http://elecraft.85.s1.nabble.com/OT-G5RV-antenna-baluns-tp447606p447617.html
A friend's coax-fed G5RV worked ok with his 990 (built-in matching unit).
No external "tuner" needed. It worked all bands 160 to 10m: on 160 I made
him a simple switch to short the coax and tune/match against ground. His
needs were modest - no dx, just local chit chat. It was sensitive to coax
line. He replaced it with an expensive Carolina Windom which worked just as
> What many do is put up as much wire as possible, then
> take the feedline down to a remote balanced tuner in a dog house,
> then run coax or hardline to the shack.
> That is the best setup for high power AM multi band work
> I suspect.
> Running AM, you have to derate everything like baluns and traps
> to 1/4 power or less.
> I once had a B+W folded all band dipole rated at 1.5kw that
> B+W told me was only good for about 150 watts of AM!
>
> I used to have resonant 80 and 40 meter dipoles, but the 80
> meter one was directly over the house lengthwise and
> got into everything. When the coax went bad, I took it and the 40
> meter dipole down and put up various antenna's, and the best working
> thing I can fit was the home made G5RV.
> On high power, it works on 80 and 40 meters without anything getting
> hot (coax, tuner), and works great on 40, on 80 I have to watch
> the power as the tuner arcs on the upper frequencies.
> That took some experimenting with lengths to move the high
> voltage point away from the tuner some.
>
> There are lots more choices when running ssb or cw, traps,
> baluns, and auto antenna tuners can all handle those modes.
> Not sure about the digital stuff, but part of the AM problem
> is the very high short duration peaks that can sneak past
> any limiting, 3 or 4 kw in my case, which can be very high voltage
> at a high swr.
>
> The big advantage of the G5RV is that if done right, the swr
> is not real horrible on most bands, and loss is not real high
> in the coax if its short.
>
> A good trap dipole might be better if you run lower power,
> but the G5RV has nothing to wear out or get water/bugs into,
> is light and easy to put up, and easy to make.
>
>
>
> Brett
> N2DTS
>
>
>
>
>
>
>
>
>>
>> > I have G5RV's original article introducing the antenna.
>> > He specifically states that it is a 20M antenna, and yet it's
>> > now somehow become a do-all-bands wonder ... an almost
>> > "cult" thing.
>>
>> In all the G5RV articles I've read, including the original,
>> it's a multiband
>> antenna. It was specifically designed that way by G5RV.
>>
>> What's special about the G5RV is that if it is properly built
>> and installed,
>> it will present a low (but not 1:1) SWR and good efficiency
>> on the non-WARC
>> bands.
>> And it's simple.
>>
>>
>> > The same thing happened with the single-wire fed
>> > Windom years ago. EVERYONE had them.
>> >
>>
>> That antenna goes back to the 1920s. The "Windoms" we have
>> today are really
>> off-center-fed (OCF) dipoles.
>>
>>
>> > Why would one want to clobber up an open-wire fed dipole?
>> > The G5RV version requires a tuner when used on bands other
>> > than 20M, so why not bring the open-wire to the tuner and
>> > dispense with the open-wire-to-coax transition kludge hanging
>> > outside in the sky? It's a simple application made difficult.
>>
>> No, it isn't.
>>
>> The reason for the popularity of G5RVs and OCFs is this:
>>
>> Properly made and installed, they are capable of low SWR (not
>> unity) on
>> multiple bands, and they wind up with a coax feeder of random
>> length coming into
>> the shack.
>>
>> While a tuner may be needed to get 1:1 SWR at the rig, the
>> tuner need not be
>> balanced, nor does it need to have a wide matching range. A
>> simple, low cost
>> tuner can do the job of tuning out the relatively-small mismatch.
>>
>> OTOH, if you simply put up the classic
>> dipole-fed-with-ladder-line and don't
>> concern yourself too much with lengths of dipole and feeder,
>> the result can be
>> a wide range of impedances at the shack end of the line. So
>> you need a much
>> more expensive tuner to get the system to work efficiently.
>>
>> All three systems will work well if done right. After all,
>> they're all just
>> dipoles with different feed systems. The question is, what
>> resources are
>> available?
>>
>> 73 de Jim, N2EY
>>
>>
>>
>>
>>
>> **************************************
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