Related Manuals for RADIOHAUS RH-DX640
Summary of Contents for RADIOHAUS RH-DX640
- Page 1 ASSEMBLING & INSTRUCTIONS MANUAL Antena RH-DX640 Cobweb Antenna for portable or base station operation in 6, 10, 12, 15, 17, 20, 30 and 40 meters...
- Page 2 2) Return the remainder of the wire so that it is adjusted according to the frequency of each band (above). Radiohaus Radiocomunicação 3) For the 40 meter band, if you need to reach a lower frequency, leave the end of the Rua Candelária, 672 | Centro | 13330-180 Indaiatuba, SP Brazil...
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Page 3: Technical Specifications
*MW and SW reception reception with goog efficiency COMMENTS The RH-DX640 antenna prototype was mounted on a roof, on a 3 meter (10 feet high mast). The antenna was tested on air for 60 days, suffering the effects of the weather such as sun, rain and wind. -
Page 4: Before Starting
BEFORE STARTING! Be careful not to overstretch each wire of the 10 to 40 meter bands when attaching the ends to the spacers so as not to stress This antenna is very light and can be easily assembled by one one the fiber structure. - Page 5 The table below shows measurements taken on our prototype. For each IDENTIFICATION OF THE PARTS INSIDE THE BOX band we have the smallest SWR obtained, and the bandwidth (BW) obtained with a SWR of 2:1 and 3:1. ( ) 4 telescopic fiberglass tubes (element arms) ( ) 1 Matching box with feed arm BAND Min.SWR...
- Page 6 ASSEMBLY ADJUSTMENTS 1. Central support bracket assembly Adjusting your Cobweb antenna is a process that requires a lot of ( ) Place the large mouting plate on a table or worktop. patience and time to get the best performance. ( ) Pass an M6 x 25mm bolt (small) into the center hole (A). Place an M6 flat washer over the bolt and tighten gently with a nut.
- Page 7 ( ) Connect a good quality 50 Ohm coaxial cable with the shortest ( ) Insert another 14 large hex bolts into the remaining holes. In the possible length between the antenna and the radio. Roll up a ba- place indicated with the circle (figure 3) insert a 21mm (27/32") lun on the coaxial cable itself, keeping the coils together with tube clamp.
- Page 8 ( ) Using a 10mm (3/8 inch) wrench securely tighten all hex bolts. ( ) Using the plastic tighteners, stretch the five ropes so that the ele- If necessary, lock the nuts in position using pliers. ments are slightly up. ( ) Note that the two L-shaped plates will be at the bottom and its ( ) In the case of the 6 meter antenna (the innermost one), align the four bolts also serve to fix two tube clamps.
- Page 9 2. Assembly of the Matching Box and antenna elements Figure 9 ( ) Take the feed arm and screw it firmly onto the matching box tu- be (figure 6). ( ) Insert this tube into the remaining tube clamp, so that the hole "A" faces the top.
- Page 10 ( ) Insert a nylon hex bolt in each of the two points "A" (figure 9) ( ) Connect both sides, respecting the identification. and secure with a nylon nut. Do not tighten too much to prevent ( ) Identify the 5-wire antenna pair (15, 17, 20, 30 and 40m) damage to the fiberglass.