Topband: Palomar R-X Noise Bridge

[Carl]

----- Original Message ----- 
From: "Jim Brown" <jim at audiosystemsgroup.com>
To: <topband at contesting.com>
Sent: Friday, February 14, 2014 4:16 PM
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


Isnt that what "lowest loss" means? At least that was my intention.
On 6M Ive used a 7/8" Heliax stub to kill harmonics getting into the police 
system 200' away.

Carl
KM1H