OK I guess that makes sense to me also. The only thing is that I normally
do NOT listen to beacons with a narrow filter. I tune across the bands with
the wide filter, as it is easier to hear stations and then after I hear
them, and discover I want to work them, I throw the narrow filter on. Its a
whole lot easier to hear than tuning across with a narrow filter to start
with. Digital or other stations are therefore heard along with the cw
stations, originally.
Danny Douglas N7DC
ex WN5QMX ET2US WA5UKR ET3USA
SV0WPP VS6DD N7DC/YV5 G5CTB all
DX 2-6 years each
.
QSL LOTW-buro- direct
As courtesy I upload to eQSL but if you
use that - also pls upload to LOTW
or hard card.
moderator [EMAIL PROTECTED]
moderator http://groups.yahoo.com/group/DXandTalk
----- Original Message -----
From: "Dave Bernstein" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Thursday, February 22, 2007 11:27 PM
Subject: [digitalradio] Re: 14100.5 kHz USB - ALE Channel Bandwidth, IARU
Beacon Guardband
> Bonnie's detailed explanation looked reasonable to me.
>
> I often use the NCDXF propagation beacons and have rarely heard them
> QRM'd by digital signals.
>
> 73,
>
> Dave, AA6YQ
>
> --- In [email protected], John Bradley <[EMAIL PROTECTED]>
> wrote:
> >
> > In other words Tony, despite decades of tradition of having the CW
> beacons on 14100, the ALE users don't give a rat's butt for anyone
> except a small number
> > of ALE users.
> >
> > and the only reason they are doing this is because they can.
> >
> > John
> > VE5MU
> >
> >
> >
> >
> > Subject: [digitalradio] 14100.5 kHz USB - ALE Channel Bandwidth,
> IARU Beacon Guardband
> >
> >
> > > Tony KT2Q wrote
> > >
> > > Bonnie,
> > >
> > > Not sure if it's been said before, but the
> > > 14100.5khz ALE data channel seems awfully close
> > > the NCDXF beacon frequency on 14100.0.
> > >
> >
> > Hi Tony,
> >
> > Yes, it is has been covered before in HFLINK group, and via direct
> > communication with IARU Region frequency coordination. I will
> gladly
> > cover it again for the benefit of new ALE operators and the
> > digitalradio group. This ALE channel has been in use for a long
> time
> > and there have been no complaints or problems.
> >
> > The 14100.5 kHz USB ALE channel has been frequency coordinated
> with
> > the IARU Regions, including IARU Region 1, which has the widest
> beacon
> > guardband (+/-1 kHz) for the IARU-NCDXF beacon at 14100.0 kHz CW.
> IARU
> > Region 2 and IARU Region 3 both have lesser (+/-500Hz) guardbands
> for
> > the IARU-NCDXF beacon CW channel. The ALE channel conforms to the
> more
> > strict IARU Region 1 requirements.
> >
> > All amateur radio ALE channels are based upon accurate calibration
> > within +/-20Hz and standard fixed audio frequencies. The ALE
> system
> > inherently fails to operate if these rigid standards are not
> followed.
> > All ALE operators are admonished to operate with the highest
> technical
> > standards.
> >
> > The lowest tone of the 8FSK ALE signal is exactly 750Hz and the
> > highest tone is exactly 2500Hz. For the 14100.5 kHz USB channel,
> it
> > translates to RF frequencies:
> > 1. Lowest tone = 14101.25 kHz
> > 2. Highest tone = 14103.00 kHz
> >
> > The 1750Hz "bandwidth" for the 8FSK signal has a spectrum that is
> > widened slightly (+/-200Hz) by the transition of the shifting of
> the 8
> > FSK tones at the 125 baud (symbol) rate. The -23dBc bandwidth of
> the
> > RF spectrum of the 8FSK ALE signal is 2150Hz and the low end is
> > equivalent to an audio frequency of 550Hz.
> >
> > 14100.5 kHz + 550Hz = 14101.05 kHz
> >
> > Beacon guardband clearance bandwidth:
> >
> > Top edge of IARU Region 1 beacon guardband = 14101.00 kHz
> >
> > Bottom edge of 14100.5 kHz USB ALE Channel = 14101.05 kHz
> >
> > Channel Edge to Beacon Guardband Edge Clearance = 50Hz.
> >
> > Maximum allowed calibration frequency error = 20 Hz.
> >
> > Total clearance including calibration error = 30 Hz.
> >
> > The ALE channel meets the strictest IARU Region 1 recommended
> > guardband by 30 Hz and meets the less strict IARU Region 2 and
> IARU
> > Region 3 by 530 Hz.
> >
> > 73---Bonnie KQ6XA
> >
> > .
> >
> >
> >
> >
> >
> >
> > --------------------------------------------------------------------
> ----------
> >
> >
> > No virus found in this incoming message.
> > Checked by AVG Free Edition.
> > Version: 7.5.441 / Virus Database: 268.18.3/697 - Release Date:
> 2/22/2007 11:55 AM
> >
>
>
>
>
>
>
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