• Butternut Roof Mounting Kits RMK-II
8

BUT TERNUT Manufacturing Co.

Instructions

Model STR-II

The stub-tuned radial kit may be used with all models of vertical antennas in above-ground installations. It

is included as part of the RMK-II Roof Mounting Kit

TO AVOID A POSSIBLE SHOCK HAZARD CONNECT ALL STATION EQUIPMENT TO A GOOD

EARTH GROUND. FOR GREATER SAFETY, DISCONNECT ALL STATION EQUIPMENT FROM

THE A.C. MAINS BEFORE PROCEEDING.

ASSEMBLY

1. Install the antenna according to the manufacturer's instructions.

2. Connect the four STR’s to the grounding screw on the mounting post or solder them to the extra wire

coming from the impedance/matching coil (Q). For antennas from other manufacturers, connect the

STRs to the same point as the braid of the coaxial feedline.

3. Fan out the four STR’s and tie off the insulated ends. The STR’s should not be pulled too tight, but

neither should they be allowed to droop onto the roof or to touch other objects, especially metallic ones.

Ideally, the STR’s should be spaced with 90 degrees of separation between adjacent wires, but they will

work well enough in other configurations if space is limited. If operation on 30 meters with the Butternut

HF6V is intended, cut four 24-ft. radials from the 100 ft. roll of wire, attach end insulators, and run the

30 meter radials out between the STRs. Fewer than four 30 meter radials may be used if necessary, but

two such radials running in opposite directions to each other should be considered the minimum number

for effective performance.

4. Cut one or more 80/75 meter radials to the proper length for the desired band segment. The proper

length, in feet, may be found by dividing 234 by the desired frequency in MHZ, e.g., 234/3.9 MHz=60 ft.

Attach an insulator to one end of this wire and the other end to the ground (braid) connection of the

antenna. Be sure that all radials as spaced as evenly as possible from each other along their length in

order to avoid interaction that could cause detuning. If any radials must be bent because of limited space

try to avoid bends sharper than 90 degrees.

5. Connect the ground side of the antenna to a good earth ground. Use as short a lead as possible.

6. Check for resonance or low-VSWR operation of the antenna according to the manufacturer's instructions.

This diagram shows but one method of

connection. STR’s and single-wire radials

may be connected in other ways so long as

they are connected close to the braid of the

coaxial cable.

All radials may slope downward from the

antenna by as much as 45 degrees, but their

far ends should not be less than several meters above the earth for best results. In windy areas light nylon

twine or monofilament line may be used to support the weight of the STR’s along their length and to

dampen vibration that can cause their relatively light conductors to break.

Parts List

4 V00342 Resonant Radial

1 V00344 Wire Bundle

5 V00222 Insulator

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Butternut Roof Mounting Kits RMK-II

  • Model: Butternut RMK-II kit
  • Beschikbaarheid: Op voorraad
  • € 95,00

  • Excl. BTW: € 78,51