Jerry is absolute correct. If one wishes to measure reflected power then
the slug to correctly use is the one that will also measure the forward
power. Thus if forward power is 500 watts then that slug should be used to
measure reflected power. Don't try to get "magnification" of reflected
power by using a lower power slug. It's bad on the slugs.
----- Original Message -----
From: "Dr. Gerald N. Johnson" <firstname.lastname@example.org>
Sent: Friday, December 28, 2007 11:43 AM
Subject: Re: [TenTec] Bird Model 43 Slug For Sale
> On Thu, 2007-12-27 at 22:14 -0600, Donald L. Schliesser wrote:
>> I have a Bird 5D (Silver Label) 5W 200-500 MHz slug for Sale.
>> Perfect for Reverse Power (SWR) Adjustments.
>> No dings or scratches - comes in protective plastic case.
>> $45 includes shipping and Insurance CONUS.
>> Please reply direct. Donald, K6RV
> Not necessarily perfect for reverse power adjustments. The directivity
> of the element may mean the forward power is coupled to the diode, but
> only 30 dB down if that much and that can confuse the reflected power
> indication to get a cancellation only when the load isn't 50 ohms.
> Beyond that the lack of perfect directivity can easily over drive the
> element. And then the diode can go bad without even venting any smoke.
> 73, Jerry, K0CQ
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