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G8MNY > TECH 19.03.05 02:50l 49 Lines 1847 Bytes #999 (0) @ WW
BID : 37439_GB7CIP
Read: DK3TB GUEST
Subj: 70cm Collinear
Path: DB0FHN<DB0RGB<OK0PPL<DB0RES<ON0AR<GB7CIP
Sent: 050318/2322Z @:GB7CIP.#32.GBR.EU #:37439 [Caterham] $:37439_GB7CIP
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 grey
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 achieved. 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 "Crisscrossing" 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
Why Don't U send an interesting bul?
73 De John, G8MNY @ GB7CIP
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