| Zewnętrzna skrzynka antenowa SG-230 SGC Smartuner |
| http://www.g3ynh.info/atu/sgc230.html The SGC 230 'Smartuner'™ and its use in a balanced antenna configuration (An All-band HF antenna system for difficult EMC environments) by David Knight ™ 'Smartuner' is a registered trademark of SGC Inc. Outputs from current transformer T1 and voltage transformer T2 are rectified and combined to form an impedance bridge, which is balanced for 0V output when the impedance looking into the antenna coupler is 50Ω. T1 current sample, and a limited voltage sample from the line are also combined in a Mini-Circuits SBL-1 double-balanced mixer, to form a phase bridge which gives 0V output when the input to the coupler presents a resistive load. Positive going signals proportional to forward and reflected power are obtained from a directional coupler comprising T2 and T3. Frequency is sampled by limiting the signal from the line and applying it directly to the ripple-clock input of a 74LS93 counter. Mini-circuits znajduje sie w NY na Brooklyn i jest szczegolnie tanie.Mozecie bez problemu zamowic. A to jest co Amerykanie mysla o tym urzadzeniu: http://www.eham.net/reviews/detail/483 |