Unterschiede

Hier werden die Unterschiede zwischen zwei Versionen angezeigt.

--- primodescription [2019/02/21 12:36] – [Removing the frontend filter] df2et
+++ primodescription [2022/01/11 17:09] (aktuell) – [Anleitung] do1goe
@@ Zeile 3: / Zeile 3: @@
 {{::primo:primo.jpg?direct&400 |}}
-These pagers were available in the former POCSAG net by Deutsche Telekom AG and later by e*message. The HF part of the receiver is identical to [[skyperdescription|Skypers]]. The modification for 439.9875 MHz is thus the same. The shortcome is that the display is much smaller and there is no built-in function for setting time and date autmatically. In addition the date only allows years up to (20)13 starting from (19)94 to be set. This has to be done by hand and is lost on longer absence of battery power.
+These pagers were available in the former POCSAG net by Deutsche Telekom AG and later by e*cityruf. The HF part of the receiver is identical to [[skyperdescription|Skypers]]. The modification for 439.9875 MHz is thus the same. The shortcome is that the display is much smaller and there is no built-in function for setting time and date automatically. In addition the date only allows years up to (20)13 starting from (19)94 to be set. This has to be done by hand and is lost on longer absence of battery power.
+Der Pager ist von der Firma NEC hergestellt. Modell: NEC PA4PY-20A
 ===== Modification for UHF ham band use =====
@@ Zeile 19: / Zeile 21: @@
 {{ :primo:primo_short_saw.jpg?direct&600 | Reconnected in- and output of removed SAW filter}}
+==== Exchanging the crystal ====
+Next is to exchange the crystal to get the LO to the correct frequency. You will need a crystal with 69.764583MHz to get the Primo working on the (German) centralized DAPNET frequency of 439.9875 MHz. To remove the old crystal you can remove solder with a desoldering pump.
+{{ :primo:primo_removed_crystal.jpg?direct&600 | Removed crystal}}
+The new crystal (from [[https://shop.funk24.net/weiteres.../skyper/286/quarz-fuer-skyper-zum-umbau-auf-amateurfunk|funk24.net]] for example) should be soldered to the two pads.
+{{ :primo:primo_new_crystal.jpg?direct&600 | New crystal}}
+==== Mounting additional capacitors ====
+To improve the LO you can add two capacitors. In my case I tried the pager without those and it worked out of the box. So this is skipped here for now.
+==== Re-aligning the RF components ====
+After the modification the pager needs to be realigned. 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).
+Different to Skypers you cannot power the pager from battery because this would need the case to be closed. So you may power the pager my an external 1.5V power supply to the pads on the PCB that are normally connected to the battery compartment.
+This is an overview of pins and trimmers used for alignment:
+{{ :primo:primo_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:
+{{ :primo:primo_aligned_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 Primo 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 =====
+The Primo pagers obviously share some similarities with Skypers.
+==== Reading programmed RICs ====
+If you just want to know which RIC(s) are programmed in your Primo pager there is a special key combination that was deteced by DK7DB. Turn the pager off and press "M" twice. It will show the programmed RICs 1 to 3.
+{{ :primo:primo_reading_ric_manually.jpg?600 |}}
+==== Hardware ====
+The connector on the display PCB is identical to the [[skyperdescription#hardware|interface found on Skypers]]. The connector looks as follows:
+{{ :primo:primo_progger_interface.jpg?direct&600 | Primo programming interface }}
+==== Software ====
+Using the same programmer as for Skypers ([[skyperdescription#hardware|linked here]]) you read at least read the RIC from the pager. After starting the software you have to load the correct .ROM file. In this case we used 20bd-a.rom and after pressing F1 to read the pager the correct RIC was displayed.
+{{ :primo:primo_reading_ric.jpg?direct&600 | Successfully read the RIC off a Primo pager }}
+Wrting the pager has not been tested as we are not sure if the .rom file is 100% correct yet.
+==== Anleitung ====
+Zum bedienen des Pagers ist eine Bedienungsanleitung bei "E*Cityruf" zu finden.
+https://www.emessage.de/ecityruf/service/bedienungsanleitung.php
+Hier die Bedienungsanleitung, die dem Primo mal bei lag:
+{{ :primo:primo_anleitung.pdf |}}