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principles projects CNMI-Guam old projects |
MK3RXAssemblyCrx-8 -plate receiver (translated from Spanish original)
The plates are assembled on which the 8 crx cards will be placed. (Be careful with these plates because they can break if force is applied at certain points). The plates are going to be joined with 4 screws in the center and a glue (network) is applied so that they do not come loose (this will be placed at the end of the screw, the excess is removed). We must ensure that the two plates are even because above this anger the first plate with the antenna numbering (analog back plane) and it is important that they are even the bottom plates (preferably on a flat surface, it does not matter if the tabs are not at the same level, the important thing is that the top is at the same level.        The first plate (analog black plane) is placed and on top of that the other plate is placed (LO back plane). To this plate we have to put the pins of the jumper, one is placed first and then others and on those the card will be soldered (circuit).       The two plates are screwed to the base with 10 screws. Between the two plates are placed black spacers a single washer so that the connectors to the upper and lower plates are aligned. After installation, but thread lock onto the screws from underneath. Before putting the plate to the aluminum structure, you must check the length of the screws, so that they are not touching the bottom of the structure. At the end of the screw the glue (blue) is applied and excesses are cleaned. Note = the screws on the edge of the plate are shorter.       Connect coaxial cables Before connecting the coaxial cables of the crx-8 plates to the antenna connectors, the liquid should be applied to clean connectors (contac lubricam) in order to avoid corroding (it should be applied a little more, avoid excesses) . It should also be put on the connectors where you can get noise like the scsi and the jumper.     Power distribution supplies To have the complete plates of the vicor board the first thing that was done was to solder a resistance to the circuit and later a vicor module (v28c15c100bl) was incorporated in the lower part and the pins were soldered in the circuit, it is important that the welding cover the pin center and pass through the center of the pin to the bottom of the plate. The output of the plate must be 12.5 volts. (note = if we use 8 channels we will use 2 of these board and if we have 4 channels we use 1). Also, screw the little screws on the green connectors all the way in so they do not fall off.          These circuits are put in turn in another base that is installed in the large structure (box), at the base of the vicor module a glue is applied and it is spread all over the base of this before putting it in the base, it is to ensure that the entrance of the vicor board that is being installed is on the correct side where it is going to connect with the input terminal board, in the holes where the vicor board is to be screwed, blue glue is applied. To install it is placed at the base of the vicor module on the other base and the base is moved a little to spread the pagemento but only a little.    In the lower part of the base is applied glue and in the heat had (barilla) also before inserting in the orifices (if two plates are used also two heat pipes are used, care must be taken to install the correct side tuvos of heat). In the lower part of the plate glue is spread trying to cover where are the heat tuvos and part of the plate, also draw a square where the plate will go in the structure and also add glue. (NOTE = it is important that when the whole plate is installed in the structure it does not have the input card terminal because with the screw of the structure it does not fit well, so first the plate is placed in the structure and blue glue is applied to it. screw and then the input terminal card will be installed). You must clean excess glue. And they are going to put additional screws because the glue was coming out to the top of the plate.         After everything is installed on the board, two cables will be connected per board between the vicor board and the input terminal board (if it has 8 channels, there will be 2 vicor board so 4 cables will be connected between the vicor board and the input terminal card). The black wire will always go in the row above (-) and the red in the row below (+), can be connected in any of the screws does not matter, except for the first one that corresponds to the ground in the input terminal, on the vicor board in the same way it is corroborated that the black wire is in the screw that says (-) and the red in which it says (+).   On the other hand, at the output of the vicor board another 11 "cable is connected (make sure that black is on (-) and red on (+)) that goes to the power distribution. if you have 2 vicor plate there will be two cables that go to the power distribution plate, but if you have only one vicor in the same way you need the two cables, only in the vicor the two cables will be connected in the same place but in the power distribution anger connected as if we had two vicor plate).   Antenna adapters (connector plate) The type M power connector (VHF connector) was installed in the lower right (for this the size of the hole had to be enlarged to 7.2 mm (confirm measurement)). To place the connector it put a nut, a guacha and an O-ring on the bottom (out) and on the top (in) a guacha and a nut. Later in the holes of the upper part we installed connectors type SMA to type N and in 3 holes of the lower left row (nut, guacha, plate in the upper part). to adjust kegs use 19 mm and 18 mm keys, so they are aligned. Note = if only 4 channels are used, black plugs are placed on the channels that are not going to be used.     In the other two holes a gray plastic pressure plug was placed (it is placed towards the lower part (out)), before placing them with the deburring, the hole was softened and silicon (Heavy Duty silicone) was applied to lubricate them.    Before installing the plate in the structure (box) apply blue glue in the screw holes (so that it does not loosen over time). Next to the connector plate another square plate is installed, before screwing it, blue glue was applied in the holes for the screws.   DDS plate -d-tacq The entire d-tacq plate is installed on a structure that in turn is installed on the large box of the RX. Before installing the dtacq, the fans and other plugs are installed: First, 4 black buffers were installed in the base, blue glue was applied to the thread and only turned over. After where the fans are going to be installed, first the deburring hole must be softened and also the holes where the screws that hold the fan go. They also added silicone to these holes. The small fan is installed, for this 4 screws are used (black as rubber), you must apply silicon to the tip of the screws before putting it in the structure.    To the large fan you should add an extension of 15 cm because the cable is very small. This is installed just like the small one but blue screws are applied and the same silicone is applied. the cables should be twisted to avoid noise before finishing them by putting the connector. To put the connector we have to be very careful where the black wire goes and where the red wire, it is holding the connector and it is pressed with a special tool.     Subsequently to this same structure where the fans were placed, LO plates and power supplies board will be installed. 4 screws are used to install the power supplies board (3 mm * 0.5 mm * 10mm) and washers, but before that blue glue was applied. In the power supplies board we can manage if we want them to be active or passive antennas (if we put the jumper it should turn on blue lights in the crx-8 which means that we are working with active antennas) or with the jumper in the crx-8 as It was done normally.     The power supplies board connects the two cables that come out of the bicor board in the connectors on the left side (looking at the front of the board there are 5 white connectors, it connects in the first one below and in the third one going up), no matter which of the cables connect first. The cable that leaves the reciver board (CRX-8, Rx power)) is also connected to the white connector on the top right (white connector with 8 spaces). The fans are also connected to this board (there are 3 fans, in the center of the card (black connectors)) and finally the dtacq is connected to the connector on the top right (on the edge of the board says D-tacq ).     The distribution plate connects with the dtacq with the cables and with the crx (cables I and Q)    The first thing to do is remove the 2 screws from the dtacq protective cap (these two screws are discarded because they are not made of stainless steel). Then the dtacq crystal was installed. In this step it is necessary to corroborate that the serial number of the crystal corresponds to the serial number of the structure (box) of the Rx. In addition, you must be very careful when installing the glass on the plate, you must observe the shape of the glass and the groove, to match correctly (it has 3 round corners and a dotted corner), if the glass is properly installed it will sound a small click when you press on it (handle carefully is fragile). The earth wire 12 "is added to the dtacq." For the dtacq, you have to use screws different from the others and you put blue glue to put it in the structure that goes in the box (it connects in the upper right).       Later the Bell was installed.  Structure In the structure we first assemble the antenna antenna connector plate (plate connector) then the power distribution. Then the reciver plate is assembled and then the DDS, and finally the plate that has a fan. To install the reciver plate put 8 washers (2 down and 2 up, left 2 in the middle) and put super glue to the washer first, so that it is stuck to the structure and now if you put on the receiver plate.      On the DDS board, 4 screws are placed (in the one on the lower right side (looking at the front of the plate, next to the small fan) the earth of the d-tacq is connected), and in the one on the upper right side it is puts a guacha with super glue that connects the DDS plate and the fan plate.   The earth of the power distribution supplies is connected at the bottom left connected with an extension.   The power cable is connected to the input terminal board (black (-) and red (+)).   Cables red and black. To make them, 11 '' cables will be cut to connect the vicor plate and input terminal board, to make them use the clamps (black with blue) and first the bottom part will be put in 20 or until the bottom and the one on the top has to go to the left and cut the cable, then the second one is going to be the one on the bottom and then the top one on the right and I'll return one and short one. then I put thermophilic and then I put the connector that is in and and I tighten with the red clips. We need to remove RDOWN in Power Distribution Board to make CRX work |