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Gday all,
Ive had a bit of a play with the pll board , with some interesting results.
Most have known for some time that the boards performance is closely tied with the performance of the 10Mhz reference. The ref. input of the  si4133 is fairly high impedance and is very susceptible to external noises (ie around the shack) so shielding looks to have some big benefits.

I have also discovered that there can be some noise improvments when the 10Mhz input is filtered!
My 10mhz reference is a very good, clean sine wave (isotemp oven oscillator) but even still, after filtering -the pll board shows remarkable improvement in noise.
Believe or not, I just soldered two sma connectors to a standard 10Mhz crystal and put this in series with the input (A very crude crystal filter?!!) I didnt have enough time to experiment with levels, after the crystal the 10Mhz was around -10dbm (into 50ohm)
I am going to experiment with some proper filters soon.
see photo (difference when filter is added)



See new Page "Low noise amplifier" for a preamp/small signal amplifier board Ive produced.

 1296(23cm) transverters are well under way and could be available very soon. Boards have been etched and are very compact (69mm X 45mm), component types/values and testing are still to be finallised.

 

Ive also been working on  a "Versitile" PA or driver  board (FR4 material for up to 3.4ghz) Ive have the board working well at 4watt 2.4ghz (fpd4000 device) and 1watt broadband 1296, 2400 and 3400 (fdp3000 device) with good gain.
Ive been having a lot of fun with this board (Ive allready had a batch etched!) Im interrested at seeing how many devices and how much power can be realised!!It may be a VERY handy driver stage or as a PA in its own right. The idea of the board is to cut the pcb (if needed)  to suit the device package, input and output matching (if needed) can usually be achieved with  shunt capacitors and/or series inductors (with a cut, ie LNA)  on the 50ohm lines.  there is an on-board negative bias generator to suit the majority of devices.

Some working designs should appear on the website soon.



 

Welcome to my new website,

Due to difficult availablity of info about my various RF (microwave) kits and boards I've started to create a Website!!
Please bare with me as im very new to all this. Documentation, layouts and photos will hopefully emerge over the coming weeks.


So far I have Transverter kits available for the  2.4Ghz, 3.4Ghz, 5.7Ghz and 10.368Ghz bands and a "versitile" PLL board.
I also have a PCB only 432Mhz transverter available.

The 2.4Ghz, 3.4Ghz, 5.7Ghz and 10Ghz kits contain transverter and multiplier pcb boards, components, sma/ mcx connectors and mounting plates (aluminium bases). Mounting screws are not supplied

The PLL boards are sent fully built  (tested for basic funtionality)

 
Im currently working on a very small 1296Mhz transverter,  PA boards, RX preamp boards and some various transverter "helpers".  hopefully ill be able to offer some new boards soon.


 VK3XDK 2.4Ghz Transverter kit (pll not in included in kit)Transverter Pallets VK3XDK