Add 5/8" per N male connector to the cut length cable length. 10.5"
becomese 11.75". Plus the length of the T connectors should give you
the quarter wavelength in coax (some fudging for connector velocity
factor)
You can rotate the loop in your top mounted loop Q202 by rotating the
cavity on its mounting brackets to keep the stubs in the same position.
The harness that was mentioned that could be purchased from Sinclair
was a one piece assembly for the Q202 with top mounted loops with the
variable capacitors. They will not supply an assembly for the stub
duplexers unless you aske for the 8 separate cables. No specials anymore.
Harold
--- In Repeater-Builder@yahoogroups.com, Jim Brown <[EMAIL PROTECTED]> wrote:
>
> 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
>
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/Repeater-Builder/
<*> To unsubscribe from this group, send an email to:
[EMAIL PROTECTED]
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
