[Antennas] RE: Antennas Digest, Vol 8, Issue 5
Larry Fields
n6hpx_du1 at hotmail.com
Wed Sep 8 14:43:51 EDT 2004
I been hearing pros and cons on these antennas. I been wanting to buy the
newer models <silver models> as I heard from a overseas friend that they
were terrific antennas for dx. But one store I went to claimed they was no
good an created alot more noise.
Would love to just try one.
Larry Fields,n6hpx/du1
>From: antennas-request at mailman.qth.net
>Reply-To: antennas at mailman.qth.net
>To: antennas at mailman.qth.net
>Subject: Antennas Digest, Vol 8, Issue 5
>Date: Mon, 6 Sep 2004 04:00:33 -0400 (EDT)
>
>Send Antennas mailing list submissions to
> antennas at mailman.qth.net
>
>To subscribe or unsubscribe via the World Wide Web, visit
> http://mailman.qth.net/mailman/listinfo/antennas
>or, via email, send a message with subject or body 'help' to
> antennas-request at mailman.qth.net
>
>You can reach the person managing the list at
> antennas-owner at mailman.qth.net
>
>When replying, please edit your Subject line so it is more specific
>than "Re: Contents of Antennas digest..."
>
>
>Today's Topics:
>
> 1. RE: B&W AC 1.8-30 vs BWD terminated antennas? (Buck)
> 2. RE: B&W AC 1.8-30 vs BWD terminated antennas? (Buck)
>
>
>----------------------------------------------------------------------
>
>Message: 1
>Date: Sun, 5 Sep 2004 23:50:34 -0400
>From: "Buck" <na4fm-list at towncorp.net>
>Subject: RE: [Antennas] B&W AC 1.8-30 vs BWD terminated antennas?
>To: "'Phil Florig'" <W9IXX at arrl.net>, "'Antenna Reflector'"
> <antennas at mailman.qth.net>
>Message-ID: <20040906035333.BBE0D859BF9 at mailman.qth.net>
>Content-Type: text/plain; charset="us-ascii"
>
>A friend of mine who is very active in the club and even more interested in
>antennas than I (That's saying a lot!) received one of the t2fd antennas
>from a ham that thought it sucked. He has been studying the antenna and
>testing it now for about three months. We have discussed it extensively on
>the air. Here are the conclusions I get from it.
>
>The B/W antenna is not exactly the same specs as the original. It is a
>"tilted" dipole and in order to get the proper performance from it, it
>needs
>to be tilted at the correct angle as in the instructions.
>
>When properly installed and carefully compared to a slanted dipole, the
>T2FD
>works almost exactly the same as the dipoles except for two bands, I forget
>if it were the longer two bands or the shorter two. I think it is a little
>lossy on the bands that are longer than the antenna. Regardless, it was
>still effective even then.
>
>The previous owner hung the antenna up like a dipole and had nothing to
>compare it to but his beam.
>
>You can find more information on the internet about the antenna. It's
>proper name is the Terminated Tilted Folded Dipole and is most commonly
>referred to as the T2FD or TTFD. The reviews I read on the internet are
>mixed. There are plenty of folk who really don't like the antenna and
>plenty that praise it.
>
>Remember it's purpose and your purpose for having it. It was made to setup
>quickly and easily and to work instantly. If you are working DX primarily,
>it may not be suitable, but if you can only have one antenna and it fits
>your real estate, then you may have a real winner there.
>
>Wishing you the best.
>
>N4PGW
>73 for now
>Buck
>
>
>-----Original Message-----
>From: Phil Florig [mailto:W9IXX at arrl.net]
>Sent: Sunday, September 05, 2004 9:54 PM
>To: Antenna Reflector
>Subject: Re: [Antennas] B&W AC 1.8-30 vs BWD terminated antennas?
>
>Hi guys,
>
>Thought might make a few comments to maybe clear a few things.
>
>1. The resistor that is in the B&W antenna is not at the feed point,
>it is at the end where the two folded wires return to the center area.
>
>2. I would also be interested in hearing an answer to Jays' question
>but have not seen yet.
>
>3. Was mentioned below that the antenna is less effective than a dipole
>and is not intended for DX work.
>
>4. The prime advantage to the antenna is that it can be instantly switched
>to ANY frequency and still have a less that 2:1 swr. This ant is used on
>ALL frequencies in the range of 3-30MHZ. In MARS and Gov. services we use
>ALE which switches in the millisec range and therefor don't have time
>to use a tuner either auto or manual.
>
>5. I have up a 170ft B&W unit and it does not compare to the inverted V's
>but I know that and don't rely on it for ham work. Sure is a nice idea
>though if you want to change freq rapidly w/o tuning. Be the first there
>when a new spot comes up...... HI......
>
>6. I know some have done research on the ant and LB Cebik has an article
>on this type of antenna. As long as I have this antenna up and working
>if anyone wants any info or testing information I will try to help with
>tests if I can. Have limited equipment and antenna knowledge and that's
>why I think this reflector is great. I have learned a lot here and
>appreciate
>all the input. Keep up the good conversation.
>
>73 Phil W9IXX/AAM4ENC/AAR4XX
>PS: Usual disclaimers apply if required...
>
>
>At 20:36 9/4/2004, you wrote:
> >Has anyone run an efficiency comparison between the Barker and Williamson
> >BWD ninety-foot terminated folded dipole or "T2FD" antenna, versus their
> >similar AC 1.8-30 terminated end-fed vee?
> >
> >A few thoughts:
> >I am guessing that the vee encloses more space and could be more
>efficient
> >in that regard.
> >Both antennas use similar baluns and load resistors.
> >Both are loops if you consider the counterpoise wire in the AC 1.8-30
>going
> >from one leg of the balun to one leg of the resistor.
> >
> >I'm aware that these antennas are a few DB less efficient in the 2 and 4
>MHz
> >bands than
> >a resonant wire- but my application is instant frequency change, NVIS and
> >not QRP or DX.
> >
> >Thanks,
> >Jay
> >AAR9QM/W6CJ
> >
> >
> >
> >- - -
> >
> >Your moderator for this list is:
> >Larry Wilson KE1HZ antennas-owner at mailman.qth.net
> >_______________________________________________
> >Antennas mailing list
> >Antennas at mailman.qth.net
> >http://mailman.qth.net/mailman/listinfo/antennas
>
>-----------------------------------------------
>Philip Florig e-mail:pflorig at ieee.org
>115 Horne Rd. (or):W9IXX at arrl.net
>Columbus, NC. 28722 amateur radio:W9IXX
>USA also:C6AXX-J3X-T30,31,32,33P-VP2MPF
> team member:AH1A-C6DX-J3A-VP2MX
> MARS:AAM4ENC/AAR4XX
>-----------------------------------------------
>IPR Systems, Inc. tel: 1-708-385-7500
>11651 Mayfield Ave. fax: 1-708-385-7515
>Alsip, IL. 60803 email:info at iprsys.com
>USA web:iprsys.com
> INDUSTRIAL POWER SUPPLIES & RECTIFIERS
>-----------------------------------------------
>
>- - -
>
>Your moderator for this list is:
>Larry Wilson KE1HZ antennas-owner at mailman.qth.net
>_______________________________________________
>Antennas mailing list
>Antennas at mailman.qth.net
>http://mailman.qth.net/mailman/listinfo/antennas
>
>
>
>
>
>
>------------------------------
>
>Message: 2
>Date: Sun, 5 Sep 2004 23:57:46 -0400
>From: "Buck" <na4fm-list at towncorp.net>
>Subject: RE: [Antennas] B&W AC 1.8-30 vs BWD terminated antennas?
>To: <antennas at mailman.qth.net>
>Message-ID: <20040906040041.2172C859DC5 at mailman.qth.net>
>Content-Type: text/plain; charset="us-ascii"
>
>BTW, that works! I once had a 100 ohm/300 watt resister. For kicks and
>giggles, I cut wires for an 80 meter dipole, connected them to either end
>of
>the resister like a cobra head and ran coax to the wires. The resistor was
>actually between the shield and center conductor with the wires extending
>outwards. The antenna worked on 80-10. When I checked into the 75 meter
>net, I did not have a great signal, but I was readable. Ten meters was
>open
>and I made several contacts, but when I removed the resistor, the receive
>signal improved incredibly! The SWR was under 3:1, but I don't know by how
>much. I had a tube rig and that was all I worried about. Today, we want
>1.5:1 or better.
>
>BTW, I DON'T recommend that for a QRP antenna unless it is an emergency.
>Then a dipole would be better.
>
>FWIW.
>
>Buck
>N4PGW
>
>
>
>
>-----Original Message-----
>From: William Lambing [mailto:w0lpq9 at msn.com]
><<<SNIP>>>
>
>Having a resistor at the feed point is about like putting a dummy load at
>the end of the feed line and hanging wires out to radiate.
>
>
>
>
>
>
>------------------------------
>
>_______________________________________________
>Antennas mailing list
>Antennas at mailman.qth.net
>http://mailman.qth.net/mailman/listinfo/antennas
>
>
>End of Antennas Digest, Vol 8, Issue 5
>**************************************
_________________________________________________________________
On the road to retirement? Check out MSN Life Events for advice on how to
get there! http://lifeevents.msn.com/category.aspx?cid=Retirement
More information about the Antennas
mailing list