After building/using my two C-Pole array I'm starting to rethink my plan.KF2YN's C-Pole vertical array design calls for dedicated C-Poles (each pruned to have a 25 ohm input impedance) and phasing lines that both transform the antenna impedance to 100 ohms and set the phase delay between the two antennas. On the surface this looks doable but I've a lot of concern about getting the phasing lines right. W8WWV's measurements showed...
Thursday, August 23, 2012
Saturday, August 11, 2012
A Two C-Pole Steerable Array
Yesterday I finally got my two C-Pole phased array up and on the air. In fact, after tuning it a little I easily made two QRP contacts, one with N2UGB in NY and the other with CT4RL/1 in Portugal.My journey from idea to an antenna was based on Chapter 13.3, "A Steerable C-Pole Array" in Brian Cake's book, "Antenna Designer's Notebook". Here...
Sunday, August 5, 2012
dBm Meters using the AD8307 logarithic amplifier
I'm having a go at building a couple of dBm RF Power Meter from AD8307The first is W7ZOI design having found a nice 500uA meter at w/e there is a nice construction website here. Also note W&ZOI own notes on callibration here. There are plenty of variations on this design and the daa sheet and application notes from Analogue Devces are worth a read. Some like this one use an AF amp to provide an audible feedback tooPart of...
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