[1000mp] W8JI INRAD roofing filter measurements

[Tod-ID]

Lou:

Do you suppose the 'obverse' might be true also? 

> this would suggest that NB mod does a better job than the 
> INRAD roofing filter and that subsequently adding the INRAD 
> filter undoes some of that. Just a thought.
 
That would suggest that adding the W8JI NB mod after doing the INRAD Roofing
Filter mod reduces the effectiveness of the Roofing Filter.

I did not do the NB mod but did do the Roofing Filter mod. I almost never
use the NB and have it set to minimum all the time when not in use. My on
the air experience has been that the INRAD mod made a very significant
difference  --- but one should consider that in the context that the nearest
amateur KW station is about 25 miles away and the nearest 100 w station is
more than five miles away from my location. 

I did not run any of the tests that W8JI ran to look at the radio
performance after the INRAD mod so I have no experimental data to
contribute, only anecdotal data.

I would be interested in any comment that George might wish to contribute. I
am sure that he looked at some of these things during the process of design
and prototype building of the roofing filter.

Tod, K0TO



> -----Original Message-----
> From: Lou [mailto:louandchop at sbcglobal.net] 
> Sent: Wednesday, April 25, 2007 11:06 AM
> To: farson at shaw.ca; 'All about Yaesu 1000mp'
> Subject: RE: [1000mp] W8JI INRAD roofing filter measurements
> 
> Hmmm. Just after hitting the send key on my last post, it 
> occurred to me that there is at least one significant 
> difference in the INRAD roofing filter tests done by ARRL and 
> W8JI.  The W8JI tests were performed a rig that has his NB 
> mod and transmit gain menu adjustments.  Taken at face value, 
> this would suggest that NB mod does a better job than the 
> INRAD roofing filter and that subsequently adding the INRAD 
> filter undoes some of that. Just a thought.
> 
> Lou W7HV
> 
> 
> ______________________________________________________________
> 1000mp mailing list
> Home: http://mailman.qth.net/mailman/listinfo/1000mp
> Help: http://mailman.qth.net/mmfaq.html
> Post: mailto:1000mp at mailman.qth.net
> 
>