CUSHCRAFT R7 - Installation and Tuning; INSTALLATION; HELPFUL HINTS

R7
be 15 to 25 KHz per inch (5 to 10 KHz/cm). When the antenna is completely adjusted, check all fasteners to be sure they are tight. Improving
VSWR's that are less than 2:1 will not noticeably improve station performance.
INSTALLATION
Following the guidelines in the location and adjustment sections above, place the antenna on its mast in its final operating location. If you plan to
install the antenna in a salty or corrosive environment, you may want to consider coating it with a clear marine varnish or equivalent after final
assembly and adjustment has been completed. Now connect your transceiver. If you have any difficulties, reread the information above and the
helpful hints below.
HELPFUL HINTS
* Try to locate your R7 as far away from TV antennas and their feedlines as possible. This will help to avoid overloading your television with RF.
* The dimensions recommended in figure 5 are based on mounting the R7 approximately 8 feet (2.4 meters) above the ground and 25 feet (7.5 meters)
from surrounding objects. Antennas installed with less clearance may require additional adjustments.
* Ifyou check the resistance across the coax connector on your R7 you will finda DC short. This is normal. It does not mean that the RF path is short
circuited. It is approximately 50 Ohms at your operating frequencies.
* High VSWR is sometimes caused by poor contact between the matching network and the counterpoise rods. Make sure that corrosion has not formed
on the jumper strap terminals. Check to insure the hardware is tight.
* Make sure that the counterpoise brackets are 1 inch (2.54 cm) above the antenna base and 1-3/4 inch (4.45 cm) below the radiator as shown on figure
1. The counterpoise is a frequency sensitive system. Changing its length will degrade the R7's performance.
* If your R7 is very close to your shack you may experience RF on the feedline. Try lengthening your feedline several feet, placing an RF ferrite bead
on the coax, winding the feedline on a toroid or winding the coax in a 10 turn coil 8 inches (20 cm) in diameter.
* Weather sealing the matching network is not necessary. We have provided a large hole near the coax connector to allow air to circulate through the
box and to keep it dry. Keep this hole clear to avoid difficulties caused by humidity and condensation.
* Long periods (30 seconds or longer) of key down operation, such as RTTY, at high power (over 1000 Watts) may damage your R7.
MASTER PARTS LIST
P/N DESCRIPTION QTY KEY PIN DESCRIPTION
Base Section Assembly, 1-3/8" x 48" (2.8 x 121.9 cm) 011941 #8 split lock washer
1-1/4" x 48" (3.2 x 121.9 cm) aluminum tube 050077 += 3/8" (.95 cm) black plastic cap
slotted one end 010079 8-32x 1/2" (1.27 cm) stainless steel machine screw
1-1/8" x 48" (2.9 x 121.9 cm) aluminum tube 010083 1/4-20 x 1-1/4" (3.2 cm) stainless steel machine screw
slotted one end 010084 1/4" (.63 cm) stainless steel split lock washer
1-1/8" x 9" (2.9 x 22.9 cm) aluminum tube slotted 010085 1/4-20 stainless steel hex nut
both ends 202296 = 7/8" x 3-3/4" (2.22 x 9.53 cm) radial clamp
1" x 14" (2.5 x 35.6 cm) aluminum tube slotted 203110 Mast mounting ring
both ends 050115 Vinyl connector boot
1/2" x 24" (1.3 x 61 cm) aluminum tube slotted 240116 — Silicone grease packet
one end 203119 = 7/8" x 5-3/8" (2.22 x 13.7 cm) radial clamp
3/8" x 24" (.9 x 61 cm) aluminum tube 010220 10-24 stainless steel hex nut
10/12 meter trap assembly 34-5/8" (88 cm) 010231 8-32 x 1-3/4" (4.44 cm) stainless steel machine screw
15 meter trap assembly 15" (38.1 cm) 010233 #10 stainless steel split lock washer
17 meter trap assembly 15-3/4" (40 cm) 030407 = 7/32" (.5 cm) stainless steel worm clamp
20 meter trap assembly 21" (53.3 cm) 030409 = 7/8" (2.22 cm) stainless steel worm clamp
TV5 30 meter trap assembly 23" (58.4 cm) 030410 _1"(2.54 cm) stainless steel worm clamp
030411 1-1/4" (3.17 cm) stainless steel worm clamp
XHR 3/16" x 36" (.4 x 91.4 cm) aluminum rod with #18 030412 1-1/2" (3.81 cm) stainless steel worm clamp
hole drilled mid point 290326 Warning label
MN7 Impedance Matching Assembly 902428 Jumper Strap
11 010011 8-32 stainless steel hex nut 902832 0.100" x 49" (.25 x 124 cm) stainless steel rod with
26 190026 = 7/8" (2.22 cm) formed aluminum bracket with #8 hole ball tip one end
28 190028 = Aluminum half washer
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