开云体育

Cap You will have to look carefully, only when commanded do short pulses occur. A decent camera can be a lot better than a loupe. How about page 140 of the A4 manual?? 73 Alan G4ZFQ

Hi Al What resolution would you like (in horizontal pixels)? 73 Hans G0UPL http://qrp-labs.com

Alan, I did look at the output of the? clock chip with my scope, which is only a 60 mhz Tek and sweeps max about 15 mhz, but you do see rf envelopes up to 50 mhz easily and I see nothing on clk 1,

Thanks to both Alan's for the helpful suggestions.? The factory reset returned the squarewaves to IC3.? For got measure I also added the 10K for the power amp stability mod.? However, I still do

Problem solved! I couldn't figure out why I was getting 12 volts into the 7805 regulator, but not at the PA amplifier stage or LCD module. Then I realized that I must have cut the via when I slightly

Thanks Hans. Roger --- ** Roger Hill **

Hi Cap, No need the for game over thinking.... Man designed it, well HAN's designed it. ;-) Man built it = you. Man / you used it, even if it was only for a short time. It's a positive thing that it

Hi Roger There is a troubleshooting guide here http://www.qrp-labs.com/receiver.html and you can also look at the QCX troubleshooting guide, much of which is also relevant (technique for signal

Kent, I guess that is 88mA? These are close enough, will never be exactly 0. It is a digital chip, pins have 2 states Low might be 0-1V high might be 4-5V the data sheet will give the actual

Thanks Alan. Will give that a go later today. Roger --- ** Roger Hill **

very briefly applied 9 volts to its 5v line, and also Roger, Measure current at 5V, not sure if that is specified but it might give an indication. Set it up and try. Best short the BPF that is very

Hi all: I have built the receiver module, and I'm doing preliminary tests to establish that it is working. I messed up, and very briefly applied 9 volts to its 5v line, and also to my U3S. The U3S

Thanks Hans - detailed reply in private. Dave

Hi Dave I'm using Eagle and as far as I know it doesn't have a 3D option, sorry... I do have dimensions, diagrams etc of all the prominent components e.g. LCD etc. So it could all be worked out. 73

Thanks Alan, I’ll leave it as it is. 73 Keith G6NHU

Hi, i also run a QCX20 on WSPR very successfully without a GPS module with no issues. from the North East of Sotland most afternoons I am heard ?on the Eastern seaboard of USA , furthest distance

Alan.many thanks for hanging in. With scope pin 10 ic 3 , clk1, clk2, all show no signal. Voltage at d1 = 3.5. What are you looking for with pics? Can try to do better at that spot. Very difficult to

Bill You are correct. I had the same false hope. The problem is that the paddle and key share same io into the controller IC because it is short on pins. So it does no good to install a separate

Hi kent, Still receives off air signals OK? Try a factory reset And You done :- http://qrp-labs.com/qcx/qcxmods.html#pwrup (Ideally update to the new values of inductor & circuit change in the latest

Hi All, I am running a QCX40 (#2019), it is currently not putting out power out now, but did have an output of 3.5W, previously. I am not sure what changed.? I have it set at 12.3V and Rx current is