[1000mp] Monitor roughness

Tue, 9 Mar 2004 08:13:40 -0700

I wouldn't adjust my IF gain to make the S-meter read correctly.  That's
a rather arbitrary criterion for setting that value (and would only be
correct for one band, and for one setting of "tuned" vs. "flat").
Instead, you should adjust the IF gain to opitimze receiver performance.
The IF gain setting will affect the "hiss" level you hear, and it will
also affect dynamic range.  You want to get the lowest noise level and
the best dynamic range, both of which are a lot more important than
having the S-meter set to some particular value.

73,
Tom / W7GT

-----Original Message-----
From: [email protected] [mailto:[email protected]]
On Behalf Of WX5L
Sent: Tuesday, March 09, 2004 3:05 AM
To: [email protected]
Subject: Re: [1000mp] Monitor roughness

I have read that an input of -73 dbm should yield a S-9 on the meter.
I'm
not familiar with dbu. I have the IF gain mod in my Mark V.

With my signal generator at -73dbm I had to reduce my IF gain from 9 to
8 to
reach that value. Even at 8 and with signals of 40 over 9 there's a
slight
bit of overloading.

73,
Randy

----- Original Message ----- 
From: "Thomas Beltran" <[email protected]>
To: <[email protected]>
Sent: Tuesday, March 09, 2004 12:07 AM
Subject: Re: [1000mp] Monitor roughness

>
>
> > with a a +11 dBu signal at the antenna jack.
> > Adjust menu 9-1 for 1 bar on the S Meter.
> > Why, because the service manual says to do it this way.
> > Winds up to be about 12-13 on the menu without the Inrad front end
mod.
> >
> I wondering if someone can, after performing this process, see what
level
of
> signal is required for an S-9 reading on the S-meter.  Tom W6EIJ
>
>
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