D4C - UHF: Update on 1296MHz beacon project

“As anticipated in our post of 5th of August, we are continuously working in the project to bring to Cape Verde a 23 cm beacon on 1296.836 MHz that will join our .x36 beacon frequencies family.

HB9BCD Carlo’s current constructions is in the attached picture and consists in:

Oscillator-multiplier at 1296
The 108 MHz Oscillator is build in a cubic box. The quartz is maintained at a constant temperature of 60°C
The multiplier section is built in the two coppoer boxes. At this stage Pout is 200mW
Unwanted frequencies at -70dB

PA unit
Trials with a micro ldmos PTF4001 as amplifier give approx. 14dD of gain each module and a Pout max. between 15W to 20W.

We plan to use 3 pcs in order to obtain 2 separate outputs at 20W each .

Antenna 2x yagi 16el I0JXX kindly donated by HB9EFK Nick Steinbrücker are available. The have 14.46 dBd of gain each on

In Brasil almost no stations are QRV on 23cm. We accept suggestions were to point the second antenna to investigate if it necessaries at all. Otherwise we will put full power to Europe.

Initial ideas was to have 2 different directional antennas, one to Europe and the second to Caribbean area.

For the support on this new project we must thank HB9BCD Carlo Molteni and HB9EFK Nick Steinbrücker for the antennas, cables and power divider donation.

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