View Full Version : dipole 160 m
kg6nzq
12-03-2003, 02:02 AM
how mant watts does it require to talk on 160 meters? Also, what are the watts required for power supply? 30 or 50 watts?
W5ALT
12-12-2003, 05:28 PM
How many watts depends on where you are, where you want to talk to, the antennas in use on both ends, and the band conditions and QRN levels. Normally, 100 watts and a decent antenna will work the world, with patience.
As far as deciding on a power supply, whatever rig you choose should specify the minimum requirements. Most will be 12 volts (nominal) and the parameter to look at would be current capacity. Your rig manual should tell you the minimum for that.
To get a estimate, take your rig output rating, say 100 watts, and figure 40-50% efficiency as a rule of thumb, so you need at least 200-250 watts worth of power supply. Divide the power by the voltage and you get the current rating needed. In the example, 200/12 = 16.7 and 250/12 = 20.8 amps. Generally a 20 amp nominal supply will handle most 100 watt rigs, but check the rig specs.
73,
Working 160 Meters is a challenge for many of us with small lots.
But to answer your question. You can do quite well at the basic 100 watt level, less even.
160 is a really fun band and I have enjoyed it with a 60 ft sloper (no radials). I have never run more then 500 Watts.
As to the power supply, like already suggested, check the transceiver spec section of the manual it will tell you what current requirement is needed to operate the transceiver during transmit (note the current values differ from receive to transmit). Make sure you read the transmit current requirements.
Get yourself a power supply that will do slightly better then the transceiver requirement (i.e. if the radio requires 10 amps on key down transmit, then look for a power supply that is rated for 15 amps continous; reduces heat and the stress on the power supply transformer).
Keep in mind that the current is also related to key down (that is, CW, continuous). Don't know what you plan to operate (mode) but I would certainly set things up based upon worst case scenarios.
GL and welcome to the hobby! Keep in mind, as mentioned, Technician class CANNOT transmit on 160 meters.