Hi Ron,
If they spread out a bit, the average dB across the spectrum would be the
same but the peaks would be less.
-----Original Message-----
From: RTTY [mailto:rtty-bounces@contesting.com] On Behalf Of RTTY
Sent: Thursday, April 17, 2014 8:58 PM
To: rtty@contesting.com
Subject: Re: [RTTY] Estimating increase in bandwidth/interfeerence
fromWinlink if RM11708 is approved
Terry one thing the model doesn't take into account, unless I missed
something, is the fact that the Winlink stations will spread out
horizontally even more to avoid interfering with each other. Funny how they
worry about RMS to RMS interference and they're even fussy about ALE
bothering them.
Ron
K0IDT
----- Original Message -----
From: "RTTY" <rtty@contesting.com>
To: "'RTTY'" <rtty@contesting.com>
Cc: "'Dick Hanson'" <dick@dkhanson.com>; "'Angelo Glorioso'"
<n5uxt@hotmail.com>; "'David Woolweaver'" <k5rav@ix.netcom.com>; "'Ted
Rappaport'" <tedrappaport@verizon.net>; "'Mark'" <k5xh1963@gmail.com>; "'Dan
White'" <hdwhite@charter.net>; "'John Robert Stratton'"
<N5AUS@n5aus.com>
Sent: Thursday, April 17, 2014 8:36 PM
Subject: Re: [RTTY] Estimating increase in bandwidth/interfeerence
fromWinlink if RM11708 is approved
> Thanks to inputs from Ted, N9NB, the model was changed where the
> results are now in dB showing the additional interference if current
Winlink stations
> move to RM11708 max bandwidths of 2.8 KHz. The average interference
> across the modeled 40 meter spectrum is 3.4 dB. And yes, interference is
> the correct term since the stations are all automated and do not have
> working busy frequency detectors.
>
> The new graph in dB can be seen at:
> http:\\64.128.19.154\Images\RM11708-2.jpg
>
> Two new assumptions were added to the list:
> 1. The model assumes a linear Power Spectral Density, PSD. That
> simplifies the model but it lowers the final results a bit
> 2. Each 100 Hz frequency bin starts at a count of 1 (rather than 0)
> which keeps the dB/power ratio math in check
>
> Terry AB5K
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