The funny thing is if I do this with the right hand points the drop is only 3 1/2 thou in the middle. When I continue to the end of the high part they are at the same size as at the scribe mark. If I set the left hand points at the scribe mark and then turn the engine so that the heel is half way along the length of the high part of the cam the gap reduces by 6 thou. With the timing set correctly with a strobe there is a large difference in the points gaps. This wiki page has more details of how to repair a broken tuner and details of an add on PCB with a DC current limited supply.My auto advance doesn't run true. The cause is inevitably an open circuit inductor (L101 or L102) after the output has been accidently short circuited. Once you are satisfied the voltage levels are correct and there is no smoke, you need to connect your hardware up to a Raspberry Pi4 Ryde receiver or a PC running the MiniTioune software.įull details including how to set up the MiniTiouner software, drivers and decoders is on the MiniTioune software page.Īpart from the the version 1 PCB with adaptor card, this version 2 PCB with Serit tuner is the only available solution to receive and decode DVB-S2 reduced bandwidth modes - this picture shows G0MJW receiving G8GTZ/P 1920*1080 HD pictures on 146 MHz using 32 APSK (approximately 1.3 mbit/s in 550 KHz bandwidth).Ī number of people on the BATC forum have reported their Serit tuners are no longer outputting the LNB voltage from one of the F sockets. File:NIM tuner.zip Testing and using the MiniTiouner for the first time If you obtained your module from elsewhere or you need to reprogram it it follow the instructions here The template xml file for the MiniTiouner is available as a zipped file for download here. With the DC-DC converter, the copper area on the board seems to be adequate as a heatsink.ĭo not allow too much strain to be exerted on the USB socket - at least one has been known to dislodge during use.Ī small modification must be carried out before this version 2 hardware can be used with the MiniTiouner version 0.8 (Spring 2018) or any later versions.Ī resistor between 5.6k and 12k must be fitted between CN2 Pin 19 on the USB module (U6 on the BATC PCB) and ground as shown in the pictures by G7JTT and M1EGI.Īll USB modules sold by the BATC shop are ready programmed and you do NOT need to reprogram it. If you don't use the DC-DC converter and run directly off an external 5V (DO NOT connect a higher voltage) supply to JP2, you may need to heatsink the regulators. This is easy as you can probe the top of the RFCs to measure them. We recommend that you build and then test all the voltage rails BEFORE fitting the NIM. The other is to remember not to fit the jumper JP2, ALT 4V that connects it to the regulators and set it up in commissioning. There are two options, one is to set the correct converter voltage before its installed on the PCB. There is a Zener to provide some protection but damage is still possible and worst case you could end up with whatever is on the input appearing at the output - i.e. This is because these LDO regulators can only handle a maximum of 6V input. There is not much to set up but before connecting the DC-DC converter to the input of the linear regulators, the output MUST be set to 3.7-4V output. Linear regulators and extensive filtering are used to ensure low noise for maximum RF performance. Optionally a 3.7-5.5V supply can be used instead, bypassing the converter Three low drop out linear voltage regulators are used to regulate the digital 3.3V and 1.2V and analogue 3.3V supply rails. Using a switching converter significantly reduces the generated heat. The design uses a MP1584 buck converter step down module to reduce the input, which can be in the range 6-20V down to 4V. The blank PCB, tuner, USB module and 1 volt regulator are available from the BATC shop The recommended type is available from ebay - search for "MP1584 step down buck regulator". The small regulator module is used to reduce the 12V input down to 5V to reduce power dissipation in the linear regulators. Note the 22uF electrolytic capacitors on the regulators are low ESR types chosen to minimise oscillation - substitute at your peril! Ceramics can be used instead but through hole 22uF ceramics are expensive. The parts list and schematic are available for download here: This pdf includes a Panel layout for the Hammond Box. Mike, G0MJW, has written an excellent guide on building and testing the board - download them here Notes on building the BATC v2 Minitiouner. The PCB has been developed to fit snuggly inside a Hammond 1455 series 103x120x53mm enclosure and uses standard leaded components so no specialist techniques needed. 6 Testing and using the MiniTiouner for the first time.1 Building the Version 2 MiniTiouner PCB.
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