Hier werden die Unterschiede zwischen zwei Versionen angezeigt.
Beide Seiten der vorigen Revision Vorhergehende Überarbeitung Nächste Überarbeitung | Vorhergehende Überarbeitung Nächste Überarbeitung Beide Seiten der Revision | ||
skyperdescription [2018/10/10 11:23] df2et |
skyperdescription [2018/10/10 11:57] df2et [Hardware] |
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{{:skyper:skyper_18pf_standard.jpg?direct&400|18pF on the bottom}} {{:skyper:skyper_15pf_standard.jpg?direct&400|15pF on top}} | {{:skyper:skyper_18pf_standard.jpg?direct&400|18pF on the bottom}} {{:skyper:skyper_15pf_standard.jpg?direct&400|15pF on top}} | ||
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+ | An alternative is to use SMD components (for a set see [[https://shop.funk24.net/weiteres.../skyper/287/quarz-fuer-skyper-mit-smd-kondensatoren|funk24.net]]). Those are easier to fit into the case but a little more challenging to solder. But there are nice tricks :-) | ||
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+ | The 18pF SMD capacitor on the bottom can be added to two SMD pads which are actually not in use. Those can be found between the "33" labelled component and a 560R SMD resistor. On the top there are no unused pads apparently. But you can put the 15pf capactor upright between the "R22J" component and a SMD capacitor next to it. Then solder the two pads to those of the already existing SMD capacitor. | ||
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+ | {{:skyper:skyper_18pf_smd.jpg?direct&400|18pF SMD on the bottom}} {{:skyper:skyper_15pf_smd.jpg?direct&400|15pF SMD on top}} | ||
==== Re-aligning the RF components ==== | ==== Re-aligning the RF components ==== | ||
- | FIXME | ||
+ | After changing the hardware the Skyper needs a realignment to make it work on the new frequency. First step is to realign the LO with the new crystal. You need a transmitter on the new working frequency (439.9875 MHz) transmitting a 600Hz tone to trigger the Skyper. An easy way is to use the test function of UniPager (connected to a RasPager board). This is an overview of pins and trimmers used for alignment: | ||
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+ | {{ :skyper:skyper_alignment_points.jpg?direct&600 | Alignment pins and trimmers }} | ||
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+ | Then you have to dig onto pin 16 of the receiver IC with a scope. You should see a more or less symmetrical signal. The goal is to align it to be symmetrical calibrating it with trimmer CT2. It should look like this when finished: | ||
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+ | {{ :skyper:skyper_align_lo.png?direct&600 | Aligned LO }} | ||
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+ | When this is finished you can improve reception by tuning the antenna circuit to maximum signal strength. Therefore conncect your scope to pin 12 and tune to maximum signal by turning trimmer CT1 carefully. | ||
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+ | If all is done your Skyper should receive messages from DAPNET network. You can test that using the "Send Message" function of UniPager which circumvents the DAPNET connection and sends out POCSAG calls directly. | ||
===== RIC programming ===== | ===== RIC programming ===== | ||
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You need an interface that supplies 3v0 to the pager to activate its programming mode. A small SMD PCB that fits into a DB9 connector case is described here: https://github.com/dk4pa/SKYPER_PROGRAMMER. Power is drawn from a USB port and converted to 3v0. A small amount of PCBs is available at cost from the authors. Please contact DK4PA or DF2ET. The Skyper has a programming interface which is located inside the battery compartment. It requires the wiring of GND, 3v0 as well as RX/TX lines. All experiments to build some sort of plug failed so far. Thus we normally solder the 4 wires to the pads after opening the case. | You need an interface that supplies 3v0 to the pager to activate its programming mode. A small SMD PCB that fits into a DB9 connector case is described here: https://github.com/dk4pa/SKYPER_PROGRAMMER. Power is drawn from a USB port and converted to 3v0. A small amount of PCBs is available at cost from the authors. Please contact DK4PA or DF2ET. The Skyper has a programming interface which is located inside the battery compartment. It requires the wiring of GND, 3v0 as well as RX/TX lines. All experiments to build some sort of plug failed so far. Thus we normally solder the 4 wires to the pads after opening the case. | ||
- | {{ :skyper:skyper_prog.jpg?direct&600 |}} | + | {{ :skyper:skyper_prog.jpg?direct&600 | Skyper Programmer }} |
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+ | The connection between programming interface mentioned above and Skyper are as follows: | ||
+ | {{ :skyper:skyper_progger_connection.jpg?direct&600 | Connection of progammer and Skyper }} | ||
==== Software ==== | ==== Software ==== | ||