Makes sense. The lower the return-loss, the deeper the null!
73,
Charlie, K4OTV
-----Original Message-----
From: Topband [mailto:topband-bounces@contesting.com] On Behalf Of Jim Brown
Sent: Friday, February 14, 2014 4:17 PM
To: topband@contesting.com
Subject: Re: Topband: Palomar R-X Noise Bridge
On 2/14/2014 10:55 AM, Carl wrote:
> The highest VF and lowest loss produces the deepest null but also the
> least deep null bandwidth due to the higher Q.
Not always -- stubs made with higher Vf cables are longer, so in my
experience they come out about the same for attenuation and bandwidth.
The only way to get a deeper null (with the reduction in bandwidth you
have noted), is to reduce the RF resistance -- this means larger
diameter coax and a more robust shield, like hard line.
73, Jim K9YC
_________________
Topband Reflector Archives - http://www.contesting.com/_topband
_________________
Topband Reflector Archives - http://www.contesting.com/_topband
|