[hpsdr] Strange question about Penelope

[Phil Harman]

Hi Alberto,

Sorry about the delay in replying - I've been to Dayton and am 
presently on my way home, first chance to check my email at the airport.

What you suggest is possible but will need the interpolating CIC in 
Penelope changing. At the moment this is a single stage CIC with a 1dB 
passband at 5kHz - fine for AM/SSB but too narrow for your application.

Please see the Wiki for the current Verilog block diagram of Penelope 
and you will see what needs to be changed. Also, at the moment the I&Q 
data is sent from the PC at 16 bits and 48kHz - you can increase this 
up to the limit of the USB2 but I would suggest not operating in full 
duplex since switching the FX2 between Tx and Rx causes quite a 
performance hit. Adding a second Ozy board (with different PID) would 
allow full duplex.

Hope that helps ( in my jet lagged state!).

73's Phil...VK6APH




Quoting Alberto I2PHD <i2phd at weaksignals.com>:

> ***** High Performance Software Defined Radio Discussion List *****
>
> Suppose I have an I/Q WAV file recording of a segment of 1 MHz of 
> band, recorded either with Perseus or QuickSilver or Mercury (when 
> ready). Would it be possible to send back via the USB port those I/Q 
> data to Penelope, and have it regenerate that segment at the 
> frequency of interest ? Of course the 500 mW of Penelope would be 
> spread over a large chunk of frequencies, and the power density will 
> then be much low, but maybe useful not to be retransmitted, but for 
> performing measurements.
>
> Any thoughts ?
>
> 73  Alberto  I2PHD
>
>
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