San Francisco--Online technology portal CNET announced Tuesday it has formed an alliance with Dallas-based radio broadcasting giant AMFM to create CNET Radio, billed as the nation's first all-tech radio format. The station will launch this month on AMFM's KNEW 910 AM in San Francisco. Plans exist to roll out the format nationally by the end of 2000. CNET, which has produced a regular streaming audio Webcast since 1995, will produce daily tech-focused news radio programming to air during daylight hours. A companion Web site is being created at www.cnetradio.com. CNET Radio will receive cross-promotional support from AMFM's six other Bay Area radio stations.