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27.500mhz beacon from Thailand

27.500mhz beacon from Thailand

Postby Ken Potha » 07 Aug 2012, 10:46

new beacon 100mw, operate just 1transister and lowpass filter




more detail pls. visit:

http://www.153rt.com/index.php/topic,3547.0.html
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Re: 27.500mhz beacon from Thailand

Postby dx.digger » 20 Oct 2014, 04:12

Hi Ken
nice beacon project, seems to work well, is it operational yet? I would suggest 5Watts if possible.
I have also noticed a cw beacon on 26.965Mhz but its hard to decode due to A.M and FM signals mixed in.
I think your beacon could be very useful. what antenna would you use? Vertical Omni-derectional or horizontal dipole or yagi?
Cheers Ken
73 Mark
ʎɐqǝ uo pɹɐoqʎǝʞ ɐ ʎnq ı ǝɯıʇ ʇsɐן ǝɥʇ sı sıɥʇ

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Re: 27.500mhz beacon from Thailand

Postby qrz11 » 26 Oct 2014, 12:54

Hi Ken,

very nice project indeed. I also would suggest 3-5 Watts if possible.

Best 73s

Mike
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Re: 27.500mhz beacon from Thailand

Postby HEI91 » 14 Nov 2014, 21:45

Hi,

Is this beacon active yet? I would like to see if I can monitor it in Cape Town, South Africa.

What antenna is in use and what is the height of the antenna ? It would be nice if you could increase power to +/-12 watts. You can make use of a 2SC1969 which is relatively cheap Transistor with a half wave vertical antenna , then you will have a low angle of radiation in all directions. With 100mW output , you can use a 2SC2166 as a driver transistor. You can easily recover it from an old CB set. This is only a suggestion though , but I think it is an excellent idea and I thank you for your anticipation. A very reliable beacon in Cape Town is on 28.250 Mhz for propagation.

Best 73's :D
| President Madison Homebase | GE 3-5825A | GE 3-5814A | GE 3-5813B |
| Dragon CB-407 | Zetagi HP-201 SWR/Power Meter | Leson TW-232 Mic |
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