Diamond SD-330

SD330: Screwdriver Antenna

Length:Approx. 1.85m / Weight:Approx. 1.1kg
Frequency:3.5-30MHz / Max. power rating:200W (SSB)
Impedance: 50Ω / SWR:Less than 2.0
Connector:M-P / Type:1/4 wave center loading
Power supply voltage & current:DC 12V 100mA 
Up-down time:aprrox. 50 sec.(3.5→30MHz), aprrox. 20 sec. (7→30MHz)

The Diamond SD-330 is a complete mobiile HF whip that is remotely tuned. Handling up to 200W, the antenna can be accurately tuned to any frequency between 3.5 and 30MHz. That means tha you are guaaranteed a low VSWR no matter where you operate. The base is designed to fit onto an SO-239 socket. Power to control the antenna is taken from the car 12v cigar socket. The required plug together with remote tunung switch is included in the package together with the control cable. The SD-330 employs the "screwdriver" design which uses a single continuously variable inductive colil. No top whip adjustment is needed.

To tune the antenna, you simply press the rocker switch and wait for the signal on the receiver to reach its peak - easily heard - and then fine tune for minimum VSWR.  The time taken to tune from 3.5 to 20MHz is approx 50 - seconfs.

 SEE ALSO - the SDC-1 controller for this antenna