The Cobra Ultralite Sr. will go to 160. I ran my heathkit SB200 in to that
antenna with a good 600 or more watts and it worked fine. It's rated for
1000 watts, but I do know people who run 1500 in to it with no problem so
your 700 should be no problem for it at all. The antenna has ladder line,
you can cut it somewhat or whatever you need to do. I ran RG8X on my g5RV I
had before that antenna with the amp as and it handled the power. You may
want to run something better but I don't think it's a big deal at 700 watts
honestly, it's not like the coax ever got warm, and I never had any RFI
issue. I did change it to RG-213 eventually but I didn't notice any real
difference on the bands I ran it on in performance and it didn't hurt
anything. I wouldn't run legal limit in RG8X but 600-700 watts, I don't see
a problem but if you're starting over, you might want to spring for the
RG213.
----- Original Message -----
From: "tom behler" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Sunday, July 18, 2010 3:27 PM
Subject: Need some input on HF wire antennas for the Michigan house
> Hi, all.
>
> Well, I have been bending the ear of Kevin (K7RX) off list on this topic,
> and thought I'd seek input from others here on the list about an antenna
> dilemma I'm having when considering the best HF antenna arrangements for
> the
> Michigan house.
>
> Here's what I'm thinking, in general, but I need some help with specifics.
>
> When I moved to Colorado last July, I donated my tower, triband, beam,
> etc.,
> to an EOC one county to my north, so I will be without a tower. In
> considering various options, I feel that my best arrangement for HF would
> be
> wire antennas of some sort. Keep in mind that I need antennas that will
> accommodate 600 or 700 watts, due to my recently-purchased Ameritron
> AL811H
> amplifier.
>
> I do not necessarily have a problem with room on the Michigan property,
> although coming up with adequate antenna supports might be a slight issue,
> though ultimately solvable.
>
> What I'm thinking is this: I'd like to have two dipoles, arranged
> perpendicular to each other, so as to cover as many directions as
> possible.
> My TS480, and my Tentec 238A manual tuner both have antenna switching
> capability, so switching between antennas will not be a problem.
>
> One of the dipoles that I'll use, of course, will be my trusty Alpha Delta
> DXCC, which I had up here in Colorado, and used regularly for the
> Cross-country blind ops net.
>
> I am trying to decide what to do for the other wire antenna. I thought I
> had a line on a Carolina Windom, but that seems like it will not work now,
> since the ham who was going to work a deal with me has gone to Florida for
> an indefinite period of time. I could get another Alpha Delta DXCC, but
> would like to try something that might get me on 160 meters if possible.
>
> Some folks on this list have discussed the Cobra lite series of antennas,
> and I might consider that as a possibility. Do those antennas cover 160,
> and can they handle 600 or 700 watts?
>
> Also, I have a question about coax.
>
> In Colorado, I fed my Alpha Delta DXCC with RG8X coax, and didn't seem to
> have any adverse effects when running more power with the Ameritron amp.
> Some have told me that this is not a wise thing to do, and that I should
> consider bigger coax, like RG213.
>
> Does anyone have any thoughts on this question as well?
>
> I know this is a lot for one e-mail, so I appreciate everyone's patience
> in
> wading through it.
>
> I'd like to place an order soon for what I need, so the stuff will be
> available in Michigan, once we are back there for good next week at this
> time.
>
> 73 from Tom Behler: KB8TYJ, still in Colorado, but only for a few more
> days
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