Hi. An off-topic information, that is somehow SDR related. I have successfully built a 12kHz downconverter for Icom R(T)X that use a 2nd -and last- IF at 9MHz. The adapter can be used to receive DRM HF broadcasts with commercial HAM rigs/RXs and plugs on the optional filter socket (no soldering required).
Some devices that have optional 9MHz filters are: IC-706/MKii/MKiiG, IC-725/726/728/729, IC-735, IC-R70/71/75 receivers. A first test with a balcony homebrew antenna (http://spazioinwind.libero.it/ik1zyw/temp/IMG_0030.JPG) and an IC706MKiiG allowed me to receive bitXpress banner on 15.896 MHz and listen to Deutsche Welle on 6MHz broadcast band. I used "dream" software that supports DRM reception. The same downconverter can be used with SDRadio (without sideband rejection) in order to accomplish narrowband filtering, or SSB/CW/FM demodulation for some receivers (like IC-725/728 that require an optional unit for FM reception). If there is enough interest I will publish a complete description of this downconverter, including the design involved. - unless I receive an offer to buy the whole project :-) - Greetings, Paolo IK1ZYW -- | QRPp-I #707 + www.paolocravero.tk + I QRP #476 | | SpamAssassin-based email antispam/antivirus solutions | \ Italian/English-to/from-Croatian translations / \ Skype: pcravero / Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/soft_radio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
