[1000mp] ARRL REVIEW ROOFING FILTER

[D. J.]

Ten db is quite a bit.  Like going from 100 watts to 1000 watts.

If you understand what the roofing filter does then it's easy to see 
how going from a 12 khz wide roofing filter to a 4 khz wide one will 
improve receiver performance in the pileups and contests.  If you are a 
rag chewer weekday afternoons then save your money.

Dale


On Dec 23, 2004, at 13:01, Ron wrote:

> Come on now  I have been there.   There  is no  way that anyone can 
> tell the difference between -69 and -79 .  The ear is just not that 
> good.  Sorry.  A lot of hype out there to sell radios and filters.   
> You spent the money and wanted to hear and improvement so did.  The 
> mind work wonders to do what you want it to do.
> Ron   WA0KDS
>
>
>
> D. J. wrote:
>
>> Dirk,
>>
>> Here are some numbers:
>>
>> MKV noise floor before the INRAD roofing -123 and after -130
>>
>> Blocking at 20 khz spacing before 130 db   after 146 db
>> 5 khz spacing before 105 db after 130 db
>> 1 khz spacing before 104 db after 106 db
>>
>> IMD dynamic range 20 khz spacing before 88 db after 93
>> 2 khz spacing before 69 after 79
>> On Dec 23, 2004, at 10:51, ON4ADZ wrote:
>>
>> The report says "improvement is notable".
>>
>>  I have it installed in my own MKV and It's a noticeable improvement 
>> without affecting the normal SSB audio.  AM even sounds ok to my old 
>> ears.  I highly recommend it.
>>
>> 73
>> Dale, K9VUJ
>>
>>
>>> Dear
>>>
>>> I am intrested in a summary of this arrl only member review.
>>>
>>>
>>> With thanks,
>>>
>>> ON4ADZ
>>> dirk
>>> on4adz at skynet.be
>>>
>>> _______________________________________________
>>> 1000mp mailing list
>>> 1000mp at mailman.qth.net
>>> http://mailman.qth.net/mailman/listinfo/1000mp
>>
>>
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>
>
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