Charlie Tango 11m DX Radio Group Forum
Would you like to react to this message? Create an account in a few clicks or log in to continue.


Welcome to the Charlie Tango DX Group. The home of ALL things Radio - CB, 11m DX, Amateur, PMR446, PLD, Network and Data. We welcome all radio enthusiasts of all knowledge levels. Join today and claim your own unique World Famous CT Call-sign
 
HomeEventsCalendarFAQSearchRegisterLog in
XMAS COMPETITION: Win a Brand New Yaesu ft891 with Wideband Modification and to help the winner use it we are including a 30 Amp Power Supply on top. This is our biggest prize yet. All this could be yours for Christmas for just £20. - See Latest News Forum for details.
Latest Buxton 2020 News: Unfortunately, due to the Covid-19 pandemic we have had to cancel this year's Buxton date. Sorry for any inconvenience.
Navigation
Useful Radio Sites
Log in
Username:
Password:
Log in automatically: 
:: I forgot my password
CT Bill Board





Views This Year
All Time Views
Classified Adverts

Latest topics
» shack lighting
Triple bazooka? Icon_minitimeToday at 11:25 am by Victor

» 11m conditions
Triple bazooka? Icon_minitimeToday at 11:23 am by Captain Fantastic

» Charlie tango Call Sign Request.
Triple bazooka? Icon_minitimeToday at 10:36 am by clivem850

» inverted l on 80 meters
Triple bazooka? Icon_minitimeToday at 10:31 am by rabbi

» Big burners.? Why?
Triple bazooka? Icon_minitimeToday at 9:15 am by Tristar

» Call sign request (Issued)
Triple bazooka? Icon_minitimeToday at 8:10 am by StevieG

» SWR's are better but..............
Triple bazooka? Icon_minitimeToday at 8:06 am by Alan Pilot

» please may i have a ct callsign ? (Issued)
Triple bazooka? Icon_minitimeToday at 7:14 am by Victor

» OFCOM DRACONIAN MEASURES
Triple bazooka? Icon_minitimeToday at 7:08 am by Victor

Keywords
chart ss6900n Sirio yaesu sign supply power president ss9900 antenna callsign division Mckinley radio call bazooka list Mobile midland alan tickets lincoln Calling frequency 9900 Baofeng
QRZ Database
 

 Triple bazooka?

Go down 
AuthorMessage
karelgol
New Member
New Member
karelgol

Call Sign : 19-CT-024
Posts : 37
Times Thanked : 0
Join date : 2020-05-21
QTH or Location : Steenwijk, JO32bs
Equipment Used : Magnum 257HP,Superstar 2000, President Bill Asc, AMP-150, Antron A99, Emperor LA-50
Age : 62

Triple bazooka? Empty
PostSubject: Triple bazooka?   Triple bazooka? Icon_minitimeWed Jun 17, 2020 9:24 am

I'm thinking about building me a triple bazooka for 11m DX, after reading a lot of positive reviews about it, especially the wide bandwidth. Is there anyone who is good with NEC software to simulate the radiation pattern? Which setup should i use? V, inverted V, horizontal, sloped? Any help would be appreciated.

73
Karel
Back to top Go down
View user profile
Northern Crusader
Major contributor
Major contributor


Call Sign : M0GVZ / 26CT1760
Posts : 287
Times Thanked : 20
Join date : 2019-11-13
QTH or Location : IO94SA
Equipment Used : Icom 7300, TS480, President McKinley, Albrecht AE6110, CRT Mike
Age : 50

Triple bazooka? Empty
PostSubject: Re: Triple bazooka?   Triple bazooka? Icon_minitimeWed Jun 17, 2020 6:16 pm

They're crap. I've tried the double bazooka and it was worse than a normal dipole. Unless you're making a dipole with bell wire then it'll have enough bandwidth for the 11m CB band - if you need more bandwidth use thicker wire or use the kevlar antenna wire which has a braid covering a kevlar core. The radiation pattern is the same as a regular dipole.

Inverted V is more omnidirectional, a sloper will be stronger in the direction the lower end of the antenna is pointing

From the website of a company selling it...

https://www.wireantennas.co.uk/triple-bazooka-antenna-27-mhz-dxer
Quote :

"Since this antenna has no exposed metal wire static charges can not build up thus reducing noise by 6dB over antennas constructed of exposed wire.Some additional 'quietness' may partially attributed to the vinyl covering on the coax.
Using covered wire on triple bazooka antennas helps reduce corona and precipitation static."

What utter crap.
Back to top Go down
View user profile
karelgol
New Member
New Member
karelgol

Call Sign : 19-CT-024
Posts : 37
Times Thanked : 0
Join date : 2020-05-21
QTH or Location : Steenwijk, JO32bs
Equipment Used : Magnum 257HP,Superstar 2000, President Bill Asc, AMP-150, Antron A99, Emperor LA-50
Age : 62

Triple bazooka? Empty
PostSubject: Re: Triple bazooka?   Triple bazooka? Icon_minitimeWed Jun 17, 2020 7:31 pm

Thanks, just this afternoon i found this website https://owenduffy.net/antenna/DoubleBazooka/index.htm which uses other words for crap Smile . I'd like an antenna which is a bit more directional then my A99 and i don't have the room (or the neighbors) for a Yagi or moxon.

73
Back to top Go down
View user profile
Northern Crusader
Major contributor
Major contributor


Call Sign : M0GVZ / 26CT1760
Posts : 287
Times Thanked : 20
Join date : 2019-11-13
QTH or Location : IO94SA
Equipment Used : Icom 7300, TS480, President McKinley, Albrecht AE6110, CRT Mike
Age : 50

Triple bazooka? Empty
PostSubject: Re: Triple bazooka?   Triple bazooka? Icon_minitimeSat Jun 20, 2020 8:53 pm

Simple wire dipole it is then, thicker wire will give you more bandwidth and insulated wire will allow you to reduce the length roughly 4% over bare wire. Being where we are I think i'd be inclined to have one running slightly NE to SW in direction so you'll get Europe nice and strong and the USA when it comes in.

Dipoles are a very forgiving antenna and you can bend the legs as needed to fit in the space you require so you could put it up horizontally as much as you can fit in and then have the rest of the wire on each leg hanging down vertically. If you're really stuck on space then you can bend the angle of the dipole from straight and the directivity will be in the intersection of the angles of the legs. For example if you have your antenna set up with the legs running out horizontal one north to south with the feedpoint at the south end and one running out 90 degrees to the east from that feedpoint like |_ it will be directional north east to south west.

Aim to get it at least 16ft high up, any less than that and it'll lose much of its directivity.
Back to top Go down
View user profile
karelgol
New Member
New Member
karelgol

Call Sign : 19-CT-024
Posts : 37
Times Thanked : 0
Join date : 2020-05-21
QTH or Location : Steenwijk, JO32bs
Equipment Used : Magnum 257HP,Superstar 2000, President Bill Asc, AMP-150, Antron A99, Emperor LA-50
Age : 62

Triple bazooka? Empty
PostSubject: Re: Triple bazooka?   Triple bazooka? Icon_minitimeSun Jun 21, 2020 4:43 pm

I've downloaded cocoaNec as it's the only NEC software available on a Mac. I have programmed in C 20 years ago (hated it, so became a teacher), so i understand what the program is doing. Modelled a dipole for 27.205 MHz, but now i'd like to try a dual element wideband dipole. I see possibilities in adjustable aluminium tentpoles. This brings me to my question, how do i insert the connection of the coax braid to the second element into this model?
Back to top Go down
View user profile
karelgol
New Member
New Member
karelgol

Call Sign : 19-CT-024
Posts : 37
Times Thanked : 0
Join date : 2020-05-21
QTH or Location : Steenwijk, JO32bs
Equipment Used : Magnum 257HP,Superstar 2000, President Bill Asc, AMP-150, Antron A99, Emperor LA-50
Age : 62

Triple bazooka? Empty
PostSubject: Re: Triple bazooka?   Triple bazooka? Icon_minitimeTue Jun 23, 2020 11:25 am

karelgol wrote:
I've downloaded cocoaNec as it's the only NEC software available on a Mac. I have programmed in C 20 years ago (hated it, so became a teacher), so i understand what the program is doing. Modelled a dipole for 27.205 MHz, but now i'd like to try a dual element wideband dipole. I see possibilities in adjustable aluminium tentpoles. This brings me to my question, how do i insert the connection of the coax braid to the second element into this model?
It seems i was overthinking it a bit, it turns out to be quite a simple model. Now trying for a step down version.

The code:
// DEWD after UR0GT
// Wavelength taken from ant_design.xls spreadsheet
// Also see DEWD.pdf for background
// If length is given a value above 0, 2 separate wires , driven and gedreven with diameter dikkedia must be designed to form a H shape with the tussenstuk piece.
// This, to produce a stepped down antenna, which still is under development

real sl,ll,WL, afstand, dikkedia,dunnedia ;

model ( "dual element wideband dipole" )
{
real height, length ;
element driven, gedreven, tussenstuk1, tussenstuk2, short1, short2, long1, long2, grondgedreven ;
WL=11.02;
height = 5 ;
length = 0 ;
afstand = 0.0365 * WL;
dikkedia = 0.001 * WL;
dunnedia = 0.001 * WL;
sl = 0.1940 * WL;
ll = 0.2610 * WL;

short1 = wire( afstand/2, length, height,afstand/2,length + sl,height,dunnedia,21);
short2 = wire (-afstand/2, -length, height, -afstand/2, -length - sl, height, dunnedia,21);
long1 = wire ( -afstand/2, length, height, -afstand/2, length + ll, height, dunnedia, 21);
long2 =wire ( afstand/2, -length, height,afstand/2, -length - ll, height, dunnedia,21);

tussenstuk1 = wire(-afstand/2,0,height,afstand/2,0,height, 0.001 * WL ,3);

voltageFeed( tussenstuk1, 1.0, 0.0) ;

frequencySweep( 25.565, 29.365,50);
goodGround();
}

control()
{
runModel();
printf( "WL = %.4f diameter = %.4f  afstand = %.4f \n", WL, dunnedia, afstand) ;
printf( "korte = %.4f lange = %.4f\n", sl, ll) ;
printf( "--- done ---\n" ) ;
}


73
Back to top Go down
View user profile
 
Triple bazooka?
Back to top 
Page 1 of 1

Permissions in this forum:You cannot reply to topics in this forum
Charlie Tango 11m DX Radio Group Forum :: Help and Discussion Forums :: Antenna Discussion-
Jump to: