To: | [email protected] |
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Subject: | Re: LF: WSPR 502.400 Dial frequency ? |
From: | Andy Talbot <[email protected]> |
Date: | Mon, 26 Jan 2009 18:19:00 +0000 |
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Some spectrum plots of the WSPR signal can be seen at http://www.g4jnt.com/wspr-spectra/ These were generated at 1500Hz using WSPR.EXE, directly converted to RF and fed via an attenuator to an SDR-IQ for measuring and displaying the spectrum. If we use the widely accepted -40dBc criteria for adjacent channel spurii, then it is clear the transmission can be centred at up to 10Hz below the upper band edge. Andy G4JNT www.g4jnt.com 2009/1/26 Graham <[email protected]>: > > Are we to adopt 502.400 Hz USB dial frequency for WSPR ? > With 1500 Hz audio centre band tone. > > RF mid band carrier frequency of 503.900 Hz ? > > With 6 hz modulation and phase continues tone side bands and > guard band are not a issue, the band edge is protected? > > 504KHz and its sidebands are actually x2 of the fundamental > so should not present a problem as the 200 Hz slot is in a > close in, dead zone, there amplitude increasing lower into the band, > one of the reasons qrss and range testing takes place in this > 'noisy' zone. > > I will add a note to the uk500khz group and links in others with details > if > acceptable to widen the reporting base. > > Tnx- > > Graham > > G0NBD > > > > > > > > > > > > > > |
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