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alphapocwatchdescription
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alphapocwatchdescription [2023/02/09 15:43] on6rf |
alphapocwatchdescription [2023/02/09 15:48] on6rf |
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| {{ ::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. }} | ||
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| + | ===== 3D Printed Clip ===== | ||
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| + | 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 ===== | ||
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| - 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. | ||
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| 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.txt · Zuletzt geändert: 2023/02/09 15:48 von on6rf
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