On Thu, Mar 24, 2005 at 07:41:02PM -0800, Tom Watson wrote: | In fiddling with a 72MHz RX in a particular plane (Pike), there were | only two solutions that gave an adequate ground range-check:
A range check where you collapse the TX antenna is hardly a scientific test, but it does catch gross errors (like where you accidently cut the RX antenna wire when you install it!) so it's a good thing. But it should also show just how badly you can hurt your range by simply cutting the antenna. Doing a similar change to your RX antenna length will have a similiar affect on range. | 2. Exactly doubling the antenna length, exiting the fuse halfway down | the boom, taped to the bottom of the boom all the way back, leaving the | excess dangling. Invisible from more than six feet away and glitch-free | ranging to vision limits. Is the fuse made of carbon fiber or covered with something else that conducts? If the antenna is being shielded, then absolutely, anything that gets some of the antenna out of that shielding will improve things, even if it's not quite right. | I had read earlier that as long as one kept the antenna in multiples of | its own length Keeping it a multiple of the antenna length is better than say 1.5 lengths, but as Mike says, it messes up the impedance and will probably reduce range. | it should work. Ultimately, with antennas, just about everything works. It's just that some things work better than others. | [EMAIL PROTECTED] wrote: ... | >I'll bet you were really talking about adding another 1/2 | >wavelength or multiple of that. Adding another 1/4 wavelength would | >create a 1/2 wave end-fed antenna, which would have a much higher | >input impedance. On the other hand, converting a 1/4 wave antenna | >into a 3/4 wave antenna would make sense. Yes you're right. I made a typo. -- Doug McLaren, [EMAIL PROTECTED] All generalizations are dangerous, even this one. --Alexandre Dumas RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from web based email such as Hotmail and AOL are generally NOT in text format
