Zachtek WSPR gear

For the last few days I have been using the 200mW Zachtek WSPR TX. In the end I bought the original kit although it is being copied in China. 

As far as I can tell, the Chinese copy does not have the low pass filters fitted so will have poor harmonic rejection. The Swedish version is far more expensive.

So far, with 200mW WSPR, it has reached 5 continents,

All timing is by GPS, which is built-in. Once programmed the unit needs no PC, so can run unattended. Mine comes covering 40m-6m. I also bought the all band RX, but I have not used this yet.

See https://www.zachtek.com/wspr-tx .

ZachTek WSPR transmitter

These are handmade in Sweden, although there is a Chinese rip-off that is available for much less. I think if files are available on the internet there is always a danger of this happening. 

I am not sure what protection registering the design gives, but I guess it must offer some help.

As I understand things, the Chinese rip-off does NOT contain switchable low pass filters, so the harmonic output is unlikely to be very good.

See https://www.zachtek.com/product-page/wspr-desktop-transmitter