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
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--- In QRPLabs@..., "Paul KE7HR" <ke7hr@...> wrote:
Don, your numbers sound about right, though all of my testing has been at 80 meters. In the files and photo section you can see some screen shots of what I found there. On 80 meters I can get as much as 2.5 watts out with 12 volts to the final, but "throttle back" to 1 watt (20 vpp into 50 ohms) both for the challenge and better battery life for my portable operation.
On question 1: not in the latest version.
On question 2: The number counting up to 162 is the bit being sent. The number varying between 0 and 3 is the number of the tone being sent. WSPR sends 162 bits as four tones separated by about 1.4 Hz.
Have fun with it.
Paul KE7HR
--- In QRPLabs@..., "Don" <don1mh@> wrote:
Paul,
The U2 is getting well! With the software I have (a few days ago), I was able to get my 5 character call in just fine. I think Reset helped a lot. And editing wasn't done right yesterday. Plus I had the LP filter unplugged while testing. I'm using a 3A commercial variable bench supply. I'm finding it's better to disconnect the + to shut down, rather than turn off the main switch. Same turning on the U2. I think turn on transients from supply might give chips some fright!
OK here are some readings and two questions:
RF out of LPF with 47 ohm load resistor
U2 current, not TX-ing = 130 ma
U2 current, TX-ing = 260 ma
P-P RF voltage on scope when transmitting = 12.5 volts
Question 1: Should I see my call on display when TX-ing?
Question 2: What do the numbers mean in middle of the display?
I see a pair of numbers advancing. One space over, I see
0 to 3 in no particular order.
Thanks...Don
