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F1VJT’s beacon MK2.
This is a simple 10 meter beacon based on a TTL oscillator and one PIC 16F84. The first version was very simple,the oscillator exciting directly the antenna by one relay : one great problem,the TTL oscillator are rich in harmonics,I mesured strongs signals in aviations,military and professional VHF band….not very good,my location is near the airport and I wouldn’t create interference. This version is made to offer more power without harmonics. I find an old Ericcson pager in 11 meter band,I take only the PA module with the Xtal oscillator,I removed the original Xo,the 2nd power module and it’s all ! The CW generator is with a 16F84 PIC,the original shematic is from IK0WRB (Thank you!). The original version working on 26.685 MHz with 5..7 Watt. Three years ago receive 511 from USA with the first beacon (10 mW),one OM wrote me an e-mail with the signal report and his working conditions….Great ! I think is not necessary more power,in E-sporadic condition,the 10 meter band is fantastic. In the photos can you see the beacon,I mesured 0.8 Watt in a dummy load,antenna are loaded ant the coaxial line are very short,about 40 centimetres. Now the harmonics are very weak,the power module is filtered and a good sinusoidal signal out. It working 24/24,it’s powered by a 12Volt power supply and one 12 Volt battery. The installation is in my appartements,I live at the last floor an the « «no gain antenna » is in my balcony. My location is JN33BC,my city is Hyeres,in the south east part of France. Please contact me by e-mail if you heard this beacon.
01/05/2009
Many thanks to DICOMABE,IK0WRB,IW1PRT,IZ1MKR and the E-sporadic !
F1VJT Alberto Mail to f1vjt@live.fr
The TX module
The antenna.....
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