I was getting a lot of noise on 40 meters on my Comet H-422. I thought I would try a double bazooka antenna.
Пікірлер: 78
@hartman07211 жыл бұрын
WX4AR de K4MR Mike, Just to let you know that you DID do a GREAT job in this tutorial!! I made the bazooka EXACTLY like you said, 67', and let the tuner take up the slack (if any!!). Compared it to my G5RV and my Buckmaster and the Bazooka IS MUCH QUIETER!! Transmits supper!! GREAT JOB to you and Dav!! 73!! Mike
@reallybadaim1184 жыл бұрын
A group around me on HF passed around a photocopy of this antenna for 80 and went wild with it. It performed very well. Everyone has spare RG-8 laying around. This was back in the early 1990s.
@paganphil1005 жыл бұрын
Great video Bill....I've been using this design for over a year (a single-band DB antenna) and because of the very wide bandwidth I've never had to adjust the VSWR. The noise level is about 60% lower than it was before when I was using verticals and standard dipoles :-)
@Mschasz31293 жыл бұрын
Nice job guys. DAV is very good friend. He really helped me a lot with my bazooka building. I live on hill side about 750' above sea-level an these antennas do what they say. Nice an quiet but put out a big signal. I dont bother wasting money on anything else for HF or 6m. If I need more signal I just run my SB220. That's all I ever needed.
@JosephMassimino7 жыл бұрын
The bigger coax will result in a wider bandwidth, it may not be so apparent at some frequencies, but the wider coax, just like larger diameter elements on a beam, all result in improved bandwidth. Some people want to believe what they want, and disregard all the testing done between a dipole and a Double Bazooka. The lower noise is due to the plastic covering on the coax. RadioWavz uses RG11 in their design , and they make a very nice DB. The RG11 is closer to .5" wide, and it gets great results. At 40M, you may not notice the lack of bandwidth, but at 80M, it will be obvious if you compare the two.
@marcelopu2mal2475 жыл бұрын
Can I use RG6 instead of RG11?
@n0lyi12 жыл бұрын
Good video Bill....think I'm gonna put one up for 12 meters and hopefully be able to use it for 10 as well. Good Dx, Doug, AA0DW
@pmsecretary524 жыл бұрын
NICE JOB Bill
@vasilepop436910 жыл бұрын
Nice video! Keep up the good work! 73 de VA6POP
@fayebower43127 жыл бұрын
Good video. Didn't show how to attach the end point though. Suppose you just looses an insulator?
@watcherman6511 жыл бұрын
thanks for making this informative video..
@WX4AR8 жыл бұрын
I guess it the same as here in the mid Atlantic section of the US we "park the car in the yard", whereas in New England the " pak the ca in the yad
@courtneyashley257011 жыл бұрын
hey bill great looks like u got a nice radio there i too made one of these but for 11 meter works great and was pretty easy i will say this i have a real problem with the braid on coax as far soldering goes 73s ashley1
@JayN4GO5 жыл бұрын
Wait til you try the doubleB loop. Amazing
@WX4AR5 жыл бұрын
Thanks for the comment, I will be sure to check that out, 73.
@greglee40166 жыл бұрын
the content is good. Just the focus drifting in and out made me feel a bit seasick. I have been using a Double bazooka on 40m for about 10 years. I find it a great antenna and agree that it has less noise than a dipole in the same place and orientation.
@paganphil1005 жыл бұрын
Greg Lee: Agreed....it also has a much wider bandwidth.
@TheGekko6412 жыл бұрын
One word...Focus!
@richardevans59213 жыл бұрын
made me feel sick
@muratisiyel39506 ай бұрын
Hello, your work is very nice, what I want to ask is what happens if there is no tail section left at the ends, is there any harm in adjusting the SWR ti by folding or cutting the ends and soldering them again?
@WX4AR3 күн бұрын
Sorry it took so long to answer your question. I had no issues with SWR. I can only assume you’ll have none as well. Good luck and 73.
@fabricioribeiro88808 жыл бұрын
good day you could help me with the calculations of the double bazooka to the frequency of 6900 because I have a small farm and want to make a lot but I have no experience required
@daverobinsonkb7gp6494 жыл бұрын
66.67 FT (20.32 M) AND 47.1 FT (20.32 M)
@Bxcowboy9 жыл бұрын
Excellent tutorial, showed me just enough to get myself in trouble, hihi W1WRM
@WX4AR9 жыл бұрын
Bxcowboy I get myself in trouble every time I turn on the power supply! Good luck.
@blahbadyblah4 жыл бұрын
A common misconception is that better coax is...well...better! Coax with a shield of about 60-ish% works best. I've seen some very poor performing double bazookas, usually due to the wrong choice of coax. Another issue is using a small wire size on the ends. If you want it to be broad banded, use 300 ohm twinlead on the ends. Short the 2 sides together. RF-wise, that makes a large cable on the ends. I used 450ohm window line once but the antenna flapped in the wind too much. To tune the antenna, just fold the twinlead back on itself on the ends...no need to cut. Finally, use marine heat shrink at the transition from coax to twin lead and on the very ends. I've had one for 80M 30 feet up for 8 years with an old toothbrush center wrapped in emergency tape.
@kn9ioutom11 жыл бұрын
TNX FER GREAT ANTENNA VIDEO ! 73 DE K9IOU CHICAGO
@danilodavanzzo8 жыл бұрын
Good afternoon William; I live in an apartment, if I put the antenna on the balcony; You will be good? I live on the 2nd floor and the building is 14 floors. Danilo - PY2XL.
@Satchmoeddie8 жыл бұрын
Try to get roof access. That kicks ____! Loop antennas are great for apartments.
@danilodavanzzo8 жыл бұрын
Got I, I'll find a way to help me with some antenna, but thanks for the return. 73 ...
@dean54856 жыл бұрын
its 60 feet long balcony wont do maybe a homemade slinky dipole search you tube for slinky dipole very short dipole
@miguelmariopalmieri73967 жыл бұрын
Lamento profundamente no entender el idioma. Me hubiera gustado comprender el relato para poder construir una bazooka según las indicaciones del video. LU2DPH
@predragmarkovic951810 жыл бұрын
noting spejsen,clasik
@859229161311 жыл бұрын
could you use 75 ohm cable can find lots of it 73 ks4ww
@dean54856 жыл бұрын
yes but smaller radius lower recieve thicker the better
@jimc53085 жыл бұрын
I would not use 75 ohm since it's foil and braid shielding is not as lossy as what is needed for this antenna to work correctly. MIT original design formula was based on using lossy coax. You can use it but you will find that it will not perform any better than a standard wire dipole.
@AndrzejSQ9PKW3 жыл бұрын
I'm going to make one at 20m band. It will be more difficult coz I'm using metric system XD hah
@piraatje05311 жыл бұрын
is this for 27mhz too?
@paganphil1005 жыл бұрын
piraatje053 : Yes....you can buy or make one for any frequency. See link below for 27 Mhz. www.ebay.co.uk/itm/Double-Bazooka-Antenna-CB-Citizen-Band-Radio-11-meter-27-MHz-DXer-3/192745208464
@bangunuriptvtani Жыл бұрын
👍👍🙏
@stephandelange36253 жыл бұрын
Great explanation however camera/cellphone operation not good! You used a type of tripod in the beginning and picture/video was ok but once you trying to show the various methods and how to all is out of focus! Very disturbing! Going to build a bazooka this weekend and the video did help. ZR6SW 73.
@jjgr6612 жыл бұрын
Good vid 73’ VE6GTZ
@enaliospearfishing10 жыл бұрын
I have high SWR why?
@WX4AR10 жыл бұрын
I can't say Nick. I got nearly perfect swr over the entire band. The only thing I can say is re-check your measurements and make sure all your connections are sound. Good Luck.
@enaliospearfishing10 жыл бұрын
ok thanks .Do you have skype I want to send you some images about my antena
@OneDawkinsFan9 жыл бұрын
Why is the bazooka 'much quieter' than a dipole?? Is that just an urban myth?
@juststeve76659 жыл бұрын
OneDawkinsFan because the feedpoint is a DC shunt. It is well known that shunt fed antennas are "quieter" less noise. shunt fed antenna is safer also... all static or corona is shunted directly to ground.
@GTARockman6 жыл бұрын
I didnt hear any difference. The antenna is the same design except for use of the shield. The idea is a gimmick. no gain, no improvement.
@WW5RM5 жыл бұрын
@@GTARockman yes it is to a gain! Try working a station with QRM or atmospheric noise and you will see the difference! Just listening to the noise floor where there isn't any and you wont see the difference!
@GTARockman6 жыл бұрын
wow, you are a big dude. I would like to gain some weight, never had much weight from anyone in my family. How do you say I can gain weight?
@kellybryson43193 жыл бұрын
Good job bill 73 de Ki7gvm
@kellybryson43193 жыл бұрын
Good job bill de Ki7gvm
@RevGunn-jq3cq6 жыл бұрын
I couldn't hear any difference
@tjrjcj6 жыл бұрын
FYI k3dav.com no longer exists
@oncueprovegas10 жыл бұрын
lear how to use a Camera
@WX4AR10 жыл бұрын
Wow, Really? Are you bored?
@oncueprovegas10 жыл бұрын
it is very irritating to watch an un focus video Please lear to use a CAMERA!!!!!!!!!!!!!!!!!!!!or take the auto focus off
@emknapp67139 жыл бұрын
Tizoc Romero*learn
@pmsecretary524 жыл бұрын
@@oncueprovegas LEARN TO SPELL
@Lindomar8503 жыл бұрын
Muito bom! 73 pu5rsl
@feeatlastfeeatlast52837 жыл бұрын
The bazooka works exactly the same as a regular dipole. No bandwidth improvement, not llower noise. But until you have done a real comparison you may be deluded into believing the myths about this antenna.
@GTARockman6 жыл бұрын
Agreed, this antenna is a gimmick to sell dipole antennas.
@WW5RM5 жыл бұрын
Wrong! Not sure why you think this but it is a superior antenna! It was designed at MIT in the 1940s for radar stations! And you think they designed it as a gimmick? Lmfao! Ive run numerous types of wire antennas over the years and always come back to it! The only downside to a double bazooka is its strength and weight. The shorted stubs at the connection is usually where the biggest problems occur. But that can be over come by strengthening this connection. When band conditions are noisy ( which is most of the time ) I am always glad Ive got it on my feed line! QRM and atmospheric noises can and often cause stations to be unintelligible even with a decent signal. I have high freq hearing loss and many many times it is hard for me to understand what a station is saying even though I can see the S meter moving! Add some extra noise and it will wipe them out completely! Switch to my double bazooka and its Q5 copy! I have experimented with just about all wire antennas since getting my ticket in 1992. Everything from long wire receive antennas, long wire coax receive antennas, windoms, loops, verticles etc but even running separate receive and transmit antennas which in some cases helps I always come back to my old faithful friend double bazooka! Say what you want but Ive side by side tested it in numerous scenarios from DX, NVIS, ground wave, horizontal to inverted V and its better it most situations unless you have perfect conditions which is rare! When you need to work a specific station a lower noise floor is your friend! de WW5RM
@paganphil1005 жыл бұрын
feeatlastfeeatlast : You obviously haven't tried comparing them.....I have and the Double Bazooka has a MUCH wider bandwidth than a standard dipole, a lower noise-level and it doesn't need a balun if fed with coax. With the Bazooka design its the braid that radiates and the inner core that acts as a balun, unlike the standard dipole. I've used a standard Dipole, a Double bazooka and a Triple Bazooka and the Double bazooka easily out-performs the others. More Info. at the link below. wireantennas.co.uk/double_bazooka.html
@WW5RM5 жыл бұрын
@@GTARockman no. real Hams build their own antennas so why would this be a gimmick? Especially back in the 1940s?
@feeatlastfeeatlast52835 жыл бұрын
Quite the contrary, I HAVE built the antenna, measured the swr carefully on 40 meters and then converted it to a standard dipole and the results are identical. You should investigate further by finding the article and analysis by a real antenna expert Walt Maxwell. August 1976 Ham Radio magazine. The MIT antenna was designed for vhf frequencies where the impedance of the coaxial sections causes it to behave completely different that the hf band antennas. But you have to have the ambition to do the research, not believe the hype and lies from people who don't understand antenna theory.
@davidmeale95728 жыл бұрын
why do Americans sodder wires and we SOLDER wires ???
@dean54856 жыл бұрын
and here we soldier wires
@jimc53085 жыл бұрын
It's all in the accent Y'all
@blahbadyblah4 жыл бұрын
It goes back to Middle English where the L is not pronounced but used as a modifier to the vowel for proper pronunciation.
@xhalin4 жыл бұрын
Focus the camera would be good. Why do people do this. Post a good informational video and crap focus. No excuse.
@GTARockman6 жыл бұрын
So, why are you trying the double bazooka? Totally different? Wow. None. its just a dipole antenna. I never seen anyone with great performance better than any dipole. I know several people with the antenna. There was NO noise difference at all in the two antennas you show here. This delusion that the bazooka is better is marketing bullcrap hype to sell antennas. How could it possibly be any quieter? Impossible.
@WW5RM5 жыл бұрын
So MIT in the 1940s was designing a gimmick for the military?
@MrMotorchild5 ай бұрын
@@WW5RM MIT designing a gimmick for federal grant money???
@WW5RM5 ай бұрын
@@MrMotorchildI was asking a question. You respond with a question. That makes sense to you? All I know is I've had numerous wire antennas and none perform as well as the DB. You might not see as much signal strength but that's by design. What matters is signal to noise ratio and that's where it shines. It's a DC shunt and the noise floor is lower. Which sometimes causes signals to be lower but with a lower noise floor you can work weaker stations and it helps reduce QRM. Added plus is increased bandwidth. I build my wire antennas myself. I dont buy anything I can build myself.