The new Yaesu 9000 has a nifty feature called ACM (Adjacent Channel Monitor)
for situations such as this. Below are a couple of excerpts from the
manual:
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While operating on CW on the Main (VFO-A) band, the ACM feature provides a
visual indicator of encroachment by
another station (someone you may not be able to hear because of the tight
DSP filter in your FT DX 9000). The presence of
a nearby strong signal will be displayed on the Sub-receiver?s S-meter. The
Sub (VFO-B) receiver is taken over by the
ACM, when engaged, and reception on the Sub (VFO-B) band is not possible
while ACM it turned on.
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When ACM is turned on during Dual Receive operation, the audio from the Sub
(VFO-B) receiver will disappear.
A typical operating circumstance where ACM can help is when you are running
stations during a contest in a 250 Hz
bandwidth. If stations suddenly stop calling you, it may be because another
strong station has started calling CQ near
your frequency. By engaging ACM, your Sub-receiver S-meter will display the
strongest station on the area ± 1.2
kHz from your current operating frequency; if the encroaching station is
sufficiently close, you might want to ask
him or her kindly to QSY
---------------------------------------------------------------------------
I have used this on several occasions and find it to be quite helpful. One
negative is that while 250 may be a nice, quiet listening environment, I
miss letting my brain sort out the occasional caller 300 Hz away.
73, Keith NM5G
-----Original Message-----
From: cq-contest-bounces@contesting.com
[mailto:cq-contest-bounces@contesting.com] On Behalf Of David Hachadorian
Sent: Thursday, June 01, 2006 10:42 PM
To: cq-contest reflector
Subject: Re: [CQ-Contest] Contest Rig
With roofing filters, 250Hz filters, DSP, etc. I think it is possible to
totally lose situational awareness of the band.
What you, in your expensive high-tech bubble, think is a clear run
frequency, may actually be terrible, with loud stations only 200 hz on both
sides. Many S&P'ers are going to tune right by you, because it appears to
be an undecipherable mishmash. If a run frequency doesn't sound good with a
pair of 500 Hz filters, it is probably not a good frequency.
Dave Hachadorian, K6LL
Yuma, AZ
.
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