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Hi Al

Thanks for the reply. However, I was also being a bit stupid - I hadn't yet downloaded your full scanner software. I have now done that with git clone git://github.com/EarToEarOak/RTLSDR-Scanner.git
In the src files I found rtlsdr_scan_diag.py which reports no library problems.
Then from the same src directory (RTLSDR-Scanner/src) I ran python rtlsdr_scan.py but get warnings and error messages:

"/usr/lib/pymodules/python2.7/matplotlib/__init__.py:923: UserWarning: This call to matplotlib.use() has no effect
because the the backend has already been chosen;
/usr/lib/pymodules/python2.7/matplotlib/__init__.py:923: UserWarning: This call to matplotlib.use() has no effect
because the the backend has already been chosen;
matplotlib.use() must be called *before* pylab, matplotlib.pyplot,
or matplotlib.backends is imported for the first time.
if warn: warnings.warn(_use_error_msg)
RTLSDR Scanner
Detached kernel driver
Found Elonics E4000 tuner
Traceback (most recent call last):
File "rtlsdr_scan.py", line 84, in
FrameMain("RTLSDR Scanner", pool)
File "/home/pi/RTLSDR-Scanner/src/main_window.py", line 128, in __init__
self.devices = get_devices(self.settings.devices)
File "/home/pi/RTLSDR-Scanner/src/devices.py", line 69, in get_devices
device.gains = sdr.valid_gains_db
AttributeError: 'RtlSdr' object has no attribute 'valid_gains_db'
Reattaching kernel driver failed!
AttributeError: 'RtlSdr' object has no attribute 'valid_gains_db'
Reattaching kernel driver failed!"

Now, I dont know whether I should be doing some sort of install, but I realise this code was probably a multi-platform installer, and not fully relevant to linux. Seems python is finding things correctly, and as I posted previously, the waterfall code in the pyrtlsdr directory works.
I'm sorry if I am not fully understanding what to do - I realise you have been making it all as easy as possible for a variety of users. It would be nice to be able to turn the Raspberry Pi into a cheap spectrum analyser, so I hope it's got enough power.

best regards
Tony