[Antennas] VSWR on Log Periodic.
Danny
[email protected]
2002年4月25日 17:23:26 +0200
Here's some great info about LPDA's.
http://www.cebik.com/3lpda.html
At the bottom of the page is a 12 element 32' boom LPDA.
Avg gain is close 7.3 dBi.
Therefor I guess a T8 has ~ 6 dBi avg gain , don't know if anyone
modeled a T8 before but 5.8 dBd seems kinda high.
The Force12 XR5 has about the same gain , but costs a bit more.
Would like to try one of them Tennadyne's one day .
Hope this link is useful to someone .
73 Danny ON7NQ
[email protected]
http://users.pandora.be/ON7NQ
----- Original Message -----
From: "Dave Shrader" <[email protected]>
To: "George, W5YR" <[email protected]>
Cc: "antennas" <[email protected]>
Sent: Thursday, April 25, 2002 2:16 PM
Subject: Re: [Antennas] VSWR on Log Periodic.
> George,
>> It is a broadband 5 band high efficiency antenna with moderate gain [5.8
> dBd}] and fair to VG F/B. It offers a 5 band solution with gain at less
> cost than than 5 monobanders, or a tribander with add on dipoles, or
> competitive or a tribander with add on elements.
>> It my opinion it is the most economical solution to a 5 band [20 - 10]
> gain antenna. Gain is basically constant and at high efficiency.
>> The ARRL Antenna Book provides an excellent discussion of LP
> performance.
>> Dave, W1MCE
>>>> "George, W5YR" wrote:
> >
> > Dave, the SWR array is impressive, but how do relate this characteristic
of
> > the antenna to the various aspects of its performance? The low and
> > reasonably constant SWR translates into convenience is using the antenna
> > over a number of bands, but does it predict or relate to any
particularly
> > beneficial performance attributes?
> >
> > Not trying to yank your chain, because this is interesting data, but I
am
> > trying to understand your emphasis on this aspect of the antenna system.
> > What should we read into this data?
> >
> > 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
> >
> > Dave Shrader wrote:
> > >
> > > I have an 8 element LP [Tennadyne T8] at 40 feet on Rohn 25 over New
> > > England soil. Tonight temp is 45F, Humidity is 50%, soil is average
New
> > > England with grass growing without irrigation. It slopes off by 10
feet
> > > to the north.
> > >
> > > I made some claims regarding VSWR from 13 MHz to 33 MHZ. Attached are
> > > the actual readings at my location using both the VSWR meter in ICOM
746
> > > and a Daiwa CN 101L
> > - - -
> >
> > Your moderator for this list is:
> > Larry Wilson KE1HZ [email protected]
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>> Your moderator for this list is:
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