K-721 tri-band shortwave antenna ， HF shortwave communications antennas ， HAM multiband shortwave communications antenna
The new improved version of the K-721 antenna used in all GB 304 hardware， using a dedicated K-50MV Barron Barron antenna VSWR less environmental impact is also smaller ， improved version of the K-721 affected smaller easier to set up and adjust ， larger diameter coil ， thicker diameter greater tolerance power ， Q value higher loss smaller oscillator also replaced four square ， using the tooth lug screws and gaskets to prevent poor contact ， K-50MV is specifically for the K-series multi-band antenna design dedicated Barron ( non- hollow Barron ) ， the purpose is to allow the antenna to achieve the best match impedance 50 ohms standing closest to the minimum ， this Valencia with 50 ohm load resistor connected to the measuring method is not the correct parameters， remember!
K-721 was developed 7M 14M 21M shortened three-band shortwave antenna ， is the base station antenna ， can also be used in the field to establish the station antennas ， horizontal V -shaped oblique leave erection . Efficiency can be positive with Diamond V antenna PK. With 10 m fiberglass telescopic rod can be quickly set up， the actual use of the three bands standing wave can be adjusted to 1.2 or less ， it is very easy to set up in a multi -band antenna .
The main parameters : 7M 14M 21M tri-band VSWR < 1.5 withstand power <SSB PEP 500W total length is approximately: 10 m oscillator using 19 GB of high quality core BVR 4 square multi-strand copper cable ultra-soft ， material strong enough tensile ! three bands full natural resonance ， no days with the use of tone . screws are 304 stainless steel screws， Barron fully waterproof structure can be set up long-term outdoor use .
All accessories:
Main accessories : K-50MG Barron one ; vibrator 6 ; adjusting the lines shall be 6 ; coil 4 ; insulation board three ; strengthen the tension plate four ， La Shengsuo buckle 2 ， Barron U-shaped retaining clip 2 .The antenna without pull rope
Temporary erection K-721 HF communications antenna :
A full set of K-721 uses a 4 square oscillator :
K Series antenna matching balun K-50MV:
Improved version of the larger diameter of the coil diameter smaller loss bolder :
Insulation board:
Transducer installation method :
