It's possible to integrate your custom amp built-in BIAS AMP 2 into BIAS FX 2. It allows you to tweak and fully customize your own unique distortion, delay, or modulation pedal.) ( Bias Pedal: A pedal equivalent of the Bias Amp. It can be customized into your own unique amp, with an additional Amp Match feature. Also features things like Guitar Match, Looper, and more.īias Amp 2: In-depth tweakability for only the guitar/bass amp section. PIC Time Delay = 0.Below are the differences between each BIAS series product:īias FX 2: Wide variety of amps and effects, and allows very flexible configuration. Nop nop for port read/modify/write problem Initialise clear all outputs (except filter) to Rx stateīcf TR_relay turn off T/R relay after delay Repeat number of extra times freq is counted #define tC d'8' bandsw relay release timeĭelay1 misc counters for use in time delays #define tB d'15' bandsw relay operate time #define tA d'15' T/R relay operate delay time decimal #'s following equal time in mS (approx) _config _CP_OFF&_LVP_OFF&_BODEN_OFF&_MCLRE_OFF&_PWRTE_ON&_WDT_OFF&_INTOSC_OSC_NOCLKOUT Rearranged all other inputs/outputs to PortA. Ĝonverted to 16F628A running on internal oscillator. Remove changing variables using jumper method. Remove EEProm storage of variables - converted to tables. See RSGB Radcom magazine Sep to Dec 2001 Original code & hardware design by Peter Rhodes, BSc, G3XJP So far this system is working quit wellĪll will be populated all in one, so stay tuned for the final result …………. I am using this design with my 30w Mosfet and 300w LDMOS amplifiers. Instead of using an ULN2803, i am using an ULN2804 since my LPF are all using 12vdc relays I am using a 2P switch with a middle neutral position to cancel any RF input. A switch in order to switch the RF level input. Low level RF input (a simple tiny antenna is sufficient or few turns on a ferrite core) High level RF input (You can tap directly on your low power input from 1 to 5w) i wrap few turn on the core to achieve a RF sample to the PIC (You need to test according the core you are using) The final implementation i am using the Low level input with a ferrite core. All my tests and experimentation was performed with TINYSA, a NANOVNA or a SARK100 on the high level RF input. The main principle is RF detection during tuning and use the PIC as a frequency counter and switch. The main purpose of this circuit is to provide automatic band switching capabilities for LPF to any radio rig. More details and gerber files are here : This is the VK5TM’s design populated for easy implementation. Automatic band decoding with RF Detection Since i have this kind of relay, this is an easy integration for the opto relay output. The Menu is offering to adjust the Resistor Value. For R1 and R4 since i do not have 50R Resistor, i am using 47R 5w resistor. Using FT50-43 toroids and 5w 50ohm resistor, the SWR bridge able to handle up to 1KwĬurrently i am using MOSFET amplifier for 3 years with this kind of controller with another amplifier and working perfectly.įor VD Diodes, i am using BAT41 diodes or 1N5711.Since the power is about 50w, my adjusment is 100w which is tailoring the bargraph display accordingly. A dedicated menu to adjust the output power range you want to monitor.A dedicated menu for the Max SWR adjusment –> It will trigger the opto relay to cut-off the biasing.Current monitoring with a dedicated menu to adjust the max amp (Limitation) in order to cut-off the biasing with an opto relay when the current is too high.
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