Tuesday, December 18, 2018

iOS WSPR Watch app with multi-band spot graph

There's a new version of the iOS WSPR Watch app coming out today. Encouraged by some enthusiastic WSPR watchers, I've done some work to add and rapidly improve the graphing of spots.


The graph now shows spot counts aggregated over various blocks of time rather than per two minute slot. The band colours match those used on the WSPRnet.org site.

My thanks to Mark, Phil and Ross for feedback and ideas. Phil, VK7JJ, has an exceptionally low noise level in Tasmania and he also runs an excellent web tool for plotting WSPR spot reception.

I've been picking up Peter, VK3YE, quite reliably and I asked him how he was doing the multi-band transmissions. He's been using a  Zachtek WSPR transmitter which he reviews here:



Most entertainingly, Peter took the transmitter bus mobile and I was one of the stations that received him during a trip!


I like how peter holds the compact loop at the ground point of the feed line and how he notes the SWR change as the metal window frame changes the loop characteristics.

What SNR level shown on WSPR is needed for an actual conversation?

The fact that I can reliably hear some stations got me wondering about what Signal to Noise ratio shown in a WSPR reception would mean the two stations could have a keyboard to keyboard chat. There's a bit of controversy about the equivalence between WSPR and other modes such as this thread, but the consensus seems to be that Olivia 500/8 is the best bet.

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