You could do a simple test: With an ohmmeter, on Diode test and with reversed polarity (Red on shield, black on center pin), measure the DC resistance on the RF connector. If it's a short (< 1 ohm) DO NOT APPLY ANY VOLTAGE ON IT! Your antenna is passive and conducting.
If the ohmmeter indicates a diode reading (about 0.7V) the antenna is active and some bias will be required to have the antenna work. If the reading is infinite, it is either a passive (open) or active antenna. To further determine the type of antenna, i suggest you to use some length of coax (20-50ft) cable to put the antenna away from you, and, using a regulated 5 volts power supply with a 1000 ohms SERIES resistor, apply power (forward polarity, e.g. positive on center pin) to the antenna and measure the voltage across the 1000 ohm resistor. If you have some voltage across the resistor, this indicates that the antenna preamplifier draws some current and, obviously, the antenna is active. If no voltage is present across the 1000 ohms resistor, your antenna is passive. Why the 20-50 foot coax? Simply to put some isolation between you and the antenna. If the preamplifier is turned on by the 1000 ohms bias and the antenna is too close from you, the whole thing will start to oscillate. 73 de Normand VE2UM --- Doug Millar <[EMAIL PROTECTED]> wrote: > > Hello, > Hope the New Year is going well. I recently got the > above antenna to > use on another receiver, but no data. Does anyone > have a description > of the interface? Is it just a simple ferrite > antenna, or does it > have a preamp and need bias, or "other" ? Any info > would be very helpful. > Thanks, > Doug K6JEY > > > _______________________________________________ > time-nuts mailing list > [email protected] > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
