[Hackrf-dev] Input from Photodiode

[Ian Davidson]

Thanks for the replies guys – I’ll have a closer look at the schematics I just downloaded and see if I can do this without getting  to close to the possibly delicate A/D itself .

Ian


From: kd5wdq . [mailto:kd5wdq at gmail.com]
Sent: 14 September 2014 21:22
To: Ian Davidson
Cc: hackrf-dev at greatscottgadgets.com
Subject: Re: [Hackrf-dev] Input from Photodiode

Interesting idea Ivan,

Should be doable, there's a video on getting directly to the
A/D and D/A converters on the board, which is (i think) what
your trying to do.

--ek (af5sa)

On Sun, Sep 14, 2014 at 2:44 PM, Ian Davidson <IDavidson at micropack.co.uk<mailto:IDavidson at micropack.co.uk>> wrote:

An unusual request here, HackRF folks.



I'm looking at the possibility of using HackRF and SDR# (or similar) to detect the beating of two lasers on a fast photodiode.



I know the frequencies of light and RF are several orders of magnitude different but if the lasers (or cavities) are any good (near single mode, stable etc)  then you *do* get a heterodyne beat (Google 'laser heterodyne spectroscopy' if you are keen).



My question is - can anyone on the forum  offer me any thoughts on the best way to interface a Photodiode to the HAckRF input?



Many Thanks



Ian



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