I would like to see some concrete data on that. If you have a 100 dB radio, how could a preselector give a night and day improvement? That seems on the surface to be illogical. I will have an FTdx-5000D here within 10 days, but I don't think the ham who is loaning it to be purchased the uTune. 73, Rob, NC0B
>>> Edwin Marzan <edwin_mar...@hotmail.com> 11/3/2010 2:07 AM >>> I don't know if the claim from the FT5000 owner is inflated but he swears the difference is night and day. Interesting discussion, thanks... Edwin Marzan AB2VW > Date: Tue, 2 Nov 2010 09:59:05 -0700 > From: brian-wb6...@lloyd.com > To: outposte...@shaw.ca > CC: flexradio@flex-radio.biz > Subject: Re: [Flexradio] The Ultimate Low-Band DXer RF Presel ection Filter: YAESU's Exclusive µ-Tuning > > On Tue, Nov 2, 2010 at 9:45 AM, Jordan <outposte...@shaw.ca> wrote: > > > The issue with the TinyScr preselector, or any other 50 ohm interim device, > > is that it requires a 50 ohm load... The 5000A seldom presents a 50 ohm load > > to the output of the TinyScr, and hence does not always work as it was > > intended.... > > > > Good point. I had forgotten. I swept the input of my 5000 using a VNA and > was quite surprised. > > The solution is to put a 6dB pad between preselector and RX input. That will > allow the preselector to see a good match (50-ohm) without excessive signal > loss. Reducing sensitivity by 6dB is usually not a problem at 160m or 80m. > > -- > Brian Lloyd, WB6RQN/J79BPL > 3191 Western Dr. > Cameron Park, CA 95682 > br...@lloyd.com > +1.767.617.1365 (Dominica) > +1.931.492.6776 (USA) > (+1.931.4.WB6RQN) > _______________________________________________ > FlexRadio Systems Mailing List > FlexRadio@flex-radio.biz > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ > Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/ _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/ -- If this email is spam, report it to https://support.onlymyemail.com/view/report_spam/ODExMjI6MTE3ODc0ODkwNTpyb2JAbmMwYi5jb206ZGVsaXZlcmVk _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/
