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
this
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 to tune a
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 ohm load on
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
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
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 other
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
how
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