So I've built a U3S with one 20m LPF.  Using on WSPR.  Was never heard after a month of operation, yet verified it is transmitting from another radio in the shack. 
Decided to build and install the filter kit with 4 filters installed.  15, 17, 20, 40.  15m installed in position #1 (Highest frequency). Done
Built and installed the 5w amp kit (simple version)

A few questions...excuse my ignorance, but I've apparently not set something correct.

1.  I only have position 1,2.3 instead of 0-5 available.  How to get to recognize the other relay spots?
2.  When you have more than one frequency active, does it cycle through them systematically, or do I have to only have one frequency active at at time?
3.  I am not clear on the Start/Frame concept.  I realize the time past the hour and the duration, but why the variables?  What is the advantage, and how to set up?  I just chose as a random start of 16 and frame of 10 (mainly because manual said to use 10, but I can't see the reason to change it and what you gain by doing so)

Thanks in advance.  If anyone has any other references than the manual (which is written well, but assumes alot of knowledge I do not have).

Paul

Hi Paul,

I would go back to basics and focus on getting the bare U3S with 20m filter working. You should see some, if not many, spots from receiving stations with the basic 200mW output and a simple antenna like a wire dipole.

Are you using the external GPS unit to synchronise the time, or setting the time manually? Accurate time is a critical part of WSPR. As is frequency stability, so you need to make sure the signal is not drifting during the 2min TX cycle. There is a document here which explains some of the options to reduce drift… https://www.qrp-labs.com/images/appnotes/AN001_A4.pdf

If you don’t have accurate time (to within a second I think) or stable frequency output then you won’t be decoded and reported by remote receivers. Sorry for not addressing any of your specific questions, but I think it would be good to get the basic kit working on one band before brining in more variables of the filter switch kit and the amp.

regards,
Jim

One other potential gotcha with WSPR is the frequency you transmit on… you must program the U3S for the actual frequency and not get caught out by the “dial frequency” (like I did!).

So for 20m the dial frequency on a transceiver is 14.0956 but you must program the U3S to transmit in the range of 14.097000 - 14.097200 else you won’t be heard.

regards,
Jim

sorry for formatting…no idea how to remove the large text size :(

Start is the EVEN minute that you want to start TX, Frame is how often in EVEN minutes between TX....... you do not wat to TX every two minutes.......  for long runs 10 minute Frame is good for immediate testing it is OK for 2-4 minute intervals but don’t be a frequency hog.

To get more bands visible increase the txs parameter in the menu to say 6, ser start to 00 10, this will give you a wspr tx every 10 minutes 6 times an hour. 
Andy 
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