[Amps] FL2OOOB

[Mike Schatzberg]

----- Original Message ----- 
From: "Mike Schatzberg" <cherokeehillfarm at earthlink.net>
To: "Jim Reid" <reidj021 at hawaii.rr.com>
Sent: Tuesday, October 11, 2005 6:46 PM
Subject: Re: [Amps] FL2OOOB


> PS....I wonder if Dave Leeson, W6NL, published that in his book on Yagi
> antennas?
>
> 73,
>
> Mike
> WB2AJI
> ----- Original Message ----- 
> From: "Jim Reid" <reidj021 at hawaii.rr.com>
> To: "Mike Schatzberg" <cherokeehillfarm at earthlink.net>; "ZL2AAA"
> <zl2aaa at paradise.net.nz>; <amps at contesting.com>
> Sent: Tuesday, October 11, 2005 4:54 PM
> Subject: Re: [Amps] FL2OOOB
>
>
> >
> > > The first thing to try is to lengthen the coax between the amp and the
> > > transceiver.
> > >
> > > I would recommend that the cable be at least 20 feet in length, RG 8
> type
> > > coax.
> >
> > Yes,  Dave Leason wrote a piece about this coax "transformer effect"
> several
> > years ago.  His explanation,  the coax "circuit" forms a double peaked,
> broad
> > band impedance match.  I have forgotten the math,  but recall it did
make
> > sense.  Others claimed all the coax did was introduce some loss,
> > in effect "fooling" the reflections into believing the mismatch was
> > not so bad.  Such lossy padding is very common in microwave
> > circuits.  But Dave's math did show loss is not the controlling
> > variable here,  it is,  in fact a broad band,  double resonant
> > impedance transformation device which solves the match problem
> > Interesting stuff,
> >
> > Best Jim  W6KPI/KH6
>