dipole for 27.555 whats best ??? 1/2 wave or 1/4 wave
- Buick Mackane
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Re: dipole for 27.555 whats best ??? 1/2 wave or 1/4 wave
I made my first 11m dipole last year and was amazed with the results, Even with it being in the attic it boomed out, Great RX too, Had a bandwidth of 2 Mhz, Easy as pie to make, Best to put 5 turns of coax with a diameter of about 4 inches below the feed point, This stops the coax radiating, Which can cause all kind of strange effects, Like false SWR Readings,
Loads of dipole calculators online that do the maths for you, Just pick your centre frequency, Cut to size and bobs your uncle and carols your dad
Loads of dipole calculators online that do the maths for you, Just pick your centre frequency, Cut to size and bobs your uncle and carols your dad
I Am the great cornholio are you threatening me ?
- astradyne
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Re: dipole for 27.555 whats best ??? 1/2 wave or 1/4 wave
The A99 is a very convenient antenna for portable DX. Fixes together in a minute, no need to adjust for a good SWR, work well for what they are and quick and easy to take down and stick in the car.andrew013 wrote: ↑27 Sep 2017, 17:31you must have some S H I T E experience then ,ch25 wrote:Nah, just some radio fan with some experience.NightProwler wrote:Yes he does like to slag off everything and think he is superior to everyone else, Just another troll. Stick with the Imax, Excellent antennas
I won't convince you, but I had Imax, A99, Shakespeare big stick along with nice aluminium antenna on the switch for a long time.
Difference is easy to notice. Try yourself.
user of radio since 79 , had many radios and ariels , just dont go on about it , imax from new i have lost count now how long its been must be 16+yrs still work the world on 4 watts am and upto 20 watts ssb if need be if using my low powerd cb radios i also have an imax for portable use nothing wrong with them or a99`s
Never, ever, ever....bloody anything ever!
Far too many radio's to list here. But I do own a legal one...
Far too many radio's to list here. But I do own a legal one...
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Re: dipole for 27.555 whats best ??? 1/2 wave or 1/4 wave
There is the Double Zepp.Tigersaw wrote: ↑18 Sep 2017, 11:10 The full wave dipole would be very high impedance if fed from the centre, it could be done if you feed with balanced line, or use a matching transformer, but best stick with the 1/4 wave either side if fed with co-ax for a single band antenna, look to get it at least 5 metres above the ground.
Basically it is a J pole with the J match turned through 90 degrees then put another 1/2 wave radiator on the other leg of the J match.
The J match will be twin feeder shorted at the bottom with the coax feeding in above it.
Better still is the Double Extended Zepp with each arm being .64 wavelength (and retweaks to the matching)
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Re: dipole for 27.555 whats best ??? 1/2 wave or 1/4 wave
I used to have a sirio 827 back in 1998. I'm back to the radio since last year and i've built an inverted v dipole for a few euros. A decent vertical antenna cost about 100 euros and you can build a dipole for less then 10 euros. The dipole seems to work pretty well, very low qrm.
English is not my native language.
73
Marco
English is not my native language.
73
Marco
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Re: dipole for 27.555 whats best ??? 1/2 wave or 1/4 wave
Apologies for resurrecting a somewhat elderly thread but I just found 2 pennies in the sofa and feel the need for sharing.
First I'd just like to say, Imax are SHE!T!
..at least that's what I keep hearing & reading in more recent posts, as it seems they've cheapened quality control and many now come out of the box with untunable & untenable 2:1 SWR or higher. She!t!
Well, enough of that.
Regarding the dipole question, should you get a wild haire up your bumm to try for improvement, or for anyone else perusing, if you're not familiar with a vertical inverted Delta Loop, it's easy, quiets static, provides a large capture area, covers both vertical & horizontal and provides a sweet bit of lower angle gain.
I use any old strong stranded wire, typically 12gauge for both birds & antennas, formula =
1005/freq in MHz = feet
so about a full wavelength wire folded into an equilateral triangle standing on it's point, (horizontal across the top side) and fed at the bottom point with a 4:1 balun (I use Bob's @ Balun Design).
I see about S9 on local when the Imax offers S6 but in DX I'm averaging S9+10-20 when the Imax offers S5-S8.
It's a sweetie with local noise, drops from S4-S5 on the Imax to <S1 on the DL.
Have fun
First I'd just like to say, Imax are SHE!T!
..at least that's what I keep hearing & reading in more recent posts, as it seems they've cheapened quality control and many now come out of the box with untunable & untenable 2:1 SWR or higher. She!t!
Well, enough of that.
Regarding the dipole question, should you get a wild haire up your bumm to try for improvement, or for anyone else perusing, if you're not familiar with a vertical inverted Delta Loop, it's easy, quiets static, provides a large capture area, covers both vertical & horizontal and provides a sweet bit of lower angle gain.
I use any old strong stranded wire, typically 12gauge for both birds & antennas, formula =
1005/freq in MHz = feet
so about a full wavelength wire folded into an equilateral triangle standing on it's point, (horizontal across the top side) and fed at the bottom point with a 4:1 balun (I use Bob's @ Balun Design).
I see about S9 on local when the Imax offers S6 but in DX I'm averaging S9+10-20 when the Imax offers S5-S8.
It's a sweetie with local noise, drops from S4-S5 on the Imax to <S1 on the DL.
Have fun
I don't deserve to be so humble
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Re: dipole for 27.555 whats best ??? 1/2 wave or 1/4 wave
^^ Why would you continue to use a sh1te Imax,knowing its sh1te JAFO ? ^^
Plenty are talking worldwide on 27.555 usb,
Some are too far up their own @rse to admit it,
Many happen to know otherwise dx-ing test free,
Showing a complete lack of respect for the law.
27.555 Usb
Some are too far up their own @rse to admit it,
Many happen to know otherwise dx-ing test free,
Showing a complete lack of respect for the law.
27.555 Usb
- MrWeetabix
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Re: dipole for 27.555 whats best ??? 1/2 wave or 1/4 wave
Also, declaring something as SHE!T based on second hand information is hardly a fair assessment. Opinions are like 4rseholes..... everyone has one.
26TM175. OP: Craig. QTH: Gateshead IO94EW. Also 163TM175 when mobile in Wales
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- ch25
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Re: dipole for 27.555 whats best ??? 1/2 wave or 1/4 wave
Sadly, JAF0 is right.
WE ARE MOTÖRHEAD, AND WE PLAY ROCK N' ROLL
You can't have too many antennas...
You can't have too many antennas...
- MrWeetabix
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Re: dipole for 27.555 whats best ??? 1/2 wave or 1/4 wave
as I was saying.....
26TM175. OP: Craig. QTH: Gateshead IO94EW. Also 163TM175 when mobile in Wales
Transmission1 on Facebook http://tinyurl.com/TM1onFB | Tango Mike on Facebook http://tinyurl.com/TangoMikeFB |
Transmission1 on Facebook http://tinyurl.com/TM1onFB | Tango Mike on Facebook http://tinyurl.com/TangoMikeFB |
- Buick Mackane
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Re: dipole for 27.555 whats best ??? 1/2 wave or 1/4 wave
Aye fooking G-callsign holders, The oracles of the airwaves
Just noticed your comment drew, Better late than never
I Am the great cornholio are you threatening me ?
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Re: dipole for 27.555 whats best ??? 1/2 wave or 1/4 wave
So what is the best aluminium vertical antenna,that has 4 1/4 wavelength groundplane legs,for using on CB in your opinion Chris ?
Plenty are talking worldwide on 27.555 usb,
Some are too far up their own @rse to admit it,
Many happen to know otherwise dx-ing test free,
Showing a complete lack of respect for the law.
27.555 Usb
Some are too far up their own @rse to admit it,
Many happen to know otherwise dx-ing test free,
Showing a complete lack of respect for the law.
27.555 Usb
- prettypolly
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Re: dipole for 27.555 whats best ??? 1/2 wave or 1/4 wave
i got an old sirio tornado 27 and added 4 x 9ft gps and there wasnt much difference in swr and rx really . im goung to try 4 x 6 ft gps next in a tic tac toe format..on an old 5/8ths silver rod .. it should be interesting..
- ch25
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Re: dipole for 27.555 whats best ??? 1/2 wave or 1/4 wave
I quote myself:
827 is not bad choice too. 1/4 legs are not needed in that case.
Chris
WE ARE MOTÖRHEAD, AND WE PLAY ROCK N' ROLL
You can't have too many antennas...
You can't have too many antennas...
- WARLOCK
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Re: dipole for 27.555 whats best ??? 1/2 wave or 1/4 wave
hi Chris , What about a sirio GPE27 5/8 wave ??
- ch25
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Re: dipole for 27.555 whats best ??? 1/2 wave or 1/4 wave
1. Bad radials mounting. Will corrode quickly.
2. Bad element joining. Should be cut vertically and bolted through.
3. Too short to be real 5/8:)
2. Bad element joining. Should be cut vertically and bolted through.
3. Too short to be real 5/8:)
WE ARE MOTÖRHEAD, AND WE PLAY ROCK N' ROLL
You can't have too many antennas...
You can't have too many antennas...