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Re: Topband: 160 meter current-fed T antenna, where did I go wrong?

To: Mike Waters W0BTU <>
Subject: Re: Topband: 160 meter current-fed T antenna, where did I go wrong?
From: Trent Fleming <>
Date: Thu, 11 Nov 2010 11:27:53 -0600
List-post: <">>
doing my best to improve my 160 capabilities on a small suburban lot.  Only
have G5RV up at this point, flat-topped, at about 30'  Runs mostly N-S.  I
have added connectors to allow me to make it a "T" as follows:

1) Short stub of coax that connects to the SO-239 at the end of the G5's
ladder line with PL-259.  Other end has braid and center conductor twisted
together.  I feed that to the center conductor of another stub (from DX
2) The ground conductor of the DXe stub connects to a DX engineering radial
plate.  This is all at the base of the antenna.
3) I ran two long radials, one north and the other south, pretty much under
the flat-top portion of the G5, each about 50' long

I am already hearing better on 160, but my signal reports have been dismal.
My MFJ-969 usually tunes the G5RV well across all bands, but tuning this "T"
effort on 80 and 160 does not achieve a 1:1 SWR at all.

Running 100w from Kenwood TS-690s.

I KNOW this is not optimal, but trying to do the best I can at this stage.
Only other real option is to run a low horizontal loop around my property .
. .

All comments welcome.


(EM55 near Memphis, TN)

On Sun, Nov 7, 2010 at 7:26 PM, Mike Waters W0BTU

> Hi Mark,
> N6LF recently found that the optimum radial length depends on how many
> radials
> you lay down. Check this out:
>  73,
> Mike Waters
> ________________________________
> From: Mark Lunday <>
> To: Mark Lunday <>;
> Sent: Sun, November 7, 2010 1:38:20 PM
> Subject: Re: Topband: 160 meter current-fed T antenna, where did I go
> wrong?
> Thanks very much to so many fellow hams who responded to my original post!
> Nice to know the fraternity continues to help those with questions.
> This afternoon, a lovely fall day in North Carolina, I abandoned the
> voltage
> T and decided to "man up" and put down 6 x 120 foot radials for the 160
> meter 1/4 wave inverted L which I had given up hoping for.  I already have
> 6
> x 32 foot and 4 x 64 foot on the inverted L.
> RF coming back into the shack has been greatly reduced.  Remote tuner
> working just fine.  Looks like I am headed in the right direction.  So far
> that makes 2 wavelengths of radial wire down.  Probably need another
> wavelength.
> Will listen tonight to see how things go.  Anyone know where we are in the
> "27 day solar rotation" which seems to affect 160 meters?  Are we miday
> through, nearing good conditions, nearing poor conditions, etc?  Thanks
> Mark Lunday
> _______________________________________________
> UR RST IS ... ... ..9 QSB QSB - hw? BK
> _______________________________________________
> UR RST IS ... ... ..9 QSB QSB - hw? BK

Trent Fleming

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