[AMPS] Re:More Relevant SWR FINAL EXAM

[Jon Ogden]

Jan.E.Holm@telia.se wrote:

>     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.

Hi Jim,

Well, I don't know how big it would be!  The ferrite pieces would indeed be huge and probably pretty lossy.  In fact, the garnets (a special type of ferrite) probably couldn't be manufactured.  I suppose you could build the isolator on some type of ultra high dielectric circuit board to shrink the size.  But then you have more losses, etc.  My example was strictly theoretical and I probably should have used a higher frequency in my example!

I have seen an isolator for 450 MHz that was about 1.5" square.  That is the smallest I've ever seen for that low a frequency.

In my days of designing microwave and cellular amps, we'd use them all the time to fool the amplifiers into thinking they were running into 50 Ohm loads!

73,

Jon
KE9NA


--------------------------------------------------------------------------
The Second Amendment is NOT about duck hunting!


Jon Ogden

jono@enteract.com
www.qsl.net/ke9na

"A life lived in fear is a life half lived."


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