[1000mp] Monitor roughness

[Harry Yingst]

Tom check the archives, as I had previously answered this with an easy
procedure





--- tbeltran <tbeltran@earthlink.net> wrote:
> > 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.
> 
> Tom I agree with you 100%.  At least for me, the interest in the
> S-meter
> reading, is just to properly set the Inrad front-end mod, not for the
> sake
> of an accurate S-Meter.  I have Drake, Collins and other receivers
> here, and
> each one has different S-meter characteristics - I use the S-meter
> just as a
> relative reading for the signals on that particular band and that
> radio.
> Perhaps, though, others in this thread have an interest in an
> accurate
> reading - just not me.
> 
> So, the $ 64,000.00 question (adjusted for inflation, of course), is
> how do
> I adjust the IF gain to opitimze receiver performance?
> 
> I think there should have been a front panel knob, so that it could
> be
> easily varied, as conditions change, or a quick menu entry, like the
> NB or
> notch filter.  [I noticed that even on my 75A-4, that there is an IF
> gain
> pot inside.]
> 
> I think the "official" method involves the S-meter, where a very low
> signal
> is injected, and the IF gain is adjusted, so that there is a one
> segment
> S-meter reading. At least for me, this is why I have focused on the
> S-meter.
> I have the Elecraft XG-1, that puts out a 1 and 50 microvolt signal
> on
> 7.040, but neither are the signal specified by Yaesu.  My 606A just
> is not
> accurate enough.  So it appears that you are suggesting then, that
> there is
> a method of adjusting the IF gain, that is independent of the
> S-meter.  Can
> you elaborate?  Tom W6EIJ
> .
> 
> 
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=====
Harry - AB2PN

-

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