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Tom Bruhns wrote:
So if you have 200 feet of RG-213 and 200 feet of RG-58, put those in series to the cantenna. Coil them loosely and cool them with a fan if needed, if you are running high power (or start the chain with larger coax). . . One thing to keep in mind when you use coax as an attenuator or dummy load is that the portion of the cable nearest the transmitter dissipates most of the power. If you had, say, 6 dB per 100 ft attenuation and a 200 ft cable, the first 50 ft dissipate 1/2 the power (and that's concentrated toward the transmitter end), the next 50 ft dissipate 1/4 the power, the next 50 ft 1/8, and the final 50 ft 1/16. So do as Tom says and put the heavier coax up front, and allow for more air circulation for the coax nearest the transmitter if dissipation becomes a problem. Roy Lewallen, W7EL |
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