| Index | Thread | Archive | Aug-2000 | Archive | Send |
 |
  |
|
   |
|
  |
|
Good information. I will obtain lengths of alum tips for the C31 and add 3.75" per side. Currently 20 mtrs is resonance at 14.270 fed with pigtails and 1/2" hardline of about 350' at 100' above ground. I would like it to come in at 14.100 and that should make it 1.22:1 at 14.000 and 1.375 at 14.300 according to the curve now. Again thanks and will get back when completed. 73, lynn W4NL At 03:07 PM 08/11/2000 -0000, c penna wrote: >Hi This is the result of my High SWR on 20m CW, I managed to lengthen the >20m DE by a maximum of 1.75" per side at which point I was beginning to run >out of tubing. The new DE length lowered the minimum SWR frequency from 14.3 >to 14.22mhz at a SWR of 1.1:1. On 14.025 the SWR is now 1.7:1 which is just >about tolerable dropping fairly sharply to 1.3:1 @ 14.125mhz. >The DE outer tubing is not really long enough to get the SWR really low for >CW only operation. The manual speaks of making the DE 7.5" longer for single >feedline operation my mine was supplied only capable of the single feedline >length ie 28.5 exposed. I'm sure the DE could really do with being 3" longer >per side for low CW SWR. I also found that the hairpin made virtually no >difference what ever it was set to. >For information my antenna is now at 76ft with no other antennas on the >tower >and is fed via 200ft of Coax and a B1 balun. 73 Clive GM3POI > > > >-------------------------------------------- >Force12Talk mailing list provided as a service by Force 12 Antennas, Inc. >Force 12 Web site: http://www.qth.com/force12 > >Submissions: send to Force12Talk@qth.com >To unsubscribe: send a blank e-mail to Force12Talk-leave@qth.com >Force12Talk Message Archive: http://www.qth.com/force12/list/force12talk >For problems with the list, contact n4zr@qth.com > > -------------------------------------------- Force12Talk mailing list provided as a service by Force 12 Antennas, Inc. Force 12 Web site: http://www.qth.com/force12 Submissions: send to Force12Talk@qth.com To unsubscribe: send a blank e-mail to Force12Talk-leave@qth.com Force12Talk Message Archive: http://www.qth.com/force12/list/force12talk For problems with the list, contact n4zr@qth.com |
This Thread
|
This Author (Aug-2000)
|