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Scala CLFM-RX

B

BobOnTheJob

Has anyone ever used one of these for DX purposes? It's an 18 pound 6.5db gain FM Log Periodic. What turned me onto it is seeing one used as a directional FM transmitting antenna. It claims 25db front to back ratio and here's what I saw : The station was transmitting 1000 watts aimed north at roughly 300'. It went north very well as expected. Directly behind it, the stereo light on the car radio was flickering at 3 miles (you could actually see the tower from that spot) & the whole signal was GONE at 10 miles. The specs (which the FCC accept for licensing, therefore they can be considered accurate) show that all directions other than the main lobe and the backside actually exceed 25db of directionality. That's no small feat. A Google search for Scala CLFM-RX will lead to the specs. I'm not sure what it costs, but it's built like a tank & therefore I'm sure it isn't cheap.
 
Not easy to find, but the url for Scala is katherein-scala proceeded and followed by the usual stuff. Go to the FM Broadcast tab, and click log periodic.

Looks like and FM dx'ers dream antenna. Interesting site.
 
I've spec'ed and used both the transmit-rated CLFM and the receive-specified CLFM-RX at FM translators, and both are really exceptional performers, durable and worth the money. They look similar.

The RX, however, costs half as much and is not rated for transmitting at all. Other differences: the CLFM uses beefier construction all-round, and has slightly higher gain. It's rated at 500W input (about 2500W ERP) through a 50 ohm N connector.

The RX often is specified with F connectors, which won't take much power at all. VSWR, reflected power into the transmitter, is said by Scala to be higher than acceptable for transmit purposes. I wouldn't run more than a few watts with this antenna.

CLFM-RX http://www.kathrein-scala.com/catalog/CL-FMRX.pdf
CLFM http://www.kathrein-scala.com/catalog/CL-FM.pdf

I love me some Scala.
 
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