Hi I'm new to the list and run an AV640 with its base about 18' above the ground. Has anybody modeled this or a similar 3/8 WL loaded vertical, like the R8, regarding efficiency, radiation pattern, e
Hi All, I have an AV640 vertical from Hy-Gain, which is about 18' off the ground at the feed point. Overall I have been satisfied with its performance, which has generally met or exceeded (apparently
I agree regarding the months/years/never for coax to dry. Now the coax never sat outside on the ground, etc, or was out there without its connector and unattached to the antenna; likewise, it has b
Follow up thought/question: the Curie Point/Temp is 768 degrees Celsius. Seems that the box would be melting (it's simple plastic) if anything inside reached that kind of temp...or is there more to
Hey Gang, I have a Hy-Gain AV-640 multi-band vertical, which in most respects performs admirably. It is mounted so that the feed is about 18 to 20 feet off the ground. I have had it almost two years
Tom Stone of Hy-Gain wrote me that it did not sound like a heating problem to him; he was thinking moisture in the LMR400 (a nightmare I considered) or the matching unit; or, he said, a bad solder jo
Hey Gang, Some of you have followed my tale regarding the Hy-Gain AV640. Hy-Gain suggested that rather than saturation, it would be moisture in the coax or a bad solder joint on the 40 meter coil.
I live on a fairly small lot and use a Hy-Gain AV640 for 40 through 10 and currently have no antenna for 80 or 160. My backyard is about 90 x 70 but has some ill-placed and ill-shaped trees for eithe
Dave, Thanks for the feedback. You are doing what I thought could be done, but I was not sure how high the inductive reactance would have to be at 3.5 to 4.0 to ?terminate? the antenna at that spot f
Dave, Sounds promising...and making more sense than my idea of using irrigation pipe. First off, since you obviously understand more about this than I do, thank you. Second, you might enjoy this calc
Thanks for the reply Terry. Well I'd wondered about the effect of the losses. I modeled a smaller resistance in the coil, but was doing it incorrectly, based on the wire length and gauge. I know ante
Absolutely agree about the dirt and even on my small lot hope to have at least 3600 feet pushed into the top-rock (we don't have top soil in the Ozarks). Friendly neighbors...so some will go under th