[Antennas] Multiple dipole spacing

2002年8月13日 14:53:53 -0500

George has the right idea. If 170 feet is more room than you have, you
might want to consider building the DEZ out of 450 ohm ladder line so that
the total length folds back on itself. This takes about half as much room
and works great on all bands. I use such an antenna here which is only
82 feet overall and works great on 75 thru 10 meters, plus MARS frequencies.
My design is discussed on my web site at 
http://home.earthlink.net/~bwild/current.html
At 01:38 PM 8/13/2002, George, W5YR wrote:
>I suggest a 176 ft 40-meter Extended double Zepp. You will get up to 3 dB
>broadside gain on 40 and gain over a dipole on all higher bands. The
>antenna can be tuned from 160 - 10 meters. Droop the ends a little, but the
>length is not all that critical. 170 ft will work just fine.
>>A "resonant" dipole can give problems in tuning since the feedline
>impedance varies over a wider range than that of a non-resonant antenna
>such as the 40 EDZ.The EDZ is also less critical of ladderline length for
>the same reason.
>>73/72/oo, George W5YR - the Yellow Rose of Texas
>Fairview, TX 30 mi NE of Dallas in Collin county EM13qe
>Amateur Radio W5YR, in the 56th year and it just keeps getting better!
>QRP-L 1373 NETXQRP 6 SOC 262 COG 8 FPQRP 404 TEN-X 11771 I-LINK 11735
>Icom IC-756PRO #02121 Kachina 505 DSP #91900556 Icom IC-765 #02437
>>>"Lefczik, Larry D" wrote:
> >
> > My question is:
> > Is it better to use a resonant 80m dipole or a longer dipole if room
> > permits?
> > I have ~170 feet between trees available.
>- - -
>>Your moderator for this list is:
>Larry Wilson KE1HZ [email protected]
>_______________________________________________
>Antennas mailing list
>[email protected]
>http://mailman.qth.net/mailman/listinfo/antennas
>>>---
>Incoming mail is certified Virus Free.
>Checked by AVG anti-virus system (http://www.grisoft.com).
>Version: 6.0.377 / Virus Database: 211 - Release Date: 7/15/2002

Bob Wilder, AF2HD/AFA2HD
6032 Idlemoore Court
Theodore, AL 36582-4036
251-653-5274
http://home.earthlink.net/~bwild
All incoming and outgoing messages
virus checked with AVG version
6.0.377 updated 7/15/2002
Get your FREE copy at
http://www.grisoft.com
---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.377 / Virus Database: 211 - Release Date: 7/15/2002
--- StripMime Report -- processed MIME parts ---
multipart/mixed
 text/plain (text body -- kept)
 text/plain (text body -- kept)
The reason this message is shown is because the post was in HTML
or had an attachment. Attachments are not allowed.
Please post in Plain-Text only.---