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--- skyperdescription [2018/10/10 11:49]
df2et [Re-aligning the RF components]
+++ skyperdescription [2019/06/16 19:10]
dg5ffn
@@ Zeile 44: / Zeile 44: @@
 ==== Re-aligning the RF components ====
-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). 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. It should look like this when finished:
+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:
-{{ :skyper:skyper_align_lo.png?nolink&600 | Aligned LO }}
+{{ :skyper:skyper_alignment_points.jpg?direct&600 | Alignment pins and trimmers }}
+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:
+{{ :skyper:skyper_align_lo.png?direct&600 | Aligned LO }}
+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.
+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 =====
@@ Zeile 56: / Zeile 63: @@
 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 }}
+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 ====
@@ Zeile 65: / Zeile 75: @@
 {{ :skyper:upgrom.jpg?direct&600 |}}
+===== Removing the display from the case =====
+The display is mounted in the case with clips. You can use a small screwdriver to *carefully* pull away the case from the display and lift the display (each side after each other)
+{{ :skyper:skyperoeffen0.jpg?400 |}}
+{{ :skyper:skyperoeffen1.jpg?400 |}}
+{{ :skyper:skyperoeffen2.jpg?400 |}}
+{{ :skyper:skyperoeffen3.jpg?400 |}}
+{{ :skyper:skyperoeffen4.jpg?400 |}}
+Photos courtesy DK7TD
+===== Preset of display contrast =====
+Have you ever asked yourself what this tiny trimpot on the rear side of the display board does?
+Well if your display is working fine and contrast setting can be done via setup menu there is
+probably no need to.
+The initial setting was done by the manufacturer and normally this should work all right.
+In case you have trouble with your display contrast it may be helpful to check this alignment according to the picture shown below.
+Turning this trimpot clockwise will increase display contrast while turning counterclockwise will decrease it.
+Please be aware that this is a very coarse setting. This SMD-trimpot has no upper or lower limitations. It can be turned around the full 360 deg.
+The fine adjustment is done afterwards in the Skyper setup menu using the up and down keys.
+{{:p4240071.jpg|}}
+===== Separating the display board from the case =====
+In case you have trouble with the silicone rubber keyboard or with the microswitches underneath
+you may want to take display board and case of your Skyper apart.
+Another reason to do this may be that you want to clean the display and case from the inside.
+{{:p6160003y.jpg|}}
+Of course you can do this like DK7TD describes it using a small screwdriver.
+If you are unlucky you may end up with a display where some lines of pixels are missing
+when you power up your Skyper afterwards.
+The reason is that while pulling out the display board this way the flexible board connector
+may move and some pins can get loose.
+Should this happen there is no way to fix this.
+{{:p6160026y.jpg|}}
+{{:p6160081z.jpg|}}
+{{:p6160091y.jpg|}}
+{{:p6160079y.jpg|}}
+{{:smd_kurzhub_mikroschalter.jpg|}}

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