[1000mp] Roofing Filter

[Ken KW0A]

I recall seeing that a good way to handle it is after installation is to inject a 50 microvolt signal and adjust 9-1 for an S9 reading on the main S meter. The subVFO may not go through the same filters and the readings between the S-meters may be different to start with. This does usually correlate with adjusting the setting by 1 or 2 notches. This is also by 'selective recall'.

Ken KW0A



-----Original Message-----
>From: Art Searle W2NRA <w2nra at optonline.net>
>Sent: Feb 13, 2006 11:03 AM
>To: All about Yaesu 1000mp <1000mp at mailman.qth.net>
>Subject: Re: [1000mp] Roofing Filter
>
>Hi Douglas,
>
>I seem to remember that the only reason for the reduction was for those that 
>installed the 70MHz IF mod that required an increase in the IF gain.  The 
>later IF kits didn't.  So if you have a later IF kit installed or no kit at 
>all you should consider making no change to the IF gain on installing the 
>Roofing Filter.  Can anyone back me up on this?  This is, of course, 
>assuming my memory serves and it usually doesn't.  When it comes to memory I 
>have Selective Total Recall.
>
>73 Art W2NRA
>
>From: <KB9GKC at aol.com>
>
>>
>> In a message dated 2/12/2006 11:12:16 P.M. Central Standard Time,
>> rask1553 at bellsouth.net writes:
>>
>> Before  installing the roofing filter, I checked my IF gain setting 
>> (hidden
>> menu  9-1) and it was 31.  I believe most were claiming that the setting 
>> was
>> between 11 to 13 and that they had to reduce it one or two units after the
>> mod.  Why is mine set at 31?
>>
>>
>>
>> When the factory alignment is done the numbers for the IF gain land all 
>> over
>> the place.  Don't worry about it, just make a note of it in the manual 
>> for
>> future reference.
>>
>> Enjoy the roofing filter, it's exactly what the 1000MP needed to keep up
>> with the new radios.
>>
>> 73
>> Douglas
>
>
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K. Kreski M.D.,A.B.I.M.
KW0A  (EM48wx)
10240 Mackenzie Road
Affton, MO 63123-7301
U.S.A.

cell 314-578-1776