Have a look at the schematic of the driven element and the balun.
http://www.ve3sy.com/images/telrex-balun.gif
Is this not a 4 or even 6 to one balun?? I recall using the same 1/2 wave
balun on each end of 2 meter feedlines back in early 60 to go from 300 ohm
twin lead down to 50 ohms antennas. Sort of the reverse here.
Thoughts?
Paul VE3SY
> -----Original Message-----
> From: cq-contest-bounces@contesting.com [mailto:cq-contest-
> bounces@contesting.com] On Behalf Of David Robbins K1TTT
> Sent: Monday, July 02, 2007 5:33 PM
> To: 'Paul Cassel'; cq-contest@contesting.com
> Subject: Re: [CQ-Contest] Seeking mono-band Telrex info
>
> The feed point was 50 ohms in all of them I know of.
>
> Note that the 6 element and longer ones benefit greatly by running them
> through an optimizer like yo. The 6 element 20m improves quite a bit by
> shortening the 3rd director to make it a long boom 5 element, the 8
> element
> ones also optimize down to 5 active elements. I never got much
> improvement
> on the 3 or 4 element ones though. The last long 10m one I played with
> was
> a great 11m antenna by their design, it needed lots of adjustment to be
> decent on 10m.
>
>
> David Robbins K1TTT
> e-mail: mailto:k1ttt@arrl.net
> web: http://www.k1ttt.net
> AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net
>
>
> > -----Original Message-----
> > From: Paul Cassel [mailto:paul@ve3sy.com]
> > Sent: Monday, July 02, 2007 04:10
> > To: k1ttt@arrl.net; cq-contest@contesting.com
> > Cc: 'Paul VE3SY'
> > Subject: RE: [CQ-Contest] Seeking mono-band Telrex info
> >
> > OK - now the lights are starting to come on. I saw the screw holes and
> > thought a previous owner was attempting to secure a better electrical
> > connection. As I indicated - the 5 page manual that I have leaves a
> lot
> > of
> > detail to the imagination.
> >
> > Any idea on the feed impedance of the T match feed?
> >
> > Paul
> >
> > > -----Original Message-----
> > > From: cq-contest-bounces@contesting.com [mailto:cq-contest-
> > > bounces@contesting.com] On Behalf Of David Robbins K1TTT
> > > Sent: Sunday, July 01, 2007 3:02 PM
> > > To: cq-contest@contesting.com
> > > Subject: Re: [CQ-Contest] Seeking mono-band Telrex info
> > >
> > > On telrex the other element joints were usually secured by a screw
> > through
> > > pre-drilled holes so there was only one possible adjustment on the
> > > elements
> > > at the tip.
> > >
> > >
> > > David Robbins K1TTT
> > > e-mail: mailto:k1ttt@arrl.net
> > > web: http://www.k1ttt.net
> > > AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net
> > >
> > >
> > > > -----Original Message-----
> > > > From: cq-contest-bounces@contesting.com [mailto:cq-contest-
> > > > bounces@contesting.com] On Behalf Of Paul Cassel
> > > > Sent: Sunday, July 01, 2007 13:48
> > > > To: cq-contest@contesting.com
> > > > Cc: 'Paul VE3SY'
> > > > Subject: [CQ-Contest] Seeking mono-band Telrex info
> > > >
> > > > I'm in the process of replacing my 3 element Hy-gain mono-banders
> with
> > > the
> > > > 5
> > > > element 15M532 on 15 and 10M5325 on 10. The 20 m is 4 elements
> > however
> > > I
> > > > have no manual and am unsure of the model number.
> > > >
> > > > We have successfully re-assembled the 10 and 15m antennas however
> the
> > > > manual
> > > > only shows measurements for the tip section. Since the 15 and 20 m
> > > models
> > > > have multiple sections in each element, the tip measurements alone
> > does
> > > > not
> > > > make much sense as the other sections have quite a range of overlap.
> > > >
> > > > Does anyone out there have center of boom to tip measurements for
> > these
> > > > antennas? I would also appreciate a copy of the 4 element manual
> for
> > > > same.
> > > >
> > > >
> > > > Thanks everyone
> > > >
> > > > Paul VE3SY
> > > >
> > > >
> > > >
> > > > _______________________________________________
> > > > CQ-Contest mailing list
> > > > CQ-Contest@contesting.com
> > > > http://lists.contesting.com/mailman/listinfo/cq-contest
> > >
> > > _______________________________________________
> > > CQ-Contest mailing list
> > > CQ-Contest@contesting.com
> > > http://lists.contesting.com/mailman/listinfo/cq-contest
>
>
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