[TenTec] NAR filter in Omni VI

[Jim Brown]

On Fri, 6 Aug 2004 16:02:50 -0400 (EDT), jsb at digistar.com wrote:

>
>I have an Omni VI with 2.4K, 1.8K, 500 and 250hz filters but the NAR slot
>is empty.  Can someone tell me what I would add to the NAR filter for CW
>operation and why would I want to do this when the filters that are
>already there seem to work real nice.

That's a really good question, Jason. I've made very careful (and fairly precise) 
spectrum measurements of my Omni V (just back from factory alignment) with 
exactly that set of TenTec filters , plus a 500 Hz Ten Tec filter in the NAR 
position. The addition of the 500 Hz NAR filter to the 250 Hz filter makes a 
difference so slight (on the order of 3 dB in the skirts) that you wonder why you 
bothered. A 250 Hz filter in the NAR position (which I have not measured) would 
likely make enough difference to matter, but that's REAL narrow. If you're a 
serious contester or DXer, that might be worth doing.   I would expect the 
results in your Omni VI to be the same as in my Omni V. 

I have not compared the InRad filters to the Ten Tec filters, but I just put InRad 
filters in the 746 that I use on 6m, and I am quite pleased. They are a significant 
improvement over the Icom filters, and sell for about the same price.  Maybe 
someone can comment on InRad filters in your Omni VI. 

Jim Brown  K9YC