Ultimate3 QRSS kit - page 7
Ultimate3 QRSS kit - continue building and testing
To get more information about the state of the system I added 2 leds to give me information about the voltages regulators (when the up and running or not) and 2 leds to indicate low or high output power (if the +5V is used to drive the BS170's or the +9V).
In the back there is now a on/off switch above the DC chassis part and a aditional switch which allowes me to apply +5V or the +9V to the BS170's.
Interiour photo and close-up on the power regulators. There is still room for a small power filter to prevent HF leaking out over the DC line.
Other interieur photo.
This evening I couldn't resist to switch on the Ultimate3 again and after a while i got quite surprised. At 20:14 VK7BO spotted me with a SNR of -30 in grid QE38mo. Which means the signal has found a path over 16818 km.
The next thing to fix was to find out why I still have drift on the 10 and 20m band. One thing I know was that the GPS I was using wasn't the best one there is thing was allread 10 years old and not really state of the art. Also I know that my configurations had some troubles with the high frequencies.
Gerrit Vinke (PA3DWC) pointed me out that there was a know issue :
A zero park frequency is the same behaviour as in v2.04. However please note
that it appears that on some DDS modules, this causes a frequency drift during the next key-down. This will be worse on higher transmission frequencies than lower. It can be bad enough to prevent WSPR decodes.
Well that sounded just like the problem I have. I did switch the DDS of the parameters set to 3. Which could like 2 have some issues on the higher frequencies. Changing the Park setting to 0 seems to make the drift beter. But maybe option 1 also may work.
Continue reading on next page : page 8 - new gps