PAGERS
Sunday 21st May 2000
Some of my regular visitors may already be aware of my recent investigations into the tyre tread phenomena Please see my Tyre Tread Page, I have still not sorted that one out so the prize is still on offer!
More recently I have been plagued with Pagers on all WX satellite frequencies, it has got that bad that the images I do receive are not fit for publication, hence the lack of recent Latest Images.
Today decided to dust down my deerstalker and pipe and investigate this pager problem.
Normally up until recently I was only effected by pagers when receiving 137.85 presently Resurs, I have tried various antenna's and Receivers including RX2, PROscan, Cirkit with and without preamps but I could never get a clear signal on 137.85 I also tried resonant stubs and notch filters all to no avail, not to worry I thought! who needs Resurs anyway the images are not that good especially with the damaged instruments onboard, well now I wouldn't mind receiving any clear WX satellite signal, and before you say it no chance of HRPT unless I win the lottery.
I have spent a good part of the day monitoring both the WX satellite frequencies and the pager frequencies, one of the things that became clear was the fact that I was not dealing with one pager frequency but two and the odd thing is that something is not what it should be please see the tables below.
The Vodazap Pagers don't appear to give me any problems but the Ex Mercury Pagers have suddenly increased power so much that they even interfere with the other Pager frequencies, I wonder if pager users have recently noticed that messages are sometimes garbled? I did decode the signals using Pocsag32 (purely for research I must add)
I am not sure on my next course of action or if their is one but no doubt I won't give up.
Any constructive remarks are welcome, please note that these investigations were taken today (Sunday) considered to be one of the quieter days for pagers
So it's over to you Watson!!!
Interesting news (dated Friday, 26 January 2001) from the BBC regarding the future of pagers Click Here
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Pager Frequencies. Interference Yes/No |
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| Satellite Frequency |
137.975 |
138.075 |
138.1500 |
138.175 |
|
137.30Mhz |
Yes |
No |
No | No |
|
137.40Mhz |
Yes |
No | No | No |
|
137.50Mhz |
No |
No | No | Yes |
|
137.62Mhz |
Yes |
No | No | No |
|
137.85Mhz |
No |
No | No | Yes |
| 137.9750 | Nationwide Page One (Ex Mercury) Ch2 | 153.3375 | Nationwide Paging |
| 138.0750 | Vodazap | 153.3500 | Nationwide Page One (Ex Mercury) Ch3 |
| 138.1500 | Vodazap | 153.3625 | Nationwide Paging |
| 138.1750 | Nationwide Page One (Ex Mercury) Ch1 | 153.3750 | Nationwide Paging |
| 153.0750 | Nationwide Paging | 153.4500 | Nationwide Paging |
| 153.1250 | Nationwide BT Pagers | 153.8250 | Northern Ireland Air Page |
| 153.1500 | Nationwide BT Pagers | 454.0750 | Nationwide Aircall Voice |
| 153.1750 | Nationwide BT Pagers | 454.2000 | Nationwide Medical Pagers |
| 153.2250 | Nationwide BT Pagers | 454.2375 | Northern Ireland Hospitals |
| 153.2375 | Nationwide Paging | 454.6750 | Nationwide Millicomm Paging |
| 153.2500 | Vodazap | 454.7750 | Nationwide Aircall Paging |
| 153.2750 | Nationwide Aircall Comms | 454.8250 | Nationwide PageBoy Paging |
| 153.3250 | Nationwide Aircall Comms | 466.0750 | Nationwide Hutchison Paging |
Technical Parameters
The Radio Frequency carrier spacing in the frequency band of operation is required to be 25 kHz
The maximum ERP for POCSAG national systems is 100 Watts.
The maximum ERP for ERMES national systems is 400 Watts.
The maximum ERP for POCSAG & ERMES regional systems is 25 Watts.
For more info on pagers and anything else
regarding the airwaves go to
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