Portsdown Output Levels

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The typical performance for a well-adjusted Portsdown Filter-modulator board, being driven by a black ADF4351 module through a VCO Filter is as follows:

Frequency MHz SR Output Level dBm MER dB from MiniTioune V0.5a
71 333 9.6 25
146.5 333 10.1 26
437 333 9.2 26
437 1000 9.0 26
1255 333 5.0 26
1255 1000 5.0 26
2400 333 −7.0 25
2400 1000 −7.0 25

These figures were measured by G8GKQ using a Version 1 board (as sold by the BATC Shop in Jan/Feb 2017) modified to Version 1a standard. The measured performance of the the factory-assembled V1a boards was very similar. Figures are included for 2.4 GHz out of interest - this is well outside the specification for the board.

Spectrum plots of version 1a

Mod after.JPG

1255MHz, 333ks, 5MHz/division


333ks.JPG

1255MHz, 333ks, 500KHz/division


1ms.jpg

1255MHz, 1Ms, 5MHz/division


2ms.jpg

1255MHz, 2Ms, 5MHz/division


4ms.jpg

1255MHz, 4Ms, 5MHz/division