Yes a very correct discription by Larry. Over here circulators
are also very common on 160 and 80 MHz, never seen any below
80 MHz however.
73, Jim SM2EKM
PS: Yes I´ll bet it will be a big mother on 14 MHz, maybe
KE9NA could figure out how big since he did bring it up.
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-----Ursprungligt meddelande-----
Från: w7iuv@axtek.com [SMTP:w7iuv@axtek.com]
Skickat: den 12 oktober 1999 03:40
Till: phil@vaxxine.com; amps@contesting.com
Ämne: VB: Re: [AMPS] More Relevant SWR FINAL EXAM
At 09:27 PM 10/11/99 -0400, Phil T. (VA3UX) wrote:
>Ah, Rich didn't criticize anything Jon...he just asked a question. He
>asked because "isolator" probably isn't part of the common jargon in RF
>circles for a device that does what you describe...."attenuator" is the
>commonly used technical term. "Isolator" appears to be ham radio
marketing
>jargon.
An "isolator" is a "circulator" with a built-in termination on one of
the
ports. It does not have to be 50 ohms, but usually is because it's
almost
always used at microwave. A circulator (or Isolator) for 14 MHz would
certainly be big enough to kill you if it fell on you. I have never
actually seen a circulator for any frequency lower then 450 MHz. If you
scaled the 450 model to 14 MHz, it would be about 15 feet square and the
magnet would suck the filling out of your teeth from 20 feet away. Wish
I
had one here!
73,
Larry - W7IUV
w7iuv@arrl.net
http://www.axtek.com/w7iuv
Amp pix at http://207.108.137.61
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