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RX - RX preamp BOX
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!Settings * Variable Attenuator and RF protections: ** from 0 to about 18 dB ** turn the ATT-TRIM (201) [https://remoteqth.com/img/ZAW/rx-preamp-box/wiki_att_850.png|noborder] * Transistor Bias current: ** disconnect jumper JP1 ** connect mA meter there (200 mA scale is fine) ** connect supply voltage you want - from 12 to 15 V ** turn the resistor trimmer R4 (BIAS) and set bias current you want - it should be from 60 to 85 mA - depends on application ** than connect jumper short back again [https://remoteqth.com/img/ZAW/rx-preamp-box/wiki_bias_850.png|noborder] * Power over coax : ** Short jumper to enable power preamp over coax - with DC voltage. ** If you use external power supply to internal DC connector, please DISCONNECT jumper JP4 - Coax PS [https://remoteqth.com/img/ZAW/rx-preamp-box/wiki_ps_bias_850.png|noborder]
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