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VHF Broadband Amplifier



High Frequency Amplifier 3 MHz to 300 MHz
Gain 27.3 dB ± 0.3 dB @ 50 MHz
Gain Ripple < ± 1.0 dB
Output Power > 20 dBm @ 1 dB compression
IP3 @ 100 MHz +36 dBm
Input Return Loss > 20 dB
Output Return Loss > 15 dB
Impedance 50 Ohms
Supply 11 to 17 Volts @ 155 mA
Box Dimensions 63.5 mm x 50 mm x 30.5 mm
From GBP £32.66 + Connectors
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  A Very High Frequency, +20 dBm, Amplifier built in an Original size FLEXI-BOX screened enclosure



INPUT   [Photograph of VHF Amplifier Box showing connectors]  OUTPUT



The price of the VHF Amplifier in an Original Size FLEXI-BOX is dependant on the connectors required. To find the price for your connector preference or to make a purchase, select your connector requirements in the boxes beside the photograph above and then hit "Add to Cart".


  This amplifier is the first of a series built in the Original Size FLEXI-BOX and has both supply regulation and output circuit protection. The three stage amplifier gives an output of greater than +20 dBm (100mW) at 1dB compression right across the band of 3 MHz to 300 MHz. The amplifier does perform well down to about 50 KHz but is not tested in production to less than 300 KHz. The dc supply can be from +11.0 Volts to +17.0 Volts @ 155 mA and so the amplifier can be powered from a radio hams +13.8 Volt system. The RF connectors can be selected from BNC, N, SMA and TNC. Other connector types could be fitted if required in quantity and we are always interested to know what other types are wanted. So, if you would like another type please contact us and let us know.

  The amplifier is referred to as being an VHF amplifier but it can be seen in Figures 1 and 2 that the frequency response goes lower than the VHF band and it could also be used for HF.

[Graph of VHF amplifier gain]

[Graph of VHF amplifier input and output return loss]

  The isolation S12, has been omitted because it is better than -55 dB from 3 MHz to 300 MHz and would cramp the scale of the other measurements.

  The above results were obtained with SMA connectors and the performance will most probably be marginaly inferior with any other type fitted.