just been playing with the 25mhz tcxo for q"C"x+ in a U3s. QRSS is good to 2 meters! a little drift to start due to other components, BS170's ect, then it settles down nicely! Much better than the fox

In addition to Allison's comments, the filters are designed to work with 50 ohms input impedance and 50 ohms output impedance. If either of those impedances are not 50 ohms the filter cutoff

All working well on WSPR for weeks This morning the display is acting weird and the buttons are sometimes not responsive This afternoon the display stats flashing on and off with smell of burins from

Also PCB conductor size and spacing are a factor as well. For example 100W is 1.4A into 50 ohms so heavier and larger relays become a factor. 20W is easy 50W takes care, more is significant

Phil, THe AL used for winding of toroids has a variation of 10-15% so depending on how tightly wound plus individual batches you get variation. The Iron powder material is really like many high

Len, Attached above is my input regarding an “antenna tuner” question asked last week. 73, Bob – KG5SQJ

I've completed a 20M QCX+ and have just fixed a friend's 30M QCX+. Both are working nicely, but at 13.1 volts I get about 3watts output on both, using the onboard RF tool to measure (and less on my

Hi, what is the gauge of the magnet wire supplied with the QCX+ kit for the toroids and transformer? Also, is there a particular antenna tuner or tuners that have been found to be most useful with

The left button (S2) completes a series circuit between R44 (3.3K) and R46(10K), with R44 going to +5V and R46 going to ground. If the right button (S3) works properly then R46 is probably not the

That fixed 90% of the problems I ever had with my original Nintendo!

Just hit them all with a soldering iron. You'll know it when you find it. Mike WM4B

Great. Last week at our LARC Kit Building session I examined a members soldering, by looking closely at the component side of the board. When a joint has had the right amount of heat, flux and solder

Thanks Dave, a few taps on the back of the display and all was bright again. Finding the dodgy joint may take longer! David G4DMG

Blimey Justin! Really pleased that it sorted your problem. My QCX has been powered up virtually every minute since and works like a charm. I've gone up a license class since and just waiting to sit

Give it a bit of a tap. That might change things. Number one problem with kits is always poor soldering, cold joints, or even an overlooked joint with no solder at all. Dave

Finished my 20m QCX+. Powered on and adjusted R47 to get a nice display, went through the alignment process, all OK, put top half of case on, all still OK Powered off, went for lunch, came back,

I seem to remember I suggested that 4 hours ago:-) 73 Alan G4ZFQ

Ted (and others helped resolve this problem), I have just built a QCX+ a few weeks ago and after it working for 2 weeks, i experienced the same exact problem you described. After a few days of

oops, make that LM317 or better yet, LM350....

Hello again! I'm taking baby steps towards building a matching speaker/power supply for my QCX+ I've got an enclosure on order through eBay listed as: "150x105x55mm Aluminum Enclosure PCB Shell