Brian's new Antenna

[BriansBrain]

Got Brian a 100W Dominator

I'm fitting it this afternoon

Domitaror+John-2.jpg

[BriansBrain]

It's up

Domitaror-1.jpg

[tokingmenace]

Looks good! Hope you get some good results.

[NTRRadio]

Looks like the same design as the old Sigma IV CB antenna. 7/8 wave?

[BriansBrain]

Looks like the same design as the old Sigma IV CB antenna. 7/8 wave?

I think is it based on the Sigma yes

[rigmo]

The best antenna like two dipole but 7/8 is better..? where you buy? pcs is 3/4

[rigmo]

FM RF antenna Dominator Vector EXTERMINATOR 7/8" & 5/8"AlbumiFM RF antenna Dominator Vector EXTERMINATOR 7/8" & 5/8"
ASTROPLANE best vertical antenna ever? Sirio Vector 4000 avanti sigma 4 lw150 tagra bt-104 7/8" & 1 5/8".

https://www.worldwidedx.com/threads/ast ... 317/page-9

https://www.facebook.com/pg/k19radio/ph ... 0825969282

[tokingmenace]

Looks like the same design as the old Sigma IV CB antenna. 7/8 wave?

Funnily enough I thought the same.

If correct, should work well then

[NTRRadio]

Looks like the same design as the old Sigma IV CB antenna. 7/8 wave?

Funnily enough I thought the same.

If correct, should work well then

The old Sigma IV was a beast. I had one with intention to convert it to 88-108, but I ended up selling it instead.

[BriansBrain]

The best antenna like two dipole but 7/8 is better..? where you buy? pcs is 3/4

It's a real Dominator from the USA

https://fmbroadcastantenna.com/dominator.html

[Electronically]

The best antenna like two dipole but 7/8 is better..? where you buy? pcs is 3/4

It's a real Dominator from the USA

https://fmbroadcastantenna.com/dominator.html

3db that's pretty good for a dominator good choice Brian

Sent from my AMN-LX9 using Tapatalk

[teckniqs]

The best antenna like two dipole but 7/8 is better..? where you buy? pcs is 3/4

It's a real Dominator from the USA

https://fmbroadcastantenna.com/dominator.html

"Max. power: 250 watts, 1KW or 3KW models"

....I thought your one was 100w version? I can't see that on the link posted up for the one you said you're using.

[BriansBrain]

"Max. power: 250 watts, 1KW or 3KW models"

....I thought your one was 100w version? I can't see that on the link posted up for the one you said you're using.

Sorry... it's the 1000W version

[fmuser877]

how many miles does it go?

[rigmo]

how many miles does it go?

depend of to many factors... distance from ground... ground configuration, earth natural disturbance...
but much better then one top quality dipole and also less then 2 way dipoles.
today wee need minimum 2 way or 4 way antenna sistem because rf jam is so high then was 25 years before...

I prefer dominator vector antena because hi get real gain easy to install. one antena like 2 way... but need the higher position... tower etc...

[BriansBrain]

how many miles does it go?

he antenna is at 210m above sea level +/- 150m above average terrain (HAAT)
@ 140W I was getting a good results with the little dipole +/- 5 Miles or 8km

I have only had one report in up to now from Arguineguin with the new antenna...
... he said

very good connection now

.
With the dipole before it was a bit sketchy in Arguineguin.

Brian-Arguineguin-Terrain.jpg

I have not been out with my Pira to do a band scan yet
https://pira.cz/fm_broadcast_analyzer/?art=p275box

South GC Hillshade.jpg

[fmuser877]

I am pretty low down but getting about 8 miles in the car on 7 or 30 watts from my place you must have more hills around

[Albert H]

I always found that a quick twin-stack of dipoles worked well, and gave around 3.2 dBb if matched and assembled correctly. The "Dominator" claims 3 dBd. My ⅞-wave with four ¼-wave radials measures at just over 3.7 dBd, and has a nice low radiation angle - very little signal goes skyward.

Another aerial I've been playing with (at 430 MHz so it's a reasonable size to work on) is the 0.64-wave vertical. The match is tricky, but when it works, it's very useful....

[thewisepranker]

I always found that a quick twin-stack of dipoles worked well, and gave around 3.2 dBb if matched and assembled correctly.

I wouldn't call a correctly assembled and matched double stack, "quick", especially one that gets close to 3.2 dBd!

The last one I built took much, much longer I had anticipated by the time I:

• Messed around trying to find a combination of aluminium box section and brass tube that gave me the impedance match that I wanted. I had to obviously go by commonly available sizes of box section, not listed in inside dimension order (which is all I really cared about) and brass tube listed in different units to the aluminium box section, and not available everywhere easily - this took at least 2 hours of calculation, simulation, compromise and lots of searching around to get right.

• Used a milling machine that didn't have enough axis travel to make a quarter-wave splitter from aluminium box section and brass tube in one setup.

• Built the quarter-wave splitter.

• Checked the matching and tuning of the splitter using a VNA and some 50 Ohm loads from a cal kit and then adjusted as required. Hint: if it's wrong, you've got to start again or magically figure out how to make obround tapped holes.

• Tuned the dipoles. This took about 4 hours.

• Made the three pieces of coax with N connectors and hex crimp ferrules including carefully shrinking glue-filled heatshrink over the crimp sections to make them waterproof. Tip: do not buy anything but Amphenol, Pasternack, etc. (high quality, known-brand) crimp-type N connectors as the crimp ferrules will not be the correct size. They will not work with the supposed correct crimp die size. Time wasted: about 4 hours milling very hard tool steel in order to make my own crimp dies on said milling machine in order to make the ferrules grip the coax.

• Checked the tuning when spaced for optimum gain (about 0.925 wavelengths) and spaced from the mounting pole, and adjusted to suit.

[teckniqs]

"Max. power: 250 watts, 1KW or 3KW models"

....I thought your one was 100w version? I can't see that on the link posted up for the one you said you're using.

Sorry... it's the 1000W version

Ahh OK, nice.

....So in that case if you've got the 1kW version and not the 250w version, does that mean you might be planning to use more power?