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Jerry, I can't see how the varactor FM method might work, as you need precise frequency control. With I2C writes, you control the PLL and thus you have precise control. With varactor, you don't.? The

Hi Rob Interesting, it was essentially a fault at same place in the signal path as?L1 connects directly the the antenna socket. Might be a useful reference for future troubleshooters trawling the

Fully meshed C1 would seem to indicate too low inductance on S3. Removing turns is the wrong way to go.? Are you sure C5 is correct value? I.e. not too small? -- VY 73, Wes AE6ZM Sierra Vista, AZ

Jerry makes a good point. S3 is the reasonant circuit with C1. If the C1 plates are around half mesh when peaked the turn count and inductance are correct. Primary, S1& S2 windings work simply in

Excellent idea!

That's it! I knew I had to be doing something wrong, just a case of knowing what it is. Tnx Bob, Andy, for helping me out. Brian VE7JKZ

Allison, Yup, the si5351 is poorly documented. It takes a little bit of reading between the lines and experimentation to figure out what it really does. On the other hand, it is a $1 part meant mostly

With many thousands of QCX transceivers on the air, should we consider a QCX QSO party?? We can have band specific awards, power maximum awards (not all QCX transceivers have the same output), and

I've completed a 40M QCX (built the 20M last year). Doing the BPF alignment, I could only get max signal with C1 nearly fully meshed (at a power of 10), so I removed 5 turns from T1 (which was easier

I'm very curious how well the i2c writes into the si5351 do. Looking forward to your notes on how clean you can get the signal.<< Jerry, All you need to test the signal generation is a raduino.?

I agree with Bob.? Andy -- The universe is made up of Protons, Neutrons, Electrons but contains only one M0RON.

5. If I keep pressing the Menu key I go through the rest of the menus until 'Press right button'. So I press the right button and it returns to Step 1 above........ Stop pressing buttons at that point

Al, If your inductance meter is accurate wind it for inductance. That should give first-time results but still be prepared to adjust turns, correct operation is what you aim for. 73 Alan G4ZFQ

Actually I take that back. L1-L4 I wound based on their inductance value. I wound T1 based on the number of turns.? Curt M.

I wound mine based on the specified inductance value and didn’t have any problems. I’m sure more people wound thiers based on the number of turns and everything probably worked out fine for them

Hi Andy, Yes I did try that, to no avail. Now I'm going to give a step by step of events switching on from a cold start. This may be somewhat lengthy but hopefully there will be a clue somewhere. 1.

I'd think C1 has enough range to tune the winding it is in parallel with. Otherwise, if anything is critical, it might be the ratios between the various turn counts. So just build it to the specified

My reason for asking about the actual inductance for TI is to find out if the number of winds is the priority or is the actual inductance. Is it better add or subtract a winding in order to get a more

Does anyone have the inductances for the T1 transformer? The calculated inductances I have for 40meters , PRI, S1, S2 is 0.10-0.14uH. Is this correct?. The calculated inductance for S3 is 6.9-7.1uH.

Hi Floyd, Went to work on the QCX 40 this morning? and found no problems with T1 but discovered that L1 was the culprit and once I had re-soldered the joints all was well so many thanks for leading