[1000mp] ARRL REVIEW ROOFING FILTER

[Ed Gosch]

I can't seem to find were anyone stated that they could hear the
difference between -69db and -79db by ear.  The league uses test
equipment for their measurements.  On the other hand, at 5khz,
normal ears should be able to detect a difference between 105db
and 130db.
Ed  W2UV


-----Original Message-----
From: 1000mp-bounces at mailman.qth.net
[mailto:1000mp-bounces at mailman.qth.net]On Behalf Of Ron
Sent: Thursday, December 23, 2004 2:02 PM
To: All about Yaesu 1000mp
Subject: Re: [1000mp] ARRL REVIEW ROOFING FILTER


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
>>
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>
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