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Paul TC

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    Working outside the industry
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    Consultant Systems Engineer in Telecommunications & Radio Systems now working in the NHS
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    MIET, BAPCO
  • Full Name
    Paul Corkrum

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    Ex - Swindon now further South & West

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  1. One possibility is that you are picking up an intermodulation frequency from the addition / subtraction of two signals that are close in frequency giving an output in the KHz range. Have you any other short range wireless devices in use as 868MHz is used for these. Link to intermod webpage
  2. One comment if using in a small number of rural areas, that the LTE radio site may be using satellite back haul which will add delays to the voice transmission in addition to any other latency in the solution.
  3. Also there is a limit to the time a mobile phone base station will still operate in a power outage, starting from 0 min, upwards.
  4. Paul TC

    Site Radio Advice

    Google the term "passive repeater". Simply an antenna in coverage connected to an antenna in the area where coverage is required by low loss coaxial cable. However, where the source radio is not a base station may be difficult to get it to work reliably.
  5. Th IET magazine published an article that suggested "black start" of the UK supply from total failure would take several days and longer if it failed first time.
  6. See https://en.wikipedia.org/wiki/MTPAS
  7. SMS text services are not an instant delivery, cross network can have long delays or even non-delivery. Having at one time dealt with international roaming on Mobile networks, the ways SMS text sending could fail are numerous. And where would you direct your text to, to ensure it got a response? Given that local 24/7 manned Police Stations are becoming rare items, you are dependent on the infra-structure at these stations providing a "running call" phone to control.
  8. The issue was that the mobile networks became overloaded with calls and call attempts at the base station level. The landline network can also be overloaded in a similar way, E.g., if too many calls are offered to a particular number that cannot accept them. For interest current Ofcom guidlines re VOIP Phones can be found here. Ofcom guidance document There is also a more general Ofcom consultation on telcos compliance with Security duties currently open. The webpage can be found here Consultation: General policy on ensuring compliance with security duties
  9. 146-148MHz could be a return link from a Hilltop site to a repeater station, not a mobile radio. - See Ringbell web page on HO Wireless Schemes
  10. Some years ago, (mid 1990's), attending a college course run at night and only two other courses in building, found that all the escape routes bar how we entered the building to 3rd floor were locked, probably to make a "quick finish" for the care-taking staff at 9.00 PM when we finished. A Duty Fire Officer attended that same night in response to someone's phone call, not sure with the changes in Fire Safety law since then, that it would elicit same response today.
  11. At my school, 3 x Junior HA board, with lengths of wood, some with slots to leave channels out of group fades, plus 4 rotary triac dimmers mounted in a box (used rubber bands to gang them), located on a gallery in the wings SL accessed by a ladder.
  12. Same type of school setting, allowed to do everything, use tallerscope, (and had to unearth the out riggers), wiring leads and lanterns, even built 8 foot high staging platform out of scaffold bits that we had lying around. True, in 1980's I was working with valve PMR transmitters / receivers, in 1990's I was working with Kilosteam Multiplexers & DEC Servers, 2000's, GSM (2G) phone networks, 2010, Command & Control Systems based on Win XP machines, all now technology that is either gone or going. 2020's, 4G LTE. There is a need to continually update skills, even in the profession you are working in, crossing between industries unless you are at CEO / Director level is difficult.
  13. One item of advice that comes up here in response to these queries, if you are looking at lighting, or technical theatre as a career, is that you should consider what qualifications you are aiming for, have they any value when you need to make that career change in your 30's ? Someone who loved lighting, but decided at 18 it was better as a hobby and got a job outside the industry.
  14. BT SDH Equipment on customers premises relied on the Customer connecting the alarm contacts of the PSU's including back up battery feed to a customer's local alarm system, no reporting back to BT. And the customer had to check the "replace by" date on the battery and request BT to replace it.
  15. Also assumes your provider of choice has power resilience after the connection leaves your control.
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