400 ~ 470 MHz ANTENNA TUNER

• Estimated cost : Rp 50.000 (USD 5)
• Condition : Homebrew, with all components available at locat market.

Personal review :

• Simple and easy to built.
• VSWR 1.0 ~ 1.5 with handling power up to 200 Watt.
• Low insertion loss 0.2 dB
• As a Low Pass Filter, thus reduce transmitter interference to adjacent TV channels.

1500 WATT, 430 ~ 450 MHz LINIER AMPLIFIER

• Estimated cost : Rp. 8.000.000 (USD 800)
• Condition : Homebrew

Personal review :

• Built from Rusian tube GS 31
• Power Input 10 ~ 50 Watt
• Power Output 1500 Watt maximum.
• Power output / emmision still good/stable after operated more than 500 hours.
• Easy to be modified to 800 MHz bandwith power output 800 Watt maximum.

50 ~ 950 MHz SPECTRUM ANALYZER

• Estimated cost : Rp. 300.000 (USD 30)
• Condition : Homebrew, with all components available at local market

Personal review :

• dual channels Osciloscope required.
• built from 2 pcs TV Tuners. (for spectrum analyzer and tracking generator respectively)
• Operating frequency : 40 ~ 100 MHz, 100 ~ 250 MHz, 400 ~ 950 MHz (depending TV tuner capabilities)
• Require more development to get better accuracy (additional band pass filter, etc)
• Simple and easy to build.
  

145 MHz / 435 MHz ANTENNA TUNER

• Estimated cost : Rp. 50.000 (USD 5)
• Condition : Homebrew with all components available on local market.

Personal review :

• Suitalbe for dual band transceiver.
• Adjustable frequency range 140 ~ 150 MHz, and 430 ~ 450 MHz
• Single input and single output with VSWR Input : 1.1 ~ 1.5 at 50 Ohm impedance.
• Power handling 50 Watt maximum, better capasitors will improve power handling
  

3 ~ 30 MHZ, 50 WATT POWER AMPLIFIER

• Estimated cost : Rp.200.000 (USD 20)
• Condition : Homebrew, with all components available at local market

Personal review :

• Broadband Linier RF amplifier from 3 ~ 30 MHz (FM, AM/SSB)
• Power input 50 mW ~ 1 Watt
• Power Output 50 Watt maximum at 12.5 VDC, 8 Amperes
• Power transistor 2 x 2SC1969
• very useful as portable booster for Remote control transmitter (below 40 MHz), 11m/27 MHz walkie talkie or Citizen Band, etc.
• Easy to build, no tune required, however additional filter might be required for permanent operation to avoid interference to TV.