The GPS is not needed to make WSPR work. All of my U2 WSPR work has been without a GPS. A few iterations of setting the 20 MHz oscillator frequency are required, but mine has run for more than a week solid with less than 1 second drift after adjustment. Because one of my applications for WSPR will never have GPS, I may eventually build an accurate real time clock based on the ChronoDot module and an Arduino to simulate the GPS, but so far I have not seen the need.
For the final output power supply I used a cheap switching regulator from eBay. Similar to:
I use them because they are more efficient than the linear regulator. Less heat, and heatsinking, and the signal is not interfered with as far as I can tell.
There are versions of the LM2596 regulator with a voltmeter now attached that I see on eBay which might be nice for setup.
Yes, the manual for Hans kit and the WSPR documentation makes good reading. Enjoy.
Paul KE7HR
toggle quoted message
Show quoted text
--- In QRPLabs@..., "Don" <don1mh@...> wrote:
Paul,
From what you said, a variable PS just for the final or finals might be interesting. Use a LM-317 and pot for regulator. Bad news yesterday. Was going th use my old FV-M8 for the GPS. Data out was good on scope, but no 1 pps output. Using it on other projects, I never needed this output. What a letdown! Checked it over and over. Nothing. Sparkfun shows FV-M8 retired, so went with the EM-406A. Guess WSPR will have to wait a few days. OK on questions. I should read the manual!
Don
