[digitalradio] Direct driving IF
Is there any radio that has a way to directly drive the IF signal? And can a regular sound card be able to directly drive the IF signal? Jerry -- KF5ADY
Re: [digitalradio] Direct driving IF
The FlexRadio products are driven from a sound card. This uses a low frequency IF and quadrature mixing for image rejection. The HPSDR from TAPR converts directly to and from RF using a high-speed DAC and ADC. At this point it produces only a few milliwatts and needs an external power amlifier. I haven't seen any other COTS transceivers with an IF input. Some of the Icom and AOR receivers have a 10.7 MHz IF output. F4DAN (http://f4dan.free.fr/sdr_eng.html) has a list of SDR projects. In my own case, I can tap into the IF of my home-made transceivers so I've been working on FPGA-based IF modems. See the TAPR newsletter and QEX for a partial description. 73, John KD6OZH - Original Message - From: Jerry Maine To: digitalradio@yahoogroups.com Sent: Tuesday, April 14, 2009 02:35 UTC Subject: [digitalradio] Direct driving IF Is there any radio that has a way to directly drive the IF signal? And can a regular sound card be able to directly drive the IF signal? Jerry -- KF5ADY
Re: [digitalradio] Direct driving IF
Hello Jerry, In the last version of Multipsk (4.13), there is a SdR interface which can RX/TX all transmissions between -24 to 24 KHz for a standard sound card and up to +/- 92 KHz for some hight quality sound cards. So you can drive the IF signal from Multipsk (for digital modes). 73 Patrick - Original Message - From: Jerry Maine crashfou...@gmail.com To: digitalradio@yahoogroups.com Sent: Tuesday, April 14, 2009 4:35 AM Subject: [digitalradio] Direct driving IF Is there any radio that has a way to directly drive the IF signal? And can a regular sound card be able to directly drive the IF signal? Jerry -- KF5ADY Announce your digital presence via our Interactive Sked Pages at http://www.obriensweb.com/sked Recommended digital mode software: Winwarbler, FLDIGI, DM780, or Multipsk Logging Software: DXKeeper or Ham Radio Deluxe. Yahoo! Groups Links
