7ANT Controller

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!Internal BPF and preamp PCB [https://remoteqth.com/img/ZAW-WIKI/k9-bidir-controller/internal-pcb/internal_pcb_web_850.png|noborder] !! Preamplifier GAIN * With the variable ATT you can set gain of the Preamp as you need. * Range is 0 to 17 dB * [bigger picture|https://remoteqth.com/img/ZAW-WIKI/k9-bidir-controller/internal-pcb/deska_red_1.png] [https://remoteqth.com/img/ZAW-WIKI/k9-bidir-controller/internal-pcb/deska_red_1-850.png|noborder] !! Preamplifier BIAS * With this trimmer you can set right bias for the transistor. * Bias vs IP3 and gain parameters are there: [OK2ZAW's blog spot|https://ok2zaw.blogspot.com/2015/09/rx-ant-switching-b-ox-part-2-preamp-ip3.html] * recomended bias is 60 to 85 mA for 13 V+ * [bigger picture|https://remoteqth.com/img/ZAW-WIKI/k9-bidir-controller/internal-pcb/deska_red_2.png] [https://remoteqth.com/img/ZAW-WIKI/k9-bidir-controller/internal-pcb/deska_red_2-850.png|noborder] !! BPF bypass * You can use one of three BPF (160, 80 or 40m) or you can ByPass it for wideband operation * Controller by switch on the front panel - number 4 on [controller|https://remoteqth.com/img/ZAW-WIKI/k9-bidir-controller/controller_k9ay_bi-dir_popisky_850.png] * [bigger picture|https://remoteqth.com/img/ZAW-WIKI/k9-bidir-controller/internal-pcb/deska_red_5.png] [https://remoteqth.com/img/ZAW-WIKI/k9-bidir-controller/internal-pcb/deska_red_5-850.png|noborder] !! BPF 160M * 160M BPF selected by controller. * Switch on the front panel - number 1 on [controller|https://remoteqth.com/img/ZAW-WIKI/k9-bidir-controller/controller_k9ay_bi-dir_popisky_850.png] * [bigger picture|https://remoteqth.com/img/ZAW-WIKI/k9-bidir-controller/internal-pcb/deska_red_8.png] [https://remoteqth.com/img/ZAW-WIKI/k9-bidir-controller/internal-pcb/deska_red_8-850.png|noborder] !! BPF 80M * 80M BPF selected by controller. * NOTCH filters are included, nulls 160 and 40m. * Switch on the front panel - number 2 on [controller|https://remoteqth.com/img/ZAW-WIKI/k9-bidir-controller/controller_k9ay_bi-dir_popisky_850.png] * [bigger picture|https://remoteqth.com/img/ZAW-WIKI/k9-bidir-controller/internal-pcb/deska_red_7.png] [https://remoteqth.com/img/ZAW-WIKI/k9-bidir-controller/internal-pcb/deska_red_7-850.png|noborder] !! BPF 40M * 40M BPF selected by controller. * NOTCH filter is included, nulls 80m. * Switch on the front panel - number 3 on [controller|https://remoteqth.com/img/ZAW-WIKI/k9-bidir-controller/controller_k9ay_bi-dir_popisky_850.png] * [bigger picture|https://remoteqth.com/img/ZAW-WIKI/k9-bidir-controller/internal-pcb/deska_red_6.png] [https://remoteqth.com/img/ZAW-WIKI/k9-bidir-controller/internal-pcb/deska_red_6-850.png|noborder]
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