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--- skyperdescription [2018/10/10 11:49]
df2et [Re-aligning the RF components]
+++ skyperdescription [2019/09/27 20:09]
dg1kmm Erläuterung, was bei einer leeren Batterie gelöscht wird; Kosmetik
@@ Zeile 3: / Zeile 3: @@
 {{::skyper:skyper2.jpg?direct&400 |}}
-These pagers normally come with a (more or less) hard-coded RIC. It can be found on a small label on the back side. It is not! the "Skyper Nr."  but the second part of the "ID Nr.". It is contains 7 digits of which the last four are underlined (has been used as a PIN in the former life of those units).
+These pagers normally come with a (more or less) hard-coded RIC. It can be found on a small label on the rear side. It is __not__ the "Skyper Nr."  but the second part of the "ID Nr." and consists of seven digits of which the last four are underlined (have been used as a PIN in the commercial Skyper service).
-These units support automatic time synchronisation to the DAPNET transmitter/core and rubric messages. The latter need an activation which can be sent out from the hampager portal (See "rubrics"). The rubrics abonnement is apparently lost if the battery dies.
+These units support automatic time synchronisation to the DAPNET transmitter/core as well as rubrics messages. The latter need an activation which can be sent out from the hampager portal (see "rubrics"); the activation is stored in non-volatile memory.
+The rubrics list, the rubrics contents and your individual rubrics subscription however are stored in SRAM and are lost if your battery runs out of power. If this happens, is not a serious problem - the rubrics list is periodically transmitted by the DAPNET core. Just wait until the Skyper has received the list (this may take several hours) and you are able to subscribe to the rubrics again.
 ===== Modification for UHF ham band use =====
@@ Zeile 44: / Zeile 45: @@
 ==== 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 64: @@
 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 76: @@
 {{ :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 =====
+Should 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
+or to replace a damaged Skyper case with a better one.
+{{:p6160003y.jpg|}}
+One straightforward way to do this is the one DK7TD describes using a small screwdriver.
+For an experienced user who knows what he's doing this can be the way to go.
+But there is some risk in it especially if you are doing this for the first time.
+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.
+What has happened? Please keep in mind that Skyper hardware is around 20 years old stuff.
+While pulling out the display board this way the flexible board connector
+atop of the LCD display may move and some pins can get loose.
+Should this ever happen there is no known way to fix it.
+{{:p6160026y.jpg|}}
+After experiencing this twice up to now (I have modified >20 Skyper) I asked myself:
+Is there a safer way to work on the display board?
+YES there is one.
+You can fix the LCD to the display board applying a few drops of 2K glue at the positions
+shown below.
+After hardening for some hours you can pull out the board using a simple smartphone
+opening tool at the two shown positions.
+One tool is enough - you don't need two of them.
+{{:p6160081z.jpg|}}
+{{:p6160091y.jpg|}}
+If you did the soldering and the modification on the RF board of your Skyper yourself
+it should be no problem for you to get the old microswitches out and new ones in.
+For me it was difficult to get them here in Germany. The dimensions are listed below.
+I found them on eBay. They are quite inexpensive even if you have to order 100 pcs in China.
+In my opinion its a good idea to replace all 4 microswitches even if only one
+is faulty. So the look and feel is the same on all 4 keys afterwards.
+{{:p6160079y.jpg|}}
+{{:smd_kurzhub_mikroschalter.jpg|}}

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