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27.500mhz beacon from Thailand

PostPosted: 07 Aug 2012, 09:46
by Ken Potha
new beacon 100mw, operate just 1transister and lowpass filter

more detail pls. visit:,3547.0.html

Re: 27.500mhz beacon from Thailand

PostPosted: 20 Oct 2014, 03:12
by dx.digger
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

Re: 27.500mhz beacon from Thailand

PostPosted: 26 Oct 2014, 11:54
by qrz11
Hi Ken,

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

Best 73s


Re: 27.500mhz beacon from Thailand

PostPosted: 14 Nov 2014, 20:45
by HEI91

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