Press Wireless PW15 Transmitters
The Press Wireless PW15 transmitter was once the workhorse of the point to point service operated by Press Wireless and, later, Globe Wireless after they absorbed PreWi. They are of 1940s vinage and saw heavy service during WWII. A dozen PW15 were in service at the Globe Wireless transmitter site in Palo Alto, CA, south of San Francisco. Some were converted to CW service and were in service on the "last day" of commercial Morse in the US when KPH, KFS, WNU and KLB closed Morse service on 12 July 1999. See the Incredible Radio Tales section of this Web site for what it was like on that last day.
The MRHS recovered two of these magnificent transmitters from Palo Alto and transported them to the Bolinas transmitter site. One has been completely restored and operates as the KSM 12Mc transmitter for special occasions. We believe this must be the last operating PW15 in the world. The PW15 other awaits restoration.
Here's the photo story of the transport of these two transmitters to Bolinas.
See a video of the PW15 being brought on line on the MRHS YouTube site at: