Stig, I have been very impressed with the Flex-1500s audio system accuracy. Because the direct-conversion signal goes directly into a CODEC to be digitized, there is no string of IF and AF amplifiers to affect the signal. >From the CODEC, the digitized signal goes via USB to the PC at a maximum sample rate of 48,000 samples per second. From the Power SDR application, I then use VAC (Virtual Audio Cables) to distribute the audio to other applications, so again, the frequency response is digital flat from near 0 Hz to almost 24,000 Hz. I just ran a test using PSDRs built-in noise generator and DL4YHFs Spectrum Lab for signal analysis. The software generated white noise traveled across the USB cable, D/A in the CODEC, A/D in the same CODEC, and back across the USB cable. The measured frequency response was flat within ½ Hz form near 0 Hz to almost 24 kHz. I will send the spectrum graph to you directly.
The Flex-1500 used the Texas Instruments TLV320AIC33 CODEC. Here is the datasheet link so you can see all of the specifications: http://focus.ti.com/lit/ds/symlink/tlv320aic33.pdf John Stuart, KM6QX -----Original Message----- From: flexradio-boun...@flex-radio.biz [mailto:flexradio-boun...@flex-radio.biz] On Behalf Of Stig Rasmussen Sent: Monday, August 01, 2011 1:46 AM To: flexradio@flex-radio.biz Subject: [Flexradio] Flex-1500 audio?? Hello, I'm considering buying a Flex-1500, but somebody here has complained about the audio. I don't know if that is a user-problem, newbie that don't know how to configure it right, or if the audio amplifier used in it is bad, or broken.(?) I would require a flat audio curve within the SSB passband I set up. Can I expect that from a Flex-1500? Also on TX? Regards, LA4WAA, Stig _______________________________________________ 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/
