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#21
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Tube and Twin lead Slim Jim
On Jun 2, 4:51*am, Ian Jackson
wrote: In message , Cecil Moore writes JIMMIE wrote: Whats the advantage of the Slim Jim over a plan old J antenna. Apparently, the take-off-angle: http://www.para.org.ph/membersarticl...Slim%20Jim.htm I'm sure that W4RNL did a comparison. It might be in here. http://www.scribd.com/doc/8511817/Some-JPoles-That-I-Have-Known-4 http://www.cebik.com/ If it's not in there somewhere, a Google will be necessary. Essentially, the answer was 'not a lot', except that the Slim Jim version (the one with the folded-over top) had a slightly wider bandwidth / flatter SWR plot. -- Ian |
#22
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Tube and Twin lead Slim Jim
"Sal M. Onella" wrote in message ... "JIMMIE" wrote in message ... snip Dave,That was my thoughts on it also. Two wires very close togethether with in phase and more or less equal currents just adds up to a fatter wire. Not a fatter wire with twice the current? Recall the colinear J-pole, The two currents are stacked and fed in phase by means of the phasing section. Yes, I realize the currents in the Slim Jim would appear to cancel. I'm going to have to build one of these and see what it does. I have a lot of twinlead and I have a precision RF generator. I always wanted my own antenna range; tomorrow's the day. Maybe Tuesday. Hi "Sal" I share your thoughts about a pattern range. I recently talked my buddy into writing a program that plots Elevation Plane patterns of an antenna when scaled to a frequency sent from any Polar Orbiting Satellite. I use it alot using the 137 MHz beacons sent from NOAA satellites. Some HAM satellites could be used. There are also L-band beacons sent from the NOAA satellites. Jerry KD6JDJ |
#23
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Tube and Twin lead Slim Jim
"Jerry" wrote in message ... snip I share your thoughts about a pattern range. I recently talked my buddy into writing a program that plots Elevation Plane patterns of an antenna when scaled to a frequency sent from any Polar Orbiting Satellite. I use it alot using the 137 MHz beacons sent from NOAA satellites. Some HAM satellites could be used. There are also L-band beacons sent from the NOAA satellites. That's an interesting approach. Thanks. |
#24
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Tube and Twin lead Slim Jim
"Sal M. Onella" wrote in message ... "Jerry" wrote in message ... snip I share your thoughts about a pattern range. I recently talked my buddy into writing a program that plots Elevation Plane patterns of an antenna when scaled to a frequency sent from any Polar Orbiting Satellite. I use it alot using the 137 MHz beacons sent from NOAA satellites. Some HAM satellites could be used. There are also L-band beacons sent from the NOAA satellites. That's an interesting approach. Thanks. Hi "Sal" If you ever get involved with that Pattern Range, Patrik Tast publishes information on his program on the web. Everything Patrik does is *hobby related* and available free. Nothing I do is sophisticated or difficult to reproduce or to improve upon. I was using Excel to plot the RSSI level before I asked Patrik to make a program to display the signal strength in polar form. I can get actual patterns that Very closely resemble EZNEC plots. Jerry KD6JDJ |
#25
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Tube and Twin lead Slim Jim
"Jerry" wrote in message ... "Sal M. Onella" wrote in message ... "Jerry" wrote in message ... snip I share your thoughts about a pattern range. I recently talked my buddy into writing a program that plots Elevation Plane patterns of an antenna when scaled to a frequency sent from any Polar Orbiting Satellite. I use it alot using the 137 MHz beacons sent from NOAA satellites. Some HAM satellites could be used. There are also L-band beacons sent from the NOAA satellites. That's an interesting approach. Thanks. Hi "Sal" If you ever get involved with that Pattern Range, Patrik Tast publishes information on his program on the web. Everything Patrik does is *hobby related* and available free. Nothing I do is sophisticated or difficult to reproduce or to improve upon. I was using Excel to plot the RSSI level before I asked Patrik to make a program to display the signal strength in polar form. I can get actual patterns that Very closely resemble EZNEC plots. Thanks. Whatever I set up will probably be for signal strength A/B testing between antennas at a fixed distance. |
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