[1000mp] roofing filter and menu 9.1

[Jim W7RY]

I did a before and after measurement with a signal generator. I determined 
the S-9 signal level before I installed the mod and after the mod, I had to 
turn the IF gain down from 13 to 9 to achieve the same S meter reading with 
the same signal input to the receiver.

  BTW this level was within a few dB of 50uV for a S-9 indication.

I also made a MDS measurement as well.   (Minimum Discernable Signal).

You need a stable and  signal source to make this measurement.  An over the 
air signal is just to un-reliable.

73
Jim W7RY




At 04:24 PM 1/23/2005, Bob Main wrote:
>Just wondering how do you know what to turn it down to?
>
>Bob
>KB4CL
>
>----- Original Message ----- From: "Jim W7RY" <w7ry at centurytel.net>
>To: "All about Yaesu 1000mp" <1000mp at mailman.qth.net>; 
><1000mp at mailman.qth.net>
>Sent: Sunday, January 23, 2005 6:36 PM
>Subject: Re: [1000mp] roofing filter and menu 9.1
>
>
>>When I installed my roofing filter in my MK-V 1000 MP I had to turn my 
>>menu 9.1 from 13 down to 10.
>>
>>You most likely will need to do the same.
>>
>>73
>>Jim W7RY
>>
>>
>>At 01:27 PM 1/23/2005, Kostas SV1DPI wrote:
>>>  I added the roofing filter in my MARK V.
>>>     Does it need to decrease this value?
>>>     I read in inrad manual that i need to increase if i had IF mode =
>>>     installed (i didn't).
>>>     I had the impression reading the emails here that i must decrease it.
>>>     I noticed that s-meter is wrong now (without decreasing the 9.1 menu)
>>>     Confused.....
>>>     Kostas SV1DPI
>>>
>>>
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>>
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