Tim, How do you do that, ie, save EQ profiles? Actually, the receive bandpass is perfectly flat using DIGU with the receive equalizer "reset" to zero. It's just that on SSB, you need to use it, and it is active on DIGU receive. Transmit is where you really need an equalizer. I measured the power output from 500 Hz to 4 KHz, and the power varies, dropping off at the higher frequencies. Power output was 20 watts (arbitrary) at 500 Hz and down to about 5 watts at 4KHz, or when the power output is 20 watts at 3KHz, it is 45 watts at 500Hz. The transmit equalizer has no effect using DIGU. TX filter set at 400 to 4500 Hz, mode PSK31 on MixW, Drive 100, controlling output with TX gain. With the SDR mode on USB and controlling the output with the Drive control, the level can easily be equalized to 45 watts from 500 to 3500 Hz. So where we need the TX equalizer, it is disabled and where we need the RX equalizer to be disabled, it is active.
73, Chas At 11:26 AM 10/22/2007, you wrote: >Chas, > >I agree that the RX EQ setting should be saved, but save it along with >the TX EQ settings in the TX Profiles. That way you can associate a TX >profile with a particular operating mode rather than being restricted to >just one RX EQ setting for a particular mode of operation. I have >several TX profiles for digital modes and separate RX EQ settings would >be nice. > >Sounds like a great enhancement. > >-Tim > >-----Original Message----- >From: [EMAIL PROTECTED] >[mailto:[EMAIL PROTECTED] On Behalf Of Charles Greene >Sent: Monday, October 22, 2007 10:49 AM >To: FlexRadio@flex-radio.biz >Subject: [Flexradio] Receive Equalizer > >Hi, > >I have been using the receive equalizer to reduce some of the high >frequency audio noise on the SDR-1000 which is particularity annoying >when using NR. The audio noise is a problem only on voice modes such as >SSB. However, when I use digital modes, the audio bandwidth is greater >than for voice, and the equalizer adversely affects the receive audio >bandwidth in the digital programs. I use a bandwidth of 5 KHz on the >SDR-1000 for digital modes, and set MixW so one receive channel is >receiving 0-5KHz and the other 100-3KHz audio, which shows any signal in >the filter bandwidth but gives more resolution in the 0-3KHz range. The >equalizer when set to reduce the HF audio noise in SSB, reduces the gain >on the display above about 2.8KHz, plus it is broadly peaked around >2KHz. Similarly, there is a problem on the sound card RTTY programs >such as MMTTY. > >Any one have the same problem? I plan to submit an enhancement request >to either have a mode specific receive equalizer, or disable the receive >equalizer on the digital modes as the transmit equalizer is disabled. I >think having a separate setting of the equalizer both for receive and >transmit for digital modes is a better choice than disabling it, as the >peak around 2KHz can be easily corrected with the equalizer, giving a >more flat response over the audio bandwidth for both receive and >transmit. > >Chas W1CG > > > >_______________________________________________ >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/
