CUBEX MARK II - PT5 Manual de instruções - Página 4

Procurar online ou descarregar pdf Manual de instruções para Antena CUBEX MARK II - PT5. CUBEX MARK II - PT5 10 páginas. Quad antennas

Instructions:

Cubex - MARK II Series

CAUTION; While every effort has been made in designing and fabricating both the spreader

arms and the spiders for maximum strength, it is possible to suffer breakage if the assembly is

dropped or impacted against buildings, trees, etc., Use care in handling.

FEEDING THE, 2 ELEMENT QUAD. The feed-point impedance's of this antenna will

vary with each band. Twenty meters is about 50 ohms, Fifteen meters = 75 ohms and Ten

meters is about 110 ohms. The CUBEX matching transformer is a combination unbalanced to

balanced and impedance transformation device. It will allow for single feed line with

acceptable SWR while using 3 or 5 bands of operation.

An alternative method of feeding the multi band quad utilizes a remote antenna switch such as

the AMERITRON RCS-8V. When using the remote antenna switch or separate feed lines for

each band it will be necessary to fabricate Co-Ax matching sections from 75 ohm RG11U

cable. These must be an "Odd" one-quarter wavelength to function properly (1,3,5, ,etc.).

For 10 meters use 69 inches of RG/11U attached to 10 -meter DRVN. EL. FEED POINT and

any length of RG8/U from the other end of the RG/11U to the transmitter.

For 15 meters, use 92 inches of RG/11U attached to the 15-meter DRVN. EL. FEED POINT

and any length of RG8/U from other end of RGII/U to the transmitter.

Any excess cable can be coiled (6" dia.) and taped together.

See Table I on the following page for dimensions of linear matching sections.

NOTE: In some situations it maybe be better to make a 3/4 wave (207 in) 75 ohm 10 m

stub. Any excess cable should be wrapped and taped into a 6" coil.

Where a REMOTE SWITCHING SYSTEM is used, one would position the remote unit at a

point on the boom where both 10 and 15 meter matching sections could terminate at the box.

This would eliminate splicing of cables, Baluns are generally not needed and have proven

effective in only a small percentage of unusual situations. Fortunately, the great majority of

quad installations perform very satisfactorily without the need to resort to complicated

matching systems, but in an occasional "rare" case of difficulty, the Gamma Match (either

individual or Tri-Gamma) has proven to be a good solution. For Gamma Match information

see "Old Notes" at end of instructions.

The CUBEX matching transformer is an excellent choice for matching the antenna system to

the transceiver. It is rated at 1.5 kw PEP and allows for a single FEED LINE and matches the

CUBEX antenna without the hassle of complicated matching networks.

Good luck and DX –

Cubex Co., Inc.

06-03 Rev 9

Pg. 4