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Thread: [EE] Phase locking DRO's
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face picon face BY : Alan B Pearce email (remove spam text)



>One also has to match the cable delays to within an IF wavelength. One also
>introduces an 'offset' in the LO to accommodate the look angle and it's effects
>on path length.

Perhaps it did not come across clearly enough in what I wrote, but I envisaged
that these could be taken care of by the phase offset of the LO. I guess the
problem here is the cable length can be significantly more than 360 degrees at
the LO frequency! Certainly I expected to be able to adjust the look angle
factor with the LO, but I guess the physical spacing again becomes more than 360
degrees.

>In theory one doesn't even need a D/A, just PWM and a LPF.

I would have thought this could introduce a heap of unwanted sidebands on the LO
due to filtering difficulties. Also I figured that the D/A would have much finer
control steps for the LO, without going through the math of just how fine they
may need to be.

<007501bfc554$ef010750$5dbdf682@ssdwkiwi.AG.rl.ac.uk> 7bit

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Subject (change) [EE] Phase locking DRO's

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