Paul "The GPS is not needed"
Good to know about WSPR can work without GPS. What's a good number to start with to nudge the 20 MHz oscillator? Anyway a new GPS should arrive in a couple of days, but I'll try your idea first.
I ordered 2 of the Mini-Red-Step-Down PS's you mentioned. Great find!
I managed to ordered them from a NY outfit, Noo Elec through Amazon, instead of from China. I'm sure NY gets them from China!
73...Don...W6RWN
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--- In QRPLabs@..., "Paul KE7HR" <ke7hr@...> wrote:
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
--- 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
