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first allow me to wish you all the best for the new year, congratulations and thanks for all the effort to develop and improve this nice software.

1. – I try to update from sourceforge – but isn’t work …Windows XP
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Python 2.7.5 (default, May 15 2013, 22:43:36) [MSC v.1500 32 bit (Intel)] on win32
Type "copyright", "credits" or "license()" for more information.
>>> ================================ RESTART ==========================
>>>
RTLSDR Scanner

Traceback (most recent call last):
File "C:\Program Files\RTLSDR Scanner\rtlsdr_scan.py", line 89, in
frame = FrameMain("RTLSDR Scanner", pool)
File "C:\Program Files\RTLSDR Scanner\main_window.py", line 145, in __init__
self.create_widgets()
File "C:\Program Files\RTLSDR Scanner\main_window.py", line 164, in create_widgets
self.graph = PanelGraph(panel, self)
File "C:\Program Files\RTLSDR Scanner\windows.py", line 185, in __init__
self.toolbar.Realize()
File "C:\Python27\lib\site-packages\wx-2.8-msw-unicode\wx\_controls.py", line 3875, in Realize
return _controls_.ToolBarBase_Realize(*args, **kwargs)
PyAssertionError: C++ assertion "wxAssertFailure" failed at ..\..\src\msw\tbar95.cpp(726) in wxToolBar::Realize(): invalid tool button bitmap
>>>
I don’t know …is a problem with the installer , or on my laptop
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I have not knowledge in programming and OS …but for me…
I solve this by download und unzip your RTLSDR-Scanner from GitHub in a folder – (there was instaled all dependencies before) – run rtlsdr_scan.py – and no problem … it works fine .
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maybe can you to solve it in case there are other with same problem.

2. - allow myself a few observations – suggestions :
2.1.- at high frequencies, three decimal aren’t sufficient for the identification of some emitters
and zoom mod isn’t useful without a more acurate frequency on cursor displaying.

…I take a look at your module , try this empirically :
Windows.py
…..
205 text = "f = {0:.6f}MHz, p = {1:.2f}dB".format(x, y)
207 text = "f = {0:.6f}MHz".format(xpos)
........
And it work – cursor display is in Hz - for me is fine.

2.2 – at this moment, to be more useful, your soft need :
a max/(min)HOLD options correlate with -
a MARKER PEAK – function – (next peak left – next peak right)

3. – sorry for my English - I hope I was understandable

All the best,
Paul