got a second unit at the same time off ebay, it does not work at all, if
> you plug into the power jack, it kills the power. I was able to tease it
> into operation, and it has the exact same problems. clearly QA is not the
> strongest feature with this vendor (amoj1010).
> all the best,
> Walter Shawlee 2, President
> Sphere Research Corporation
> 3394 Sunnyside Rd., West Kelowna, BC
> V1Z 2V4 CANADA Phone: (250) 769-1834
> walter2 at sphere.bc.ca
> WS2: We're all in one boat, no matter how it looks to you.
> Love is all you need. (John Lennon)
> But, that doesn't mean other things don't come in handy. (WS2)
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