Homebrew aerial

[yarmouthshipping]

Is there an easier homebrew than the one shown ?? if not, the coils do they twist slightly up or are they flat?

Thanks

Simon

[Anmer]

Hi Simon

Which one "shown" where?

[yarmouthshipping]

Sorry one shown in a post in this section of the forum http://www.tech-software.net/1090_ant_02.JPG

[Truetrack]

Hi Simon

no, there is nothing more simple to that proven design
Frankly you have to stick only with the coax-connector or your chioce,
the disc performing as a ground plane,
and the length of some copper wire.
There is only one turn each which may be twisted around some
and when the ends meet just later pulled apart a bit.
The exact distance between the two coils are not easy to hit,
some people had cut in between and soldered a piece between the coils.

All the rest is for fixing and weather proofing and may be any plastic material
(which has no hidden iron powder within, as some gutter pipe do)

Give it a try

[yarmouthshipping]

Hi Klaus

Thanks for that i will have a go, but do you definitely need 50mm pipe would 32mm do or even 20mm

the thing that stumps me is the collars to wedge the 2 lengths of pipe to the disc of aluminium plate

Simon

[shakysen]

Hi Simon. Have built two in the last couple of months. Only my opinion! they  pull in better then radar-100 Only concern is supporting them in 50 -60 mph winds.
But I will overcome it. Very easy to build

                                                                                  Regards
                                                                                   Billko

[Truetrack]

Thanks for that i will have a go, but do you definitely need 50mm pipe would 32mm do or even 20mm

the thing that stumps me is the collars to wedge the 2 lengths of pipe to the disc of aluminium plate

Simon

The dims for the cover are not at all critical, and as Billko put it the windload might be a factor to be considered.
32mm should certainly be ok provided you find a way of  getting/keeping the copper rod more or less in center
at least not touching the piping ( e.g. styrofoam wafers or such  )
BTW it must not be aluminum for the disc, copper might to heavy, tin can mat'l needs protection laquer
against corrosion.

[yarmouthshipping]

Ok then i will have a go and see what happens thanks for all the advice

[Truetrack]

Here some background info
these measures are dependent of frequency respective wavelength
and here 1/4 WL or multiple thereof.
And that stand for those two single turn coils also.
The Dia of 20mm or ( ~ 22mm centre to centre multiplied by Pi  3.14 ) should represent
6.9 cm which again is 1/4 WL !

Myself found it is best to mark off the different portion of length,
continue with the sharp bends and finally form the single 20mm turns.
I had used 2mm iron welding rod for indoor attic use, maybe 3mm hard copper rod
is harder to bend.

[yarmouthshipping]

Hi Simon. Have built two in the last couple of months. Only my opinion! they  pull in better then radar-100 Only concern is supporting them in 50 -60 mph winds.
But I will overcome it. Very easy to build

                                                                                  Regards
                                                                                   Billko

Where did you get the bits from i tried the usual subjects bq hb wilkes

they had pipe and thats it

Regards

Simon

[shakysen]

Hi Simon. Have you any wire coathangers?. They work fine you may have to scrape off the coating to solder it to the socket. I have used wire of hangers for all kinds of antennas. and hairpin matches for my yagis. Another way is twin and earth take the solid earth wire and use that (30 amp)

                                                                                                             Billko

[yarmouthshipping]

Sorry meant the pipe end caps and collars

[shakysen]

Hi Simon I got mine from Koi center I use them on my filters .50mm £1.50 for end caps £2.50 mtr for pipe


                                                           Billko

[yarmouthshipping]

No wonder i cant find the bits never mind

[shakysen]

Hi again Simon.You have just solved the windage problem for me. Not going rooting around now.Tomorrow will do Ithink I have some thick walled pressure pipe 25 mm
and a25mm flange will let you know later if it works


                                                                                     Billko