Anyone made a Directional Antenna

  1. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

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    I need to make/build a Directional Antenna, not looked into it yet, (gismo not arriving until August)

    It will need to work between 430-470MHz. I guess once set that could be narrowed down if it would increase sensitivity:dontknow:

    Its for a beacon transmitter.

    :waving:
     
  2. Dedicated 433MHz beams are freely available, but does the type approval permit directional aerials?
     
    Hopefuldave likes this.
  3. chriskelland Forum Supporter

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    252
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    England south west Oxfordshire
    It's either 70 cms ham band or PMR446. If it's 70 cms you should know enough to make or buy an aerial. If it's 446 your after, any aerial with gain is not permitted. Any directional aerial will have gain over a dipole. Go on, what's the new toy?
     
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  4. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

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  5. chriskelland Forum Supporter

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    England south west Oxfordshire
    Wallace likes this.
  6. eLuSiVeMiTe

    eLuSiVeMiTe Forum Supporter

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    Been a few decades since I went on a foxhunt.
    Good fun with the right crowd.
     
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  7. 500e

    500e Always buy fire insurance a flood is hard to start

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    Think the radio communications Agency would like to have a talk with users.
    Free running transmitters are a pain for licence holders causing untold trouble
     
    ajlelectronics likes this.
  8. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

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    I haven't bought a radio yet. (Its not for fox hunting.)
     
  9. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

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    I could tell you some stories, of when two RR and a van turned up at my unit trying to find what was interfering with our telecoms.
     
  10. Kayos

    Kayos Member

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    Theres so much interference from power supplies and wifi signals a small transmitter wont make any difference.
     
  11. chriskelland Forum Supporter

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    Location:
    England south west Oxfordshire
    Unfortunately thats true. LED lamp in shack adds S4-5 to QRM. some days QRM S7-8 makes 40 & 80 almost unusable.
     
  12. chriskelland Forum Supporter

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    Location:
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    Wonder why the fox was always in a pub car park?
     
  13. Ah, I didn't realise that you were licenced, there seem to be a few dark horses on here. :D
    You could use one of the commercial 70cm beams or I could lend you my VHF / UHF handbook for you to get some ideas.

    Not sure what you intend to do with it though? The OFCOM bods are quite strict about unattended transmitters but I'm sure that you know all about that!
     
  14. 500e

    500e Always buy fire insurance a flood is hard to start

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    Location:
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    Is it running in the 430 440Mhz ? it suggests 430 to 470Mhz, it seems to lock on a TX frequency of your choice in that band,
    We have on site customers within that spread that would not be happy budgies if their safety comms were interrupted by Morse bursts.
    As @chriskelland says The Jabberwocky being generated by non conforming equipment, LED lamp drivers, Switch mode power supply's, & non approved imported 2 way radios, to name but a few makes life a pain.
    Digital is all ok but there are drawbacks.
     
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  15. voipio Member

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    636
    Cambridge, UK
    Bear in mind that the primary user of this part of the spectrum is the military, with radio amateurs having a secondary allocation. Even if this device were to comply with regulations (it probably doesn't) it's use could attract unwanted attention.
     
  16. indy4x

    indy4x Forum Supporter

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    Possibly but why add to the spectrum noise

    Chris
    MW0YVT
     
  17. Shox Dr

    Shox Dr Chief Engineer to Carlos Fandango

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    Location:
    East Yorkshire
    Thanks for the advise. I’m sure to bear it in mind
     
  18. 500e

    500e Always buy fire insurance a flood is hard to start

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    Location:
    Somerset UK
  19. Blackolive

    Blackolive Member

    Messages:
    275
    uk lancs
    • 53D3324D-E9B3-47A2-AB9C-B599465889EF.jpeg
    • 23AEBDE0-EA8A-4A6B-BDCA-26B4AC399A82.jpeg
    Hopefuldave likes this.
  20. Blackolive

    Blackolive Member

    Messages:
    275
    uk lancs
    Worked a welsh Station with us both having antennas on the floor. Excuse me sounding like Fred Dibnah

     
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