Topband: Palomar R-X Noise Bridge

[Charlie Cunningham]

Makes sense. The lower the return-loss, the deeper the null!

73,
Charlie, K4OTV



-----Original Message-----
From: Topband [mailto:topband-bounces at contesting.com] On Behalf Of Jim Brown
Sent: Friday, February 14, 2014 4:17 PM
To: topband at 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


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