Yes, I think it can get to the point where its important, say if you run 700 watts of carrier power and make long transmissions....
Now open wire line does not have that problem, but you need a balanced tuner. Shielding a balanced tuner that is good for 700 watts of carrier, and making it easy to jump between 160 and 10 meters seems a bit tough to do. Using an unbalanced tuner on a non resonant antenna at high power does not seem to work very well, the tuner might be fine, but losses in the coax are high, in other places you might be at a high voltage point and have arcing the tuner. That is why I might try the alpha delta, its not going to work great on 160, only fair on 80, but it should be able to be made resonant enough to allow a tuner or no tuner operation. At least, that is what THEY say... Brett N2DTS > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Craig Carter > Sent: Monday, December 11, 2006 1:36 PM > To: Discussion of AM Radio in the Amateur Service > Subject: RE: Re: [AMRadio] Antenna's.. > > Hi Brett, > > OK, I've never run one before, this is my first 'multi' band. > But I'll clue > you on what I found... I've got one half of the dipole at > about level. The > other side drops down... not like an inverted V, but a slight > slope. The > slope side also has a slight dogleg. The entire antenna is > more of an L > than a dipole, and I think it ended up at about 123' 9". It > is made with > insulated stranded #14 copper clad steel wire. (no > stretching) Since I knew > it would be WAY out of resonance, I used real porcelain end > insulators and > a one foot glass insulator in the middle. I didn't want to be > melting any > insulators while on AM. > > I use RG 8 coax. On AM, if I use one of my Apache's or a > DX-100 there are > no coax cooking or heating problems. I am nearly finished > restoring a home > brew 813 modulated by a pair of 811's. While doing full power > on the air > tests the coax gets warm on the bands above 40 meters --- > that's not good. > But I don't have time to do anything about it yet. I imagine > I'll have to > switch the garage shack (where the home brew is) to open > wire feeder, but??? > > My modern rigs, Icom's, or vintage SSB gear doesn't even > begin to heat up > the coax on SSB or CW, even if I use my ancient Warrior amp. > I've never > checked it on PSK, but I doubt it would get hot. > > I use the 2060 and have to admit, it's a great tuner. It is > kind of a pain > having another stage to tune, but the antenna sure works great for > everything from chewin the rag local on 75 and 160 to DX. > > 73 & Merry Christmas > > Craig K6QI > > > > At 05:40 AM 12/11/2006, you wrote: > >Craig, > >Thanks for the info. > >What power do you run? > > > >I might be able to get 110 feet, maybe a little more > >if I put the wire in the tree branches...insulated wire? > > > >I have found that the RG214 coax can get real hot if I run > >into an antenna that is not resonant... > > > >I have the heath 2060a, although I hate to use it. > > > >Brett > >N2DTS > > > > > -----Original Message----- > > > From: [EMAIL PROTECTED] > > > [mailto:[EMAIL PROTECTED] On Behalf Of Craig Carter > > > Sent: Friday, December 08, 2006 11:33 PM > > > To: Discussion of AM Radio in the Amateur Service > > > Subject: RE: Re: [AMRadio] Antenna's.. > > > > > > I had one of the Alpha Delta 40 & 80 and a multi band Alpha > > > Delta dipoles. With a tuner, the multi band was one of the > > > best dummy loads I've ever had. The 80 / 40 trapless dipole > > > was 'eh' on 80, ok on 40. I now have a 125' dipole, bent all > > > over he!! and gone, and a Heath SA 2060 tuner with RG 8. > > > Works great on every band I try it on, including 6 and 2! I > > > would put up the longest wire I could fit, get a BAT (big > > > 'butted' tuner) and have fun. 73 Craig K6QI > > > > > > >______________________________________________________________ > >AMRadio mailing list > >List Home: http://mailman.qth.net/mailman/listinfo/amradio > >Partner Website: http://www.amfone.net > >Help: http://mailman.qth.net/mmfaq.html > >Post: mailto:AMRadio@mailman.qth.net > > ______________________________________________________________ > AMRadio mailing list > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Partner Website: http://www.amfone.net > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:AMRadio@mailman.qth.net > ______________________________________________________________ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net
