Does anyone have tuning instructions for these?
The pass is easy, and it's done, but I don't see how to adjust the
notch frequency.
Thanks
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Dave,
Here's the WP-678 tuning instructions:
http://www.repeater-builder.com/wacom/wp678-665-UHF-tuninginstructions.pdf
73, Eric Lemmon WB6FLY
Dave VanHorn wrote:
> Does anyone have tuning instructions for these? The pass is easy, and
> it's done, but I don't see how to adjust the notch frequ
At 01:05 AM 6/15/2005, Eric Lemmon wrote:
>Dave,
>
>Here's the WP-678 tuning instructions:
>
>http://www.repeater-builder.com/wacom/wp678-665-UHF-tuninginstructions.pdf
AH! It's under the covers! I didn't know if those were screws or
covers, or what.
Thanks, all done now, it only takes a few mi
Dave,
Congratulations! It's always good to hear about successes in duplexer tuning.
(The dust covers on those Johansen tuning capacitors have fooled a LOT of
people!)
One little tip: If you want to squeeze the utmost performance from your
duplexer,
but your spectrum analyzer doesn't have the
At 05:18 PM 6/15/2005 -0700, you wrote:
> It sometimes helps to
>use 6 dB attenuators on either side of the cavity when tuning in this
manner, so
>that a relatively uniform impedance is presented.
<---I would argue that you should ALWAYS use a pad (3 or 6 dB) when tuning
a cavity. If for no oth
> If the jumper cables are the
>correct length, the combined performance of the cavities *should* be
>the sum of the
>individual cavities, minus the losses in the jumpers.
That is a question, it was on 460-ish, now 440-ish.
Seems like still a relatively small change, but I don't know EXACTLY
Always terminate the un-used port in a 50 ohm load. A 20 dB pad
will work here as the return loss is 40 dB.
Neil - WA6KLA
Ken Arck wrote:
>
> At 05:18 PM 6/15/2005 -0700, you wrote:
>
> > It sometimes helps to
> >use 6 dB attenuators on either side of the cavity when tuning in
> >thi
At 02:21 PM 6/21/2005, Neil McKie wrote:
> Always terminate the un-used port in a 50 ohm load. A 20 dB pad
> will work here as the return loss is 40 dB.
Termination is easy, and inexpensive.
I've just begun to build my library of attenuators.
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At 12:21 PM 6/21/2005 -0700, you wrote:
>
> Always terminate the un-used port in a 50 ohm load.
<---Of course but I'm a firm believe in using a pad on every port. It's the
only way to guarantee a 50 ohm load on them.
Ken
--
At 6/21/2005 12:46 PM, you wrote:
>At 12:21 PM 6/21/2005 -0700, you wrote:
> >
> > Always terminate the un-used port in a 50 ohm load.
>
><---Of course but I'm a firm believe in using a pad on every port. It's the
>only way to guarantee a 50 ohm load on them.
>
>Ken
How very true. I once tried t
At 03:12 PM 6/21/2005, Bob Dengler wrote:
>At 6/21/2005 12:46 PM, you wrote:
> >At 12:21 PM 6/21/2005 -0700, you wrote:
> > >
> > > Always terminate the un-used port in a 50 ohm load.
> >
> ><---Of course but I'm a firm believe in using a pad on every port. It's the
> >only way to guarantee a 50 o
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