Peter, If you go back it is amazing how much effort was put into stabilisation, I got the impression that a truly determined attempt really did succeed! One thing that I do not remember being

David, that part of the noise which looks like overshoot on the waveform - the spikes at each transition - look like scope probe calibration is needed. There will be a facility on the scope to rectify

Hi Alan, You have much more knowledge than me on these protocol, With the TX time on wspr is just under 2 minutes as opposed to QRSS of just under 10 minutes so less heating of the XTAL which

It depends when the drift occurs Peter. If the drift is more than about 4Hz during a TX period that is borderline for WSPR. The TX time is when heating may affect frequency. I've no idea how much

Have you done the TCXO mod? Or just using the std 27mhz XTAL as the reference oscillator? This message shows how much the XTAL drifts FW: Upgraded my U3s with TCXO :) (groups.io) even when the GPS

Mine usually says "=" after calibration, with 0 drift reported on wspr so I'd say that it's fully calibrated. Getting spots on wspr depends on more factors than just a zero calibration though. Have

This is the figure on the left immediately after calibration? If so it means the adjustment was 37Hz, possibly showing too much drift. What are your calibration settings? 73 Alan G4ZFQ

Don't have a QCX on 80m (yet), but would be pleased to give you a 1-point QSO of course. Post ur qrg on the sked page and I'll be there ... Fieldday: I'll be operator at ON4OS/P for a few hours on

cheap and simple ... I use a piece of PCB a few mm wide,and abt 10 cm long remove all the copper, and file the tip to the needed shape If it wears out, I just make another one ... and I don't have to

Hi all I *used to* have a nice set of ceramic screwdrivers. However, one by one over the years, they have all either got broken, or lost under the piles of debris and unfinished projects and other

If Q5 has shorted as you put it then there will be next to no voltage on the drain because of the two 10 k dropper resistors on the way to that drain. Many people operate the PA from a separate PSU

Last checked I was getting .037 after calibration. What amount would indicate it’s calibrated and I should be getting spots?

Ok, I may have an issue with my cable. It's not apparently shielded very well. I scoped at the output of the board and got a slightly cleaner signal and a good decode. Still has a number of spikes

Thanks! So, my probe was on 10x. Changed it to 1x and modified the scale. New photo included below. Still, very noisy and no solid decode by the scope. Haven't cracked open the QCXmini to check IC2

I'm with the other Jim: get the ceramic screwdriver set. I bought mine from ebay, because if at all possible, I will not do business with Amazon. (Most of you probably know why, if you don't know

Hi Christi and Zdenek, that sounds like a QCX party on 80 m next time. Next weekend is Field Day time in SSB I will participate with a friend. FT 817 80 m Long Wire and 12AVQ for the higher bands. I

Roelof, Going back and looking at the panels I made, you are correct. I also had the paper laminated before attaching to the front panel. Haven't done that in a while so my brain was not working as

Colin, seeing you are in UK here is a suggestion/supplier 10pc

See pics on my previous post #68528 (click here). My scope is showing 2V per division, and the pick signal is at 5V. (wish my scope had serial data decoder... Very Nice). 73 km6wt

Very Nice Scope. This is 5v logic, so you need to set your probe to 1x. You should see 5V or 2.5V per division. Your pic shows it's displaying 200mv per division. That's what mine looks like if my