[time-nuts] Clarification of purpose of trace in PCB board
dforbes at dakotacom.net
Thu Aug 3 17:56:34 EDT 2006
> Hello everyone,
> In my daily eBay search for (gps*, distrib*)
> I found item: 330012701666
> which is an 806-849 MHz Distribution amplifier.
> When I looked at the JPEG:
> I was a bit confused as the the purpose of the
> large circular trace which held a "snake" like
> trace within it.
> At first glance, it seemed that the circular trace was connected
> at both ands to the "snake" trace but there is a resistor
> So it seems that the "snake" like trace should be the
> same length of the semi-circle to match the phase.
> My question is: why would there be a resistor there?
> Why have the two semi-circular ends connected in such a way?
> George Hrysanthopoulos, N2FGX
See this page for a description of why that resistor is needed in a
Wilkinson power divider (which is what you're looking at).
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