For 6M try setting the low value to -150 and the high value to -60 as a
starting point. I am not at my radio to see where I finally ended up for
best weak signal detection (not sure that I have it right at this point
anyhow). Before changing that, my waterfall was mostly black and only
moderate stations were displaying traces. Unfortunately, this setting
applies to all bands, so your other bands will be "hot". I also changed my
update period to 50ms. My comments refer to the 5K with a ARR 24db gasfet
preamp, so your settings may vary according to your environment and taste.
At 02:38 PM 6/26/2009 -0500, Eric Wachsmann wrote:
Note that there are parameters on the Setup Form that will allow you to
tweak the waterfall thresholds. This should allow you to find optimum
settings with the preamp on or off.
Eric
On Fri, Jun 26, 2009 at 2:31 PM, Tim Ellison <[email protected]> wrote:
> The waterfall colors equate to the signal.
>
> When you engage the PREAMP, you notice that the noise floor on the
> panadapter drops to a lower dB value, because the preamp is increasing the
> signal to noise ratio. Remember that when you engage the preamp, you have
> not changed the signal level at the antenna terminal, it stays
constant. You
> have, however; improved the signal to noise ratio with the preamp and
> therefore the noise will go down in reference to a fixed signal level,
which
> in effect raises the S/N ratio. The previous statement holds true in all
> cases except one. That is if the radio is antenna noise limited.
>
> In the above mentioned exception, atmospheric noise is a real signal just
> as the desired information carrying signal is. The only way to improve the
> S/N ratio in this case is by narrowing the bandwidth, match the
filtering to
> the characteristics of the desired signal or adjusting the AGC-T gain to
> provide maximum S/N ratio.
>
> Since the noise has decreased with the preamp on, the intensity of the
> waterfall also decreases appropriately or gets less intense.
>
>
73, Robert KR7O/YB2ARO, DM07ba/OI52ee (ex. N7STU)
[email protected]
www.vhfdx.com (KR7O/YB2ARO homepages)
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