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| Oakland Tribune, 18-May-1922 |
We see that San Francisco radio station KPO was supposed to begin broadcasting on 17-April-1922, but I could not find a record of it. This item says that regular broadcasts would begin on 22-May-1922.
The original KPO studios were in the Hale Brothers department store at Fifth and Market. Hale Brothers owned the station. In 1929, the station moved to the Hale Brothers annex, seen behind the corner store. In 1927, the station became an early affiliate of the NBC Red Network. NBC acquired KPO in the 1930s and changed the call letters to KNBC. Later, they wanted to use the call sign for a Los Angeles station and changed the San Francisco station to KNBR.
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| San Francisco Chronicle, 12-May-1922 |
This barely legible item says that KPO was waiting for a more powerful generator that was being shipped from back East. Perhaps that is why the opening was delayed.
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| Oakland Tribune, 22-May-1922 |
This is earliest broadcast schedule that I have found that mentions KPO's call letters.
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