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
