[Flexradio] 40m qrm with harmonics

[Brian C]

An ethernet switch could be the culprit. My next guesses would be be either an internet cable modem or a switching power supply. David, how close are you to Boulder? There is a new digital ionosonde station in Boulder, with a 4Kw amplifier, undergoing testing as of November 22, 2008. It's a VIPIR, Vertical Incidence Pulsed Ionospheric Radar installation. 
 
http://www.ips.gov.au/IPSHosted/INAG/web-69/2008/boulder_vipir.pdf
 
> CC: k3vr at hotmail.com; flexradio at flex-radio.biz> From: brian-wb6rqn at lloyd.com> To: wa3fdb at beumerfamily.com> Subject: Re: [Flexradio] 40m qrm with harmonics> Date: Sat, 29 Nov 2008 16:14:27 -0800> > > On Nov 29, 2008, at 10:21 AM, David Beumer W0DHB wrote:> > > Brian> >> > You may be on to something.. I have since found the same pattern at > > around 5> > Mhz with harmonics in 30m .> > I have also found they are in multiples about every 170Khz or so .. > > They> > swoosh through every 15 seconds or so.> > Mulitples of 170KHz? I have that. It turned out to be my Linksys > managed ethernet switch.> > > > Brian Lloyd> Granite Bay Montessori School 9330 Sierra College Bl> brian AT gbmontessori DOT com Roseville, CA 95661> +1.916.367.2131 (voice) +1.791.912.8170 (fax)> > PGP key ID: 12095C52A32A1B6C> PGP key fingerprint: 3B1D BA11 4913 3254 B6E0 CC09 1209 5C52 A32A 1B6C> > > > 
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