Mensaje originado el: 03/08/10 a las: 19:46 z



From: G8MNY@GB7CIP.#32.GBR.EU
To  : TECH@WW

Stacked 5/8 Wave Co-linear For 430-440 MHz

                                   ±±±
                          Element->±±±
                                   ±±±
 ÄÄÄÄÄÄÄÄ>¿Ú<Ä-Braid               ÅÅ<ÄÄÄ¿
    7mm__ÛÛ³                      ±±±    
 ³       ±±±±             Element->±±±  Shirt Buttons
 ³       ±±±±  5/8 wave            ±±±    
 ³       ±±±±                      ÅÅ<ÄÄÄÄÙ
 ³       ±UR±  E                   ±±±
241mm    ±±±±  L          Element->±±±
 ³       ±43±  E                   ±±±
 ³       ±±±±  M      <---162mm--->ÚÁ¿<--"N" Socket
 ³       ±±±±  E      ÍÍÍÍÍÍÍÍÍÍÍÍÍ´ÃÍÍÍÍÍÍÍÍÍÍÍÍÍ
 ³    ___±±±±  N      Ground Plane ÀÄÙ Ground Plane           
    7mm ³ÛÛ   T
 ÄÄÄÄÄÄÄ>ÙÀÙ

The Elements are made from UR43 or RG58\U (not RG58\CU) coax. You MUST use 50
ohm coax with a solid copper centre.

Use plastic or fibre glass as a tube cover for the elements but do not use gray
tube as this could have a carbon conductive content.

There are four 5mm dia ground planes that must have a contact with the outer
body of the "N" connector socket.

You can "Stack" as many elements as you wish within reason, trim 10mm off the 
last element then check V.S.W.R. Repeat until resonance is achived. Place the
tube cover over the elements w checking V.S.W.R. You should be able to reach a
good resonance around 1 to 1.

Use the holes in the shirt buttons as an isolator between the element solder
connections, the elements are connected inner/outer, outer/inner at each end of
the element "Criss-Crossing" to the next, once completed use some strong
fishing nylon line around the last element to pull all the elements straight
then fix the line over the top of the tube with a waterproof cap.

73 de Alan 2E1ESY  @GB7NND.#23.GBR.EU

73 De John, G8MNY @ GB7CIP