antentopSince2 July

Ham Spirit
Free Choice

 

 

Free Antentop Amateur Open Book
Antentop Album
Antentop Survey

 

 

 

Antentop is FREE e-magazine devoted to Antennas and Amateur Radio an

Special page devoted to

RW3XA’s 9 Band HF Vertical Antenna

Custom Search

 

ANTENTOP- 01- 2005, # 007

RW3XAs 9 Band HF Vertical Antenna

 

 

Fig.2. The basic unit

 

 

The design of the mast bearing is very similar to Obninsk high-altitude meteomast, which is put into operation in 1959 year, it's 310m high and the "ball" there is 1 meter in diameter. The given decision helps to neutralize mechanical resonance and vibration across the vertical tubing of the mast, wind loading is effectively extinguished. There're also 8 radials (4x21.5m, 4x10.6m) connected to the basic unit of the mast. There's also an aluminum die cast box near the basic unit sized 390x250x120 mm. This box includes matching network wiring. The relays are an anchor downwards type, i.e. in an inactive condition the anchor freely hangs between NO contacts. The relays controlled by UTP cable (network twisted pair) from two polarity power supplies 24V/1A (best choice for these military relay is 27V). To increase electric durability to the induced electricity all matching network circuits are galvanically connected to the ground. Because one the same matching network is used to match 14 and 21 MHz band, the left closing group of relay P5 is free (see fig.3), so it is used to switch a feed line over to another antenna. As mentioned before the 50-Ohm coax feed line can be of random length
 

 

Obninsk Meteomast

 

 

http://www.antentop.org/

Page 34

 

32 33 34 35 36 37 38 39 40 41

 

QRP Transceivers and PA from Accessible Parts IP for QRP Antentop Book Radio Antenna Engineering Book Antentop Printed and e- magazines
 


 

 

Just for Fun:

Map IP Address
Powered byIP2Location.com

Thanks for your time!

Last Updated:

August 3, 2016 16:40

Antentop Home Page

Free Antentop Open Book