jks

From the v1.274 CHANGE_LOG file:

v1.274  March 17, 2019
    Added URL parameter "keys=" to apply specified keyboard shortcut keys upon connection.
        Example: "keys=xyyys" would cause the control panel to be hidden ('x' key),
        top and label bars to be hidden ('yyy' keys) and spectrum display to appear ('s' key).
        The shift key can obviously be used (e.g. capital 'S' for waterfall auto-scale) but the
        control and option keys cannot. But this should not be a significant limitation as it only
        effects parameters which can be set in other ways (see below).

        The keys used to enter values and options into the frequency box cannot be entered using
        this new parameter. Use the existing "f=" URL parameter instead. Remember that you can
        directly set the zoom value using the f= parameter since the other components are optional
        e.g. f=usbz7 f=/750cwz12 f=z4
        
    Added URL parameter "wfm=min{,max}" to directly set waterfall colormap control values.
        Example: wfm=-90 (WF max value is unchanged) wfm=-120,-60 (changes both values)

From the v1.274 CHANGE_LOG file:

v1.274  March 17, 2019
    Added URL parameter "keys=" to apply specified keyboard shortcut keys upon connection.
        Example: "keys=xyyys" would cause the control panel to be hidden ('x' key),
        top and label bars to be hidden ('yyy' keys) and spectrum display to appear ('s' key).
        The shift key can obviously be used (e.g. capital 'S' for waterfall auto-scale) but the
        control and option keys cannot. But this should not be a significant limitation as it only
        effects parameters which can be set in other ways (see below).

        The keys used to enter values and options into the frequency box cannot be entered using
        this new parameter. Use the existing "f=" URL parameter instead. Remember that you can
        directly set the zoom value using the f= parameter since the other components are optional
        e.g. f=usbz7 f=/750cwz12 f=z4
        
    Added URL parameter "wfm=min{,max}" to directly set waterfall colormap control values.
        Example: wfm=-90 (WF max value is unchanged) wfm=-120,-60 (changes both values)

Fixed in v1.272
From the CHANGE_LOG file:

v1.272  March 14, 2019
    Added URL parameters "p", "prot" and "protected" (they are all equivalent) to force a
        password protected channel to be used when connecting. This is for the case of a Kiwi with
        a mix of password protected channels and publicly available channels without a password. 
        And you want to connect without decreasing the pool of public channels.
        
        Note that if you are connecting from the same local network as the Kiwi, and admin auto-login
        has been setup, this is counted as a connection from the password protected pool and you
        do not need to specify this parameter. So you would not need to specify the "prot"
        parameter for a Kiwi on your local network but you would need it for a Kiwi installed at
        a remote location. Or it would be needed by a group of users to access the private channel(s)
        without impacting the availability of the public pool.

More information about URL parameters: http://kiwisdr.com/quickstart/index.html#id-user-tune
kiwiclient.py needs to be modified to take advantage of this change.

There seems to be a couple of issues here. Take a look at the 0 - 250 kHz band segment below. There is a terrible -60 dBm (S9+10) switcher starting at about 37 or 38 kHz. And it is very wide at the fundamental which will make the harmonics even wider. There is also this funny frequency-switching (square wave looking) signal at 67 kHz.



Now look at this 17 - 19 MHz segment. Harmonics of the square wave looking thing are clearly there as well as what sound like harmonics of the 38 kHz switcher (particularly above 18 MHz). Now you might ask why are there no harmonics of these things in the 1 - 15 MHz range (or why they are so much more heavily attenuated). But I have seen this behavior before where there seems to be selective attenuation of the harmonics. It is extremely interesting that two sources of LF RFI seem to have the same attenuation pattern.



Does it happen at all hours of the day? I'm wondering if a street light (electronic or otherwise) has gone bad. Does the signal strength change (or even null) if you rotate the loop?

I can reproduce this error by putting invalid input in some of the configuration fields, e.g. making the "photo maximum height" field blank rather than a number on the admin webpage tab (it's set to 350 by default). So look at all the field values carefully.

You can also cause the default kiwi.config file to be reinstalled by doing:

cdp
mst        // stops server
cdk
mv kiwi.config kiwi.config.save
cdp
mi         // make install       
ku         // restart