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Author Topic: 10 meter Ringo with Antenna Tuner?  (Read 1979 times)
VA3CGT
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Posts: 9




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« on: August 10, 2006, 07:57:55 AM »

What kind of results would I expect if I use a 10 meter 1/2 wave Ringo Ranger with an antenna tuner for the rest of the HF bands?
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WB2WIK
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Posts: 20603




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« Reply #1 on: August 10, 2006, 09:21:49 AM »

Might work on 12m.

Shouldn't work at all on 15m, 17m, 20m, 30m, 40m, 80m or 160m.

The Ringo is a 1/2-wave end-fed design with a shorted-to-ground matching transformer at its feedpoint.  That provides a 50 Ohm "tap point" at 28-29 MHz, but looks like a short circuit at lower frequencies.  No amount of "tuning" in the world will remove that short circuit.

Just simply an unsuitable design for multiband use.

WB2WIK/6
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VA3CGT
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Posts: 9




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« Reply #2 on: August 10, 2006, 09:52:35 AM »

Oh well.  I would assume that it will receive the shortwave broadcast bands without any problem.
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WB6BYU
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Posts: 13287




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« Reply #3 on: August 10, 2006, 11:14:36 AM »

It may receive them, but likely not very well.  The input
circuit of the 10m Ringo will look like a short circuit
on most bands below about 15m, so signals likely won't be
as strong as they would be on the antenna itself without
the matching section.

I have a 10m Ringo and am considering adapting it for
multi-band use, but it will require removing the ring and
replacing it with a different matching method.
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VA3CGT
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Posts: 9




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« Reply #4 on: August 11, 2006, 05:27:11 AM »

Interesting!  I would imagine that once the ring is removed a tuner would then be able to tune up on most bands but I wonder how effective the antenna would actually be?  A tuner will tune up a 102" whip in most cases
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AA4PB
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Posts: 12854




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« Reply #5 on: August 11, 2006, 07:25:32 AM »

True, you could remove the ring and simply use it as a vertical whip. However, you would want to locate the tuner right at the base of the antenna. At lower frequencies the feed impedance will be very high and the loss will be terrible if you try to feed it with 50 feet of 50-ohm coax cable. You will also need a good radial or counterpoise system to use the antenna in this fashion.

With the ring in place, the ring will short out most of the received signals outside of the 10 meter band. The farther you are from 10 meters, the lower the received signals will be.
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WB6BYU
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Posts: 13287




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« Reply #6 on: August 11, 2006, 10:25:59 AM »

The ring is tuned to resonance on 10m by the capacitance
between the bottom of the radiator and the mast mounting
bracket, so the tuner settings will have to take this
into account.

My original idea was to remove the ring (which is cracked
anyway) and mount a dual-band tuner for 10 and 20m at the
feedpoint.  I've used this approach before on 40/80 and
30/40m and it works well.  This would give me a quarter
wave vertical for 20m, which certainly would need radials
for efficient operation.

Now I'm thinking I might want to use it as a portable
whip for 40 or 30m, so my plan is to make some sort of
plug-in matching networks at the feedpoint that I can
customize for whatever bands I want.

The point of this for your use is that, without the coil
at the base, the antenna will only have a low SWR on 20m,
and will require a set of radials to work efficiently
on that band.  You can probably press it into service
on 30 through 15m with a tuner in the shack if you use
good coax, but the SWR on 10m will be very high and I
don't expect it to work well.  For SWL use this is
probably a better approach than using the stock antenna
though.
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