Benutzer-Werkzeuge
alphapocwatchdescription
Unterschiede
Hier werden die Unterschiede zwischen zwei Versionen angezeigt.
| Beide Seiten der vorigen Revision Vorhergehende Überarbeitung Nächste Überarbeitung | Vorhergehende Überarbeitung | ||
|
alphapocwatchdescription [2023/02/09 15:43] on6rf |
alphapocwatchdescription [2023/02/09 15:48] (aktuell) on6rf |
||
|---|---|---|---|
| Zeile 2: | Zeile 2: | ||
| ===== Overview ===== | ===== Overview ===== | ||
| - | This Alphapoc is quite similar to the 602R, both in construction and in internal structure. Most of the user interface is the same as the 602, and it can be programmed with the same software, and the same programming dongle. | + | This Alphapoc is quite similar to the [[alphapocdescription|602R]], both in construction and in internal structure. Most of the user interface is the same as the 602, and it can be programmed with the same software, and the same programming dongle. |
| {{ ::alphapoc:alphapoc801w_general.jpg?direct&600 |Image of Alphapoc 801W, next to the 602 and a Swissphone pager. }} | {{ ::alphapoc:alphapoc801w_general.jpg?direct&600 |Image of Alphapoc 801W, next to the 602 and a Swissphone pager. }} | ||
| + | |||
| + | |||
| + | ===== 3D Printed Clip ===== | ||
| + | |||
| + | As I wouldn't see too many people wearing this as a watch, I designed a small belt clip. You must remove the wrist straps with a small needle (poke it through the holes on either sides of the pagers, where the straps are attached, they're springy attachments). | ||
| + | Here is the file: [[https://mega.nz/file/QiQw0TIZ#IbtxRbmuiAk0SMpPUJDhVbB0NOUbmCqYmOtqBz5UVj8|Watch pager belt clip]] | ||
| ===== UHF Ham Mod ===== | ===== UHF Ham Mod ===== | ||
| Zeile 20: | Zeile 26: | ||
| - Replace capacitor marked 1 with a 6.8pF one. | - Replace capacitor marked 1 with a 6.8pF one. | ||
| - Turn the pager on. | - Turn the pager on. | ||
| - | - Place a probe on 2 (I used an 80MHz oscilloscope probe, ground on the USB connector) connected to a spectrum analyser, central freq 21.4MHz, span 30kHz. An SDR might just do the trick, careful about the input protection though! | + | - Place a probe on 2, IF filter input (I used an 80MHz oscilloscope probe, ground on the USB connector) connected to a spectrum analyser, central freq 21.4MHz, span 30kHz. An SDR might just do the trick, careful about the input protection though! |
| - Key in a POCSAG transmitter to a 600Hz tone (the test button is quite handy on unipager). Lowering the power might also be a good idea to avoid saturating the receiver. | - Key in a POCSAG transmitter to a 600Hz tone (the test button is quite handy on unipager). Lowering the power might also be a good idea to avoid saturating the receiver. | ||
| - The two POCSAG peaks should show up. Adjust trimmer numbered 3 for maximum signal strength. I really recommend a plastic screwdriver as a metal one will always detune the Rx antenna. | - The two POCSAG peaks should show up. Adjust trimmer numbered 3 for maximum signal strength. I really recommend a plastic screwdriver as a metal one will always detune the Rx antenna. | ||
| Zeile 27: | Zeile 33: | ||
| IF and ONLY IF there is absolutely no signal being received, the PLL might not be locking. I found adjusting trimmer 5 helps, but it's very sensitive and can sometimes make matters worse! | IF and ONLY IF there is absolutely no signal being received, the PLL might not be locking. I found adjusting trimmer 5 helps, but it's very sensitive and can sometimes make matters worse! | ||
| + | {{ ::alphapoc:alphapoc801w_ham_spectrum.jpg?direct&600 |Image of Alphapoc 801W open, with spectrum analyser showing the two Rx peaks on the IF }} | ||
alphapocwatchdescription.1675953784.txt.gz · Zuletzt geändert: 2023/02/09 15:43 von on6rf
Seiten-Werkzeuge
Falls nicht anders bezeichnet, ist der Inhalt dieses Wikis unter der folgenden Lizenz veröffentlicht: CC Attribution-Share Alike 4.0 International
