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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