Eric thanks. If I looked at return loss, would the circulator operating
frequency be determined by the lowest return loss?
Joe
At 03:01 PM 11/21/2004, you wrote:
>Joe,
>
>I suspect that RJ Communications is no longer in business, so finding
>tech data on that circulator may be difficult.
>
>The typical ferrite circulator doesn't dissipate much power itself; it's
>the load(s) attached to the reject port that determines its power
>rating.
>
>It's important that a circulator be correctly tuned to operate
>efficiently. The label 140-180 MHz refers to the range of that
>particular design, and should not be taken to mean that it will work at
>any frequency in that range. Nearly all of the circulators I have taken
>out of service from the 152 MHz band would not tune more than 2 MHz
>either side of the frequency marked on the unit. I had to send them
>back to the manufacturer to be reworked for operation on the 2m band.
>This rework involved an exchange of magnets, pole pieces, and a new
>garnet ground to a specific tolerance.
>
>A network analyzer is a must for tuning a circulator, especially a dual
>circulator, since some measurements look for transmission peaks while
>others look for return-loss peaks. A spectrum analyzer will not suffice
>for this tuning task, unless it is used with a return-loss bridge.
>
>73, Eric Lemmon WB6FLY
>
>Joe Ciarcia wrote:
> >
> > I have a circulator from RJ Communications Products Inc
> > of Scottsdale, AZ. It's a model HC-152. It also has a logo
> > on it marked IJ. It has a marking tape on it which indicates
> > that the freq coverage is 140-180 MC. Can anyone confirm this
> > and know what the power rating might be?
> >
> > Thanks, Joe
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
>
>
>
>
>
>Yahoo! Groups Links
>
>
>
>
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