The loops can be rotated a slight amount, as they are mounted in round holes on
top of the vertical cavities with the notch tuning rods extending horizontally
from the loop assembly. Three screws clamp the assembly to the can. The rods
would interfere with the cavity beside it if rotated more than 5 degrees or so.
I suppose the internal loop could be bent or twisted to space it away from the
internal quarter wave as the whole assembly lifts right out of the cavity when
you remove the screws.
I measured the jumper cables end to end including the connectors (10.5 inches)
and also measured the two new cables I made (12.5 inches) the same way.
Tinkering with the capacitance would sure be a lot more trouble than rebuilding
the cables I think, so this was definitely the right way to modify the 170 meg
duplexer down to 147 meg. If the whole harness assembly is still available
from Sinclair then Eric (WB6FLY) had the right idea to just replace the whole
thing. Just buying a couple of cables would cost $50 or so, and the whole
assembly at $150 would be a bargain.
73 - Jim W5ZIT
>That was suppose to be 10.5" of cable before the N male connectors are
>put on. Adding the connectors adds more length to the assembly.
>Where did you measure the 10.5" of cable? Rg214/u or Rg213/u both have
>the same velocity factor so the lengths would be the same.
>
>Can't remember if the loops on that configuration were rotatable.
>Rotating the loop would change the insertion loss and the pass to
>reject spacing.
>
>There are several variables that effect the overall response.
>
>Harold
>Does this mean that this vintage of the Q-202G's are only capable of working
>at one insertion loss point for any given offset?
>
>73 Paul
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