dipole for 27.555 whats best ??? 1/2 wave or 1/4 wave

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Buick Mackane
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Re: dipole for 27.555 whats best ??? 1/2 wave or 1/4 wave

Post by Buick Mackane » 03 Jan 2018, 00:46

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 :thumbup:
I Was asked to QSL Via the Bureau, But the FBI Said i'll be prosecuted if i phone them again, :shock:

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Re: dipole for 27.555 whats best ??? 1/2 wave or 1/4 wave

Post by astradyne » 03 Jan 2018, 13:07

andrew013 wrote:
27 Sep 2017, 17:31
ch25 wrote:
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 :thumbup:
Nah, just some radio fan with some experience.
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.
you must have some S H I T E experience then ,
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
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.
Never, ever, ever....bloody anything ever!

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

Post by G8YMW » 07 Jan 2018, 20:43

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.
There is the Double Zepp.
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

Post by Dx121 » 13 Nov 2018, 22:49

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

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Re: dipole for 27.555 whats best ??? 1/2 wave or 1/4 wave

Post by JAF0 » 27 Feb 2019, 10:36

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 :)
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

Post by 108EH002 » 28 Feb 2019, 13:48

^^ Why would you continue to use a sh1te Imax,knowing its sh1te JAFO ? ^^
Pay the governments tax or freeband on CB test free.
27.781.25 FM - 27.555 USB - 27.385 LSB - 27.315 FM

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Re: dipole for 27.555 whats best ??? 1/2 wave or 1/4 wave

Post by MrWeetabix » 28 Feb 2019, 14:06

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: Tynemouth. Also 163TM175 when mobile in Wales 8)

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Re: dipole for 27.555 whats best ??? 1/2 wave or 1/4 wave

Post by ch25 » 28 Feb 2019, 14:30

Sadly, JAF0 is right.
You can't have too many antennas...

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Re: dipole for 27.555 whats best ??? 1/2 wave or 1/4 wave

Post by MrWeetabix » 28 Feb 2019, 14:56

as I was saying.....
26TM175. OP: Craig. QTH: Tynemouth. Also 163TM175 when mobile in Wales 8)

PO Box: 62 Town: Albrighton City: Wolverhampton Zip: WV7 3WR

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Re: dipole for 27.555 whats best ??? 1/2 wave or 1/4 wave

Post by Buick Mackane » 28 Feb 2019, 18:15

kilimax wrote:
27 Sep 2017, 18:06
It's just so disappointing and bl00dy annoying when you get folk who think they are the foremost authority and they know best and ridicule others.



Aye fooking G-callsign holders, The oracles of the airwaves :yawn:


:lol:

Just noticed your comment drew, Better late than never :lol:
I Was asked to QSL Via the Bureau, But the FBI Said i'll be prosecuted if i phone them again, :shock:

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Re: dipole for 27.555 whats best ??? 1/2 wave or 1/4 wave

Post by 108EH002 » 02 Mar 2019, 08:23

ch25 wrote:
28 Feb 2019, 14:30
Sadly, JAF0 is right.
So what is the best aluminium vertical antenna,that has 4 1/4 wavelength groundplane legs,for using on CB in your opinion Chris ?
Pay the governments tax or freeband on CB test free.
27.781.25 FM - 27.555 USB - 27.385 LSB - 27.315 FM

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Re: dipole for 27.555 whats best ??? 1/2 wave or 1/4 wave

Post by prettypolly » 02 Mar 2019, 10:43

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..

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Re: dipole for 27.555 whats best ??? 1/2 wave or 1/4 wave

Post by ch25 » 02 Mar 2019, 12:10

108EH002 wrote:
02 Mar 2019, 08:23
ch25 wrote:
28 Feb 2019, 14:30
Sadly, JAF0 is right.
So what is the best aluminium vertical antenna,that has 4 1/4 wavelength groundplane legs,for using on CB in your opinion Chris ?
I quote myself:
ch25 wrote:
09 May 2018, 21:12
Decent aluminium antenna have radiating element close to 5/8 length and it is electrically extended to 3/4. It gives best elevation.
Sirio 2008 or 2016 for example.
827 is not bad choice too. 1/4 legs are not needed in that case.
Chris
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Re: dipole for 27.555 whats best ??? 1/2 wave or 1/4 wave

Post by WARLOCK » 02 Mar 2019, 17:26

hi Chris , What about a sirio GPE27 5/8 wave ??

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Re: dipole for 27.555 whats best ??? 1/2 wave or 1/4 wave

Post by ch25 » 02 Mar 2019, 17:40

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:)
You can't have too many antennas...

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