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EMRFD is an excellent publication but the edition I use ( First Edition, 2nd printing ) has so many errors I have to check the corrections book before I trust anything just to see if an amendment has

Joe I may not be of much help here. I was assuming that your design was a traditional H&P layout. You did express yourself well, I just did not read it well. The G4DXZ design is PIC based with most of

Chris Ah yes, it takes a little thought, USB RX of WSPR is 1400-1600Hz above Dial frequency. The U3 frequency is true TX frequency. So the PPS is working correctly. 73 Alan G4ZFQ

Hi Arv I think I didn't express it well. All the functionality is internal to the microprocessor except for an RC integrator on the output pin. So a timer is setup to generate a hardware interrupt at

Oh dear, I think I have it.? I was tuning?to the WSJT frequency of 14.095.600 for example. I should have been turning to the frequency suggested in the manual. 14.097.100 for example. I feel a bit

Hi Alan, Oh sorry, should have clarified that. I'm trying to work 40 and 20 meters though the U3S. I'm using the 10m dipole to attenuate the signal further. Yes, I'm picking up spots from other people

I was hoping the person that sent me that would get more answers to look at here rather than to my private email.? There is the chance someone else had the same problem. I've build four of these and

Chris, This is on 10m? Are you actually seeing other signals there to confirm your RX is correct? 73 Alan G4ZFQ

For digital methods I just got to the available libraries of code that already do it. In the linux world that is often the norm for people that roll their own. For RPi and the various STM32F series

John VA7JBE, For all pass circuits look at EMRFD there is a couple of chapters and you can use the designs described. EMRFD Experimental Methods for RF Design.? Do not let the claim of old or

Joe Output of the leading/lagging slicer should be either high or low...no in-between state. I would start troubleshooting that area. If using a D-type FF for the comparison function...its outputs can

Hello Hans, Thank you for your reply. I'm tuning in using WSJT-X on another rig, +attenuator +another 10m dipole. When the offset is set to 27,004,000, I can see and hear the signal in the waterfall

Thanks Arv Yeah it is a very curious thing. I am injecting a TTL level signal from a DDS for testing so the input level is not a factor. What gives me doubts about continuing with this design is what

Joe I have to admit that when Hans first brought H&P to my attention several years ago it took me several months before I was forced to admit that it was not a mixer. Key concept is edge alignment

Hi Chris You may not be doing anything wrong. It's normal for the 27MHz crystal to oscillate 4 or 5 kHz too high. Why do you think the output frequency is 1.4kHz high? How are you measuring it? 73

Hi Frenk, will try something next week - now working on LNB indepandent LO input. Will report... 73 lexa, OK1DST

Hello Alan, Thanks for your reply.?I have the GPS pulse set to +1 edge. I have the U3S set to GPS Mode 2: From?the manual:" 2 The kit triggers on the rising (positive) edge of the 1pps signal. This

Well last night I had a bit of a play around with the software type shift register and XOR implementation using a Sparkfun UBW board which has a PIC18 processor and a 24MHz crystal. G3DXZ originally

I have seen RF on the paddle cable mess up other rigs even elecrafts. Using a shielded cable between the paddles and rig has worked. Ed AB8DF

I got the internal keyer issue resolved. Oddly enough, it seems the problem was RF feedback related to running into a dummy load that was setting too close to the rig.? Later, when I put the rig on