[1000mp] W2VJN Comments on Roofing Filter IF Adjustment

[Bruce Bowman]

I'd appreciate a copy of the data. Thank you for offering!

Bruce Bowman, NM5B
Santa Fe, NM

----- Original Message ----- 
From: "Rick Moskovits" <rick.moskovits at ns.sympatico.ca>
To: "All about Yaesu 1000mp" <1000mp at mailman.qth.net>
Sent: Tuesday, February 01, 2005 10:42 PM
Subject: Re: [1000mp] W2VJN Comments on Roofing Filter IF Adjustment


> Hi Mike, I would sure appreciate a look at that data also. thanks, 
> Rick ve1rnm
>
> Mike Schatzberg wrote:
>
>> Hello Pete:
>>
>> Well, comparison testing has already been done, and published, on the 
>> before
>> and after results of the Inrad mod,
>> with adjustments having been made in the IF gain menu to equalize the 
>> S
>> meter reading after the mod.  You probably
>> have seen the QST review, but I think this review made with the 
>> reduction to
>> the IF gain in menu 9-1 is more real world.
>>
>> If you are interested in the data, published by Peter Hart, G3SJX, a
>> reviewer for RadCom, the RSGB
>> publication, I would be please to provide that information off list.
>>
>> His data confirms what has been posted here in the past.
>>
>> Regards,
>>
>> Mike Schatzberg
>> WB2AJI
>> ----- Original Message -----
>> From: "Pete Smith" <n4zr at contesting.com>
>> To: "All about Yaesu 1000mp" <1000mp at mailman.qth.net>; "All about 
>> Yaesu
>> 1000mp" <1000mp at mailman.qth.net>
>> Sent: Tuesday, February 01, 2005 4:53 PM
>> Subject: Re: [1000mp] W2VJN Comments on Roofing Filter IF Adjustment
>>
>> > For what it is worth, this quietness business has always been a 
>> > subject of
>> > some debate; there are technically competent people who argue 
>> > forcefully
>> > that the gain redistribution accomplished by the IF mod and the 
>> > later
>> > roofing filters may actually degrade IMD performance while 
>> > improving
>> > MDS.  But I do wonder whether Inrad feels that the later roofing 
>> > filter
>> > units really do offer the same improvement in MDS as the IF mod.
>> >
>> > 73, Pete N4ZR
>> >
>> > At 03:57 PM 2/1/2005, Mike Schatzberg wrote:
>> >
>> > >Hello Pete:
>> > >
>> > > >From an insertion loss point of view, permitting a significant
>> reduction in
>> > >IF gain setting, in menu 9-1, and thus accomplishing both the 
>> > >stated
>> > >promised improvements in IMD reduction, whiskering, etc., as well 
>> > >as the
>> > >unstated improvement in noise floor reduction.  The later 
>> > >production
>> units,
>> > >which may have the lower insertion loss crystal filters,  as 
>> > >perhaps does
>> > >yours for all anyone knows, will function to serve as both mods 
>> > >( roofing
>> > >filter and IF amp) at once.
>> > >
>> > >This does not mean the earlier filters do not work.  The later 
>> > >ones
>> > >apparently further improve the quietness of the receiver also.
>> > >
>> > >Regards,
>> > >
>> > >Mike
>> > >----- Original Message -----
>> > >From: "Pete Smith" <n4zr at contesting.com>
>> > >To: "All about Yaesu 1000mp" <1000mp at mailman.qth.net>; "All about 
>> > >Yaesu
>> > >1000mp" <1000mp at mailman.qth.net>
>> > >Sent: Tuesday, February 01, 2005 3:37 PM
>> > >Subject: Re: [1000mp] W2VJN Comments on Roofing Filter IF 
>> > >Adjustment
>> > >
>> > >
>> > > > I do not understand this statement.  Do you mean 
>> > > > late-production
>> roofing
>> > > > filters are better, or what?
>> > > >
>> > > > If the former, then I doubt George would agree with you.  I 
>> > > > have a
>> second
>> > > > run roofing filter, and certainly feel it is a huge improvement 
>> > > > in my
>> Mark
>> > >5.
>> > > >
>> > > > 73, Pete N4ZR
>> > > >
>> > > > At 02:52 PM 2/1/2005, Mike Schatzberg wrote:
>> > > > >The newer crystal filters are working incredibly well, far 
>> > > > >more
>> > >efficiently
>> > > > >than the earliest units which were produced by Inrad.
>> > > >
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