EZNEC People: Question

[WA4WAX]

Would someone to be kind enough to simulate this antenna, with some variations:

1) As depicted on 40 and 20

2) On 40 and 20, but with the vertical parts extended to 22 feet, and the horizontal parts shortened in accord.

3) Based on a 65 foot 40 meter dipole, run a simulation with the vertical elements 14 feet long, and the horizontal elements 18.5 feet, on 20, 15, and 10 meters.

Thanks!!

http://n4trb.com/AmateurRadio/RCA_Ham_Tips/issues/rcahamtips1203.pdf

[WA4WAX]

......In each case, bottom horizontal wire 8 feet above ground. 

A detail I forgot to mention.

Thanks!

[KD6VXI]

http://amfone.net/Amforum/index.php?topic=32911.0

I have often wanted to build this antenna, but only had towers and masts to hold it up.

I have a few trees now, may check it out again.


--Shane
KD6VXI

[WA4WAX]

In the situation I mentioned at 3), the antenna would be much smaller.  Good for local on 40, but strong end fire performance on 20......someone simulate the other two bands.

This antenna would be much smaller than the original, and might be a good bet for some.

Use a zepp feeder and a 1:1 current balun.........or a zepp with OWL and a tuna.

:-)

[ka1bwo]

Would someone to be kind enough to simulate this antenna, with some variations:

1) As depicted on 40 and 20

2) On 40 and 20, but with the vertical parts extended to 22 feet, and the horizontal parts shortened in accord.

3) Based on a 65 foot 40 meter dipole, run a simulation with the vertical elements 14 feet long, and the horizontal elements 18.5 feet, on 20, 15, and 10 meters.

Thanks!!

http://n4trb.com/AmateurRadio/RCA_Ham_Tips/issues/rcahamtips1203.pdf

Feed point impedance vs frequency for 40 Meters, bottom wire @20 feet, Vswr circle: 10:1, graph S21.
Bottom wire @ 8 feet,  Feed point Impedance @ 7.2 Mhz: 411+j3551

[WA4WAX]

Thanks!

Is that for 1, 2, or 3?

Do you have EZNEC plots as well?

[ka1bwo]

Thanks!

Is that for 1, 2, or 3?

Do you have EZNEC plots as well?

Here's  1

[ka1bwo]

Thanks!

Is that for 1, 2, or 3?

Do you have EZNEC plots as well?

Here's 1

[ka1bwo]

Thanks!

Is that for 1, 2, or 3?

Do you have EZNEC plots as well?

Here's 1

[ka1bwo]

Matt for condition 2, is each vertical part 11 or 22 feet long?

[WA4WAX]

Joe:

For condition 2, the vertical parts are 22 feet, with the two horizontal parts shortened proportionally.  In other words, each horizontal member is shortened by 10 feet.  I want to see what happens to the pattern on 40, 20, and 15.

Thanks!!!!

[ka1bwo]

Joe:

For condition 2, the vertical parts are 22 feet, with the two horizontal parts shortened proportionally.  In other words, each horizontal member is shortened by 10 feet.  I want to see what happens to the pattern on 40, 20, and 15.

Thanks!!!!

Matt, Condition 2

[ka1bwo]

Joe:

For condition 2, the vertical parts are 22 feet, with the two horizontal parts shortened proportionally.  In other words, each horizontal member is shortened by 10 feet.  I want to see what happens to the pattern on 40, 20, and 15.

Thanks!!!!

Matt, Condition 2

[ka1bwo]

Thanks!

Is that for 1, 2, or 3?

Do you have EZNEC plots as well?

Matt, condition 2

[ka1bwo]

Thanks!

Is that for 1, 2, or 3?

Do you have EZNEC plots as well?

Matt, condition 2

[WA4WAX]

I like it on 40 and 20 meters.  Not so much on 15 meters.

How about 16 foot vertical elements?

Thanks!

[ka1bwo]

I like it on 40 and 20 meters.  Not so much on 15 meters.

How about 16 foot vertical elements?

Thanks!

Matt for 40M and 20M with 16 foot vertical legs:  The radiation patterns looks identical to the 12 foot vertical element model. Only minor gain changes, 40M max gain 1.09 dbi, 20M max gain 6.13 dbi.  For 15M it is different as shown.     

[ka1bwo]

I like it on 40 and 20 meters.  Not so much on 15 meters.

How about 16 foot vertical elements?

Thanks!

VSWR/ Z for 16 foot vertical elements

[WA4WAX]

Joe:

Did you put the 15 meter plots for 22 foot legs up instead of the one for 16 foot legs?

I QSL the other information.  As far as I am concerned, 40 and 20 are the two bands of interest.

Based on all of this, folks on the board can make informed decisions on building one.

Of course, you can make a half sized version, and get good end fire on 20 meters.  I would make the vertical legs about 9 feet for that one.

Thanks!

[ka1bwo]

Joe:

Did you put the 15 meter plots for 22 foot legs up instead of the one for 16 foot legs?

I QSL the other information.  As far as I am concerned, 40 and 20 are the two bands of interest.

Based on all of this, folks on the board can make informed decisions on building one.

Of course, you can make a half sized version, and get good end fire on 20 meters.  I would make the vertical legs about 9 feet for that one.

Thanks!

Sorry Matt  I did up loaded the wrong files. Here are the correct files

[ka1bwo]

Joe:

Did you put the 15 meter plots for 22 foot legs up instead of the one for 16 foot legs?

I QSL the other information.  As far as I am concerned, 40 and 20 are the two bands of interest.

Based on all of this, folks on the board can make informed decisions on building one.

Of course, you can make a half sized version, and get good end fire on 20 meters.  I would make the vertical legs about 9 feet for that one.

Thanks!

Sorry Matt  I did up loaded the wrong files. Here are the correct files

[WA4WAX]

Many thanks again Joe!  I just remembered that 15 meters was not one of the bands for the beast anyway.

With a zepp feeder and a balanced tuna, it would be a great antenna for the money and size.

Speaking of 15 meters.........

Make a 32 x 12 version of it.  Cloud burn on 60 meters, but good end fire on 30 meters, and broad side on 15 meters.  Narrow band digital and CW people might like that one.

:-)

[ka1bwo]

Many thanks again Joe!  I just remembered that 15 meters was not one of the bands for the beast anyway.

With a zepp feeder and a balanced tuna, it would be a great antenna for the money and size.

Speaking of 15 meters.........

Make a 32 x 12 version of it.  Cloud burn on 60 meters, but good end fire on 30 meters, and broad side on 15 meters.  Narrow band digital and CW people might like that one.

:-)

Matt what antenna configuration are you going to use and for which bands?  What  length and type of open wire transmission line?   

[WA4WAX]

Very good Joe!

I am probably going to put up the antenna based on the 80 meter dipole.  So, 16 or 18 feet vertical portions for good end fire on 40 meters.  Broadside on 20 meters should be decent.  10 meters not a priority as I would use a small, dedicated antenna for that band.

Feed: It will be high Z on both 40 and 20.  So, zepp feeder with short at 1/4 or 3/4 wave point.  Tap in above short with 1:1 current balun and coax. Alternatively, tap in end to side with 600 OWL and a tuner.  Zepp feeder will be made out of #14 THHN, with bare wire on the bottom part to facilitate short and tap.

[ka1bwo]

Very good Joe!

I am probably going to put up the antenna based on the 80 meter dipole.  So, 16 or 18 feet vertical portions for good end fire on 40 meters.  Broadside on 20 meters should be decent.  10 meters not a priority as I would use a small, dedicated antenna for that band.

Feed: It will be high Z on both 40 and 20.  So, zepp feeder with short at 1/4 or 3/4 wave point.  Tap in above short with 1:1 current balun and coax. Alternatively, tap in end to side with 600 OWL and a tuner.  Zepp feeder will be made out of #14 THHN, with bare wire on the bottom part to facilitate short and tap.

"Zepp feeder with short at 1/4 or 3/4 wave point"  Do you mean a shorted length of 600 ohm transmission line at either point Matt?  I'm interested in your matching scheme. Can you give me more detail.