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coax) on 10 meters and do not use an LP filter. It was suggested by force 12 that I add about 5 feet of coax. I did that and to my amazement it worked. I have been trying to understand why this would work and have not yet come up with a technical explanation (Force 12 cannot explain it either). With an ideal line, the length of coax should not make a difference on the VSWR seen at the transmitter. It instead would only affect the phase angle from a Smith Chart standpoint. From a real world lossy line standpoint, 5 feet of coax is not long enough to cause any appreciable loss or effect on the VSWR. My first thought was that the force 12 balun was bad as the symptoms suggest that the coax was functioning as part of the antenna. However, I removed the 5 feet of coax, and replaced the balun with a current balun from Hygain. The results were the same as with the force 12 balun... Therefore I have ruled out this possibility. My coax is new, so I am for the time being ruling out this possibility. The antenna seems to work fine on 10 meters, but I am bothered that I do not understand this phenomena. Any ideas? Rick WB4EJC Coconut Creek, Florida > -----Original Message----- > From: Tony [mailto:ad6id@arrl.net] > Sent: Saturday, June 17, 2000 4:47 PM > To: force12talk@qth.com > Subject: Re: [Force 12 Talk] !0 meter VSWR > > > At 01:37 PM 6/17/00 -0400, Natan Huffman wrote: > ...> > >Five out of five installations experiencing this high 10 meter > VSWR problem > >fixed the problem by removing the LP filter! All of the problem filters > >were of the same manufacturer. > > > >So, if you don't think things are quite right on 10 meters, look > at your use > >of a LP filter as a very possible problem initiator. > > Thanks for the great detective work. Could you tell us which > 'same manufacturer? > Or do you suspect that they all have this effect? > > I didn't catch which antenna. I have a C4SXL (without a LP > filter, so far). > > 73, Tony > > Tony Armendariz, AD6ID > ad6id@arrl.net > FISTS 3535 WPSS ARRL > > > -------------------------------------------- > 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 force12@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 force12@qth.com |
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