John, Gerald and All, John is right about the commercial broadcast like frequency response of the SDR-1000 transmitter.
Instead of John's statement about the traditional amateur radios, I would like to say that in their frequency response basses are already somewhat attenuated, which means that the higher frequencies are pre-emphasized up to a certain corner frequency, beyond which the frequency response goes down rapidly. That will add the audio punch, which I like. I sincerely believe that this is also the explanation what Stig was asking for. Another additional property of the SDR-1000 decreasing the "punch", is obviously the accurate "feed forward" control of the peak power that prevents transmitting signal going to the clipping level. As you know, software defined radios can be put to different tasks. To me it is mostly a measurement instrument like a spectrum analyzer and an excellen receiver - especially having now the Janus/Ozy connected to the radio. Sometimes I would like to use it also as an efficient ham band transmitter, but according to my (not so humble) opinion Flex has so far almost completely ignored the needs of serious DX hunters by delaying the introduction of a multichannel equalizer combined to a feed forward compressor that was already started almost four years ago by the initiation of Phil Harman. I think, it is a shame, if Flex-5000 will be entered to the marketplace without at least a promise of a quick update to this optional feature. My very best regards to all and especially to Gerald, Ahti OH2RZ On 04/06/07, John P Basilotto W5GI <[EMAIL PROTECTED]> wrote: > It simply is in the adjustments. Traditional amateur radios have > pre-emphasis in the audio, i.e there is a certain amount of bass already > there. The SDR1K is flat as a pancake. When you add bass, either externally > or with the built-in EQ, you are simply adding pre-emphasis. > > The SDR1k was designed to be flat just like a commercial broadcast > transmitter. > > John P. Basilotto > W5GI > Marketing and Product Manager > FlexRadio Systems > 512-535-5266 > > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Stig Rasmussen > Sent: Monday, June 04, 2007 1:28 PM > To: Ahti Aintila; Dale Boresz > Cc: flexradio@flex-radio.biz > Subject: Re: [Flexradio] audio punch > > Hello, please stop this. :-) > I dont want any discussion around ESSB / and or DX-pileups modulation. Whats > best etc. > My point is only to state the fact that SDR-1000 handle bass-less modulation > much > less punchy than other traditional transceivers, f.example my TS-870 or > IC-746PRO. > Same power-meter used. Thats it! If there is an explanation I would like to > hear... > > Stig > > -----Opprinnelig melding----- > Fra: Ahti Aintila [mailto:[EMAIL PROTECTED] > Sendt: 4. juni 2007 10:26 > Til: Dale Boresz > Kopi: Jim McLester; flexradio@flex-radio.biz; Stig Rasmussen > Emne: Re: [Flexradio] audio punch > > > Stig and Jim, > > Dale is telling the plain truth, if your main interest is getting your > signal through in noisy conditions and DX pileups. The basses convey > very little speach information, but eat up the limited power of your > transmitter. Unless you want to broadcast a Hi-Fi music program on ham > bands use a good quality multi-channel equalizer to attenuate the > lower frequencies of your modulation. And if you want real information > carrying audio punch, you may use a PROPERLY MADE compressor or even > RF clipper. However, never use compressors and/or clippers, if the the > basses are not attenuated. > > Almost four years' time already I have tried to convince our Flex > software wizards and gurus to implement an integrated audio processor > that would enhance the speech signal intelligibility in noise at least > as well as explained in the following "ancient" articles. Sorry for > this repeated use of the bandwidth, but please, please, read carefully > and understand these: > http://kotisivu.dnainternet.net/ahti/sdr-1000/filtclip.pdf > http://kotisivu.dnainternet.net/ahti/sdr-1000/speechproc.pdf > > My understanding is that these functions can be implemented by the DSP > means much more elegantly than 30 years ago by the hardware means. I > sincerely hope that some of our software experts would take my request > seriously. > > 73, Ahti OH2RZ > > > > > > __________ NOD32 2305 (20070601) Information __________ > > This message was checked by NOD32 antivirus system. > http://www.eset.com > > > > _______________________________________________ > FlexRadio mailing list > FlexRadio@flex-radio.biz > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ > FlexRadio Knowledge Base: http://kb.flex-radio.com/ > FlexRadio Homepage: http://www.flex-radio.com/ > > > _______________________________________________ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
