artie wrote:
In article , Murray Green, K3BEQ
wrote:
Another ham friend and me both have 100 w slugs for 100-250 Mhz. (100c).
Both are bad. Tests were made on three different Bird meters and a 3rd
slug known to be good.
On all 3 meters inputting 100 w, the good slug showed 100 watts while
the two bad ones showed 70 w and 60 w respectively. Pretty high odds
that we both would have faulty slugs eh?
So the questions a what happened to make them go bad, and can they
be reasonably repaired by the Bird Corporation? Although we will
be calling Bird personnel next week I thought I would throw out the
question here.
Last but not least, any good 100w 100-250 Mhz slugs out there for sale?
73 K3BEQ
Could have been as simple as dropping them -- which is why I'm hesitant
to buy slugs at hamfests if I can't check 'em out. Don't remember what
frequency the crossover occurs, but at a fairly low frequency, around 2
meters iirc, coupling in the slug changes from a variable capacitor
that's adjusted to making the adjustment by moving the coupling
element.
The coupling adjustment is underneath the label on the top of the slug.
Bird used to offer a recal service that was fairly reasonable.
Oh, and you are using a good dummy load for those tests, like a Bird
dummy load that's still providing a flat 50 ohm load at your test
frequency, right?
(I've got a "new" Bird -- it's only about 30 years old.)
--
Namaste--
|