Quarter Wave Notch Filter for 41 Meters

To help solve the 41 meter (7300-7500 kHz) shortwave transmitter overload a quarter wave stub has been inserted to help attenuate just that part of the band. More info here.

The filter is wide so there is affects frequencies +/- 10% of the design frequency. The further away from the design frequency, the less the attenuation.

The filter has improved the overload issue and is only a minor inconvenience on the 40 meter ham band.

Receiver Timeouts Increased

For your wintertime listening pleasure, the session timeouts and maximum daily times have been increased. On receivers 1, 2, and 3 there is a 3 hour per session timeout and a 10 hour per day maximum per person. On receiver 4 there is a 6 hours per session timeout and a 18 hour per day maximum per person. Timeouts are instituted to make sure that inactive sessions don't tie up a receiver and prevent others from using it. If your session times out you can reconnect up to the daily maximum. https://n1nte.blogspot.com/p/online-kiwisdr-receivers.html

Intermittent Antenna Issue Fixed

Over the last week or two I noticed that signals on the KiwiSDRs occasionally dropped 10-20 dB or more and then would go back up to normal full strength. I dropped the antenna today and noticed that one of the wing nuts on the balun that connected one of leg of the dipole to it was loose. (We've had several days of strong winds over the last couple of weeks.) Been listening to it for about an hour now and the issue seems to be resolved. Enjoy listening!

Improved Interface for Smartphone Use

Some experimental code has been added to all four KiwiSDR receivers that should allow for a better experience while using a smartphone. I welcome any feedback on this that you might have.

N1NTE - Holland, MA

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