Hi Joe,
I'll be pleased to email a pdf of Rob Sherwood's transceiver transmitted composite noise measurements to you or anyone who requests them 73 Frank W3LPL ----- Original Message ----- From: "Joe" <n...@mwt.net> To: donov...@erols.com, "CQ-Contest" <cq-cont...@contesting.com>, "Elecraft" <Elecraft@mailman.qth.net> Sent: Thursday, April 1, 2021 11:09:50 PM Subject: Re: [CQ-Contest] Transceiver transmitted composite noise at reduced output power Hi Frank, Looks like the e mail machine strips attachments. Can you E-Mail this directly to me? Thanks Joe wb9sbd n...@mwt.ne On 4/1/2021 1:37 PM, donov...@erols.com wrote: > > Rob Sherwood NC0B agreed to freely share his full transmitted > composite noise measurements (dBc/Hz). Rob's measurements are > limited to only transceivers he has access to. He'll be pleased to > measure the performance of any transceiver, but of course he needs > access for testing. > > > > Transmitted composite noise is only an issue in your immediate local > area -- such as interference to other hams within several miles if you > want to keep them as friends -- or to other transceivers in your own > station for SO2R, multi-op or Field Day. Transmitted noise can be > controlled by transmitter bandpass filters to reduce noise into > transceivers on other bands but a bandpass filter can't reduce noise > into a transceiver on the same band such as a CW and an SSB station > on the same band during Field Day. > > > Several hams asked about degraded transmitted noise power > when the output power is reduced to drive a modern amplifier. > Rob shared his data -- attached to this email -- for all of transceivers > he has tested for transmitted composite noise at 30 watts output. > Transmitted noise output from some transceivers -- such as the IC-7300 -- > is much worse at reduced output power, most others are degraded > from 3 to 6 dB. > > > K3S transmitted noise with 30 watts output power is increased by > 9 dB at 10 kHz from the transmitter frequency, but noise power > 100 kHz from the transmitting frequency is degraded only 3 dB, > the minimum degradation one would ever expect. > > > The top of the first page is Rob's transmitted composite noise > measurements at 100 watts output power. > > > > The bottom of the first page is composite noise measurements > at 30 watts output power. > > > The second page is six meter tests on the the TS-890S > > > 73 > Frank > W3LPL > > > > > _______________________________________________ > CQ-Contest mailing list > cq-cont...@contesting.com > http://lists.contesting.com/mailman/listinfo/cq-contest > _______________________________________________ CQ-Contest mailing list cq-cont...@contesting.com http://lists.contesting.com/mailman/listinfo/cq-contest ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
