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For some time I have been interested in the all-in-one type WSPR  transmitter. A fellow blogger Paul PA0K posts his WSPR adventures using the SOTAbeams WSPRlite model. This unit is no longer available and when I did a web search I found very few units on the market. The unit I  purchased was the Zachtek WSPR Desktop transmitter. The desktop transmitter has great reviews on Eham. The YouTube videos I watched about this product emphasized its compact size, works right out of the box, is easy to set up and can run independently without a PC. 

The unit I ordered was the 80m to 10m WSPR desktop. The package came from  Sweden and was at my door in under 6 days. Along with the Desktop device, you also get a USB to USB-micro cable and a GPS antenna with a 3m cord with an SMA connector. If you do plan to order one of these units be aware you will need an SMA to SO239 pigtail as it does not come with the unit. They can be ordered at Zachtek's website. Fortunately, I had one as it is used with my NANO VNA unit. 

Needed cable

Some of the selling points for me were:
- It's small size.
- Great reviews.
- Option to run it with or without a PC.
- Easy setup software available on Zachtek site.
- An LED light on the unit that indicates good or bad GPS lock, when transmitting and when idle.
- Automatic band switching.
- The unit is not affected by an extremely high SWR.

It was time to connect up the unit and I went to Zachtek and downloaded the operating software. I connected the unit to my PC via the USB to micro cable for the first time setup of the WSPR desktop, I connected the  GPS antenna and connected my Hustler 4BTV to the antenna port via the  SO-239 to SMA connector.  I entered my call in the box provided and selected the bands I wanted the unit to work on. As a side note, there is also a download for USB to serial driver but I already had that and it was working with no problems with my NANO VNA. I then pressed the start button on the software. I was supposed to see GPS information and the device status. Instead, I saw absolutely nothing.

Nothing happened

 I tried changing the USB port I was using, I then downloaded and installed the USB to serial driver from Zachtek as maybe it was a more up-to-date driver. I tried again and nothing happened. I know my NANO VNA has no issues working on my PC and using the USB to serial port driver, maybe a Win10 update messed things up. I connected the NANO VNA via its USB cable and it came to life. I then plugged the VNA into the same port the WSPR desktop was plugged into and it worked fine. I plugged the NANO VNA into the cable that came from Zachtek and the NANO VNA refused to start! I  plugged the WSPR desktop into the NANO VNA USB cable and the unit came to life. The device status came up and the GPS showed connection status. The issue was the USB-Micro cable from Zachtek it was defective right out of the box. I informed Zachtek of this a few days ago but as of yet, I have not heard back. 

The unit sprang to life

 Once the cable issue was solved the unit worked like a dream. In my next post the result of a 24-hour WSPR run with my Hustler 4BTV as well why the heck did I get this thing and how is it going to help my contesting adventures?

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