021 223 021 223  Home brew HF Tranceiver KWM-2H 2002.12. ~ 2003.12. Block Diagram 사용 회로는 KWM-2(A)회로를 기본으로 하고 각각의 발진기는 반도체 회로를 사용할 계획으로 기계식 부분을 전자식으로 많은 부분을 바꾸며 아날로그 방식이지만 디지털 디스플레이를 사용한다  1. 마이크 증폭부는 12AU7과 6C4를 사용 2. Mechanical Filter 는 USB/LSB 용 2개를 사용 3. BFO X-tal은 455KHz를 사용 4. 고주파 증폭(IF 포함)관은 복합관을 피하였음   1st Mic amp 5814A ½ 2nd Mic amp 5814A ½ Cath Fol 6C4WA Balance Modulator XMTR IF Amp 6DC6   1st XMTR Mixer 6060   2nd XMTR Mixer 6060   ALC 6BN8 ½ 6AL5   ①½ ①½ ②   ③   ④   ⑤   16⑪½   +200 +200 T+275 R+275  ↑ T+275 ↘       ↗ TR+275  ↘       ↗ T+275 -70 ↘        TR+275 -70      ↑ Tone OSC 1750Hz 2N2222A    BFO 455KHz 2N2222A*2   Mechanical Filter USB/LSB 455KHz VFO 2.7~2.2MHz (500KHz) 2N4416*2 2N2222A Variable IF Tuning T2 3.155~2.655 Band OSC PLL 3.5 ; 6.655 7  ; 10.155 14 ; 17.155 21 ; 24.155 28 ; 31.155 TX/RX RF Amp 6DC6 TX Driver 6CL6 PA 6146B *2       +18     +18      ⑥ ⑦ ⑧⑨       ↙    ↙       ↖ ↓ ↙       ↖  ↓     ↙ TR+275 T+275 T+275 T+275 RX AF Power amp 6EB8 ½ AF Voltage amp 6EB8 ½ Prod. Detctor 6BN8 ½ 2nd RCVR IF Amp 6DC6 1st RCVR IF Amp 6DC6   2nd RCVR Mixer 6BN8 ½  6AB4   1st RCVR Mixer 6AB4       ⑮½ ⑮½ ⑭½ ⑬ ⑫   ⑪⑪½   ⑩       +200 +200 R+275 R+275 R+275   R+275   R+275       ⑮ ; 30mA     AGC Rect 6BN8 ½ ⑭½   +200               RY : +26       PLL +12        Disp : +5

Z5                       ALC (16) 6AL5                     1st XMTR                       Mixer ④ 6060 2nd RCVR Mixer L14 / L13   TX Driver 6CL6   PA 6146B     Tank Circuit     ⑪ 6AB46BN8     ⑦   ⑧⑨           T2           6146B           IF BF TX/RX RF Amp L10                     ⑥ 6DC6                     L4           RX AFamp    Prod. Detctor XMTR IF Amp     1st RCVR Mixer T3       ⑮ 6EB8   ⑭ 6BN8 ③ 6DC6       ⑩ 6AB4             T5 T1     2nd XMTR                   AC6.3 AV18V Mixer ⑤ 6060               2nd RCVR IF Amp Balance Ttansformer                 ⑬ 6DC6 Modulator               VFO    L9 Cath Fol     Filter   PLL             ② 6C4WA                Freq. Counter   1st RCVR IF Amp Mic amp                     ⑫ 6DC6 ① 5814A               Front           Plate   Exciter Tunning   LOCK TUNE CW USB LSB  ONAIR  Ext.ref  ●   P.A. Tunning     Grid Meter       21.302,25 MHz       S Meter ALC         KWM-2H             AGC-F     CW     28       TX-STBY         USB     21 RF GAIN     MIC GAIN IF TUNNING LSB Main Dial 14   ON/OFF         TUNE     7 AF GAIN     MIC PHONE     LOCK     3.5     K_Fuc KEY OFF - RX - TRX

Rear                                                         ANT TX RY ALC   MIC / 500 KEY Band SW Power Jack               (from PM-2 type)

Tube List   TUBE Heater [mA] Total [A] Socket RX   ① 5814A *1 300 0.3 MT 9 pin   AF Amp ② 6C4WA *1 150 0.3 MT 7 pin 0.3 RF Mix. ⑩⑪ 6AB4 *2 150 0.3 MT 7 pin 0.3 AF, RF Amp ③⑥⑫⑬ 6DC6 *4 300 1.2 MT 7 pin 0.9 RF Amp, IF Amp ④⑤ 6060 *2 (ECC81) 300 0.6 MT 9 pin 0.6 RF Amp, Mixer ⑦ 6CL6 *1 (6677) 650 0.65 MT 9 pin   Power Driver ⑧⑨ 6146 *2 1125 2.25 GT 8 pin   Power ⑭ 6BN8 *1 600 1.2 MT 9 pin 1.2 Detector, Rect. ⑮ 6EB8 *1 (6GN8) 750 0.75 MT 9