I have in face tuned a WP-639 and would guess for that freq swing from
146.97 to 146.88 it will be very little movement of the rod assuming the
pass tuning is correct. Remember, the rexolite rod is tuning the notch
and that
notch is relative to the pass setting of the invar rod. It is extremely
sharp and
has to be moved only very slightly to find the deepest part of the
notch. Tune your
generator (HT) to the notch frequency (.28) and feed it through the
hi-pass section
of the duplexer and tune for the null. Be careful that you don't
mistakenly tune the
low-pass section of the duplexer to pass the high frequency because
sometimes
you can find a null but not the right one. I would tune it for you for
nothing but I have
no Idea where you are located and I'm sure there are others who would
also if you
would give a location so someone could respond.
Gary - K7NEY
hbbcara wrote:
>
> Hi again,
>
> In my first post I miswrote a thing or two and much confusion as to my
> question ensued. Hopefully I've written this more clearly. Thank you
> to all who responded to my earlier question and my apologies for
> wasting your time by having you answer the wrong question.
>
> I have a wp-639. I'm its at least third owner and don't know its
> previous history. It's got a factory sticker marked 146.97 / 37. I
> don't know anyone who currently has the correct equipment locally and
> I don't have the budget to take it to a radio shop so I've used
> alternate methods of tuning similar to mentioned on the repeater
> builder website. I've gotten it tuned to work OK with my repeater on
> 146.88 / 28 but I'm guessing it could be better.
>
> In tuning the pass adjustments, there was a definite "sweet spot." Go
> a quarter or a third of a turn off of that and there was a definite
> difference. But I didn't find that "sweet spot" in tuning the reject
> and I wonder how wide of an adjustment it usually is. What I mean is,
> for example the pass tuning went from "not very good" to "good" to
> "not as good" within about one turn of the knob. In tuning the reject,
> should I be looking for that pattern while moving the rexolite over an
> inch of travel, a half-inch, two inches or ?
>
> So my question is not how to tune it but as I tune it, how much should
> I expect to have to move the rexolite rods to notice the "not good –
> good – not good" pattern? Or will it even be there?
>
> I suppose the question is only to those who have tuned a wp-639 for a
> standard 600kc split. Someone who hasn't tuned a `639 will be basing
> their answer on a comparison to something they have tuned, which may
> not be all that comparable.
>
> For the sake of brevity I won't post the method I used to tune it
> unless someone wants to know it.
>
> Again, thanks to those who answered earlier and thanks in advance any
> who answer this.
>
> rj
>
>
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