Dominique F1FRV har en hemsida http://f1frv.free.fr som är väl värd att besöka trots en blandning av engelska och franska.
Sidan innehåller många bra projekt kring linjära slutsteg. Sidan innehåller även annat matnyttigt för den byggande amatören. Där finns även en tekniska avdelning med många bra beskrivningar och även länkar till andra amatörers hemsidor.
För den som vill bygga ett rörsteg med triod eller tetrod och förenkla bygget så har han tagit fram färdiga kretskort för att förenkla slutstegsbygget.
Några av funktionerna som man erhåller är följande:
- Switched and fused mains outlets for heaters, auxiliary and antenna relays power supplies.
- Tubes heaters “soft start” to limit inrush current and extend tubes life.
- Start-up timer to allows for tubes heating ~ 3minutes before being ready to operate.
- Blower delayed stop, after amplifier switch off ~ 3 minutes, to evacuate accumulated heat in tube. Blower protection fuses for operator safety, as blower is not switched by amplifier on-off switch.
- All board inlets and outlets by screwed terminal blocks and IDCs with flat ribbon cables.
- Cathode control via fast opto-isolator.
- Cathode adjustable bias voltage regulation circuit, from 3 to 55 V bias, with protective devices.
- Grid & plate current meters shunts and dividers, High voltage meter.
- PTT logic timers to avoid “hot switching” and perform controled sequences during transmit-receive operations. This circuit allows also for RX preamplifier control.
- Tubes heaters “soft start” to limit inrush current and extend tubes life.
- Start-up timer to allows for tubes heating ~ 3minutes before being ready to operate.
- Blower delayed stop, after amplifier switch off ~ 3 minutes, to evacuate accumulated heat in tube. Blower protection fuses for operator safety, as blower is not switched by amplifier on-off switch.
- All board inlets and outlets by screwed terminal blocks and IDCs with flat ribbon cables.
- Cathode control via fast opto-isolator.
- Cathode adjustable bias voltage regulation circuit, from 3 to 55 V bias, with protective devices.
- Grid & plate current meters shunts and dividers, High voltage meter.
- PTT logic timers to avoid “hot switching” and perform controled sequences during transmit-receive operations. This circuit allows also for RX preamplifier control.