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Hi Dennis... and thanks for the reply. I actually discovered this sad fact last night. The weather in my neck of the woods has been too nice the past few days to do any experimenting, but I hooked up

Aaron, I think you definitely over drove the PA! Typically, an RF probe is a half-wave rectifier.? If you are trying to measure the peak-to-peak voltage, the best way is with an o'scope.? With the

Nope...I never got around to that. I'm hoping someone in this group might run with it, as I have other projects I want to get to. Jack, W8TEE To: SoftwareControlledHamRadio@... Sent:

This question is most likely for Jack W8TEE. I have my DDS VFO and 49er assembled and all appears to be working correctly. I have a question about the tx offset function. I do not observe any

Evening all. Some troubling news... but I want to bring it up to the group in the hopes that the same problem can be avoided for others building the radio. I've had my DDS controlled 49-er on the air

Thanks Norbert, My question is: Is the green one the same characteristics as the black core. I searched for a green ferrite color code and it doesn’t track to the specified type. 73 Gary

Hi Gary! I had the same experience with mine. The red is red and the green is the one they refer as black. L3 = Green core 11 turns L4 = Red core 16 turns Check the "49er Inductor windings" post from

My 49er kit came with a red and a green ferrite core. Has anyone else had the same experience for L3 (green not black), and does the green core seem to work for L3? 73 Gary W5GW

Hi! Quick update, I hot glued a battery holder to my case and I'm getting around 12.6 volts (fully charged) with three 18650 LiOn batteries. I believe these are rated 3000mah (Samsung ICR18650-30B).

OK, thanks Jack.? As I said, my testing methods were primitive and just a first glance.? I'll dig into the details next week when I get back to the workbench.? I may have something messed up on the

Dave: Dennis has posted the spectrum traces for the VFO and they all look within specs to me. Jack, W8TEE

Yes... And Dave, If you haven't done so yet, you may have to run the formula that Jack describes in the QST article in order to get the VFO calibrated perfectly. We breadboarded this project every

Don't forget that the crystal on the DDS board may not be exact and you should expect some deviation. The article details how to correct for the "slop" you may find. 73,Jack, W8TEE To:

Thanks for the response Aaron.? I haven't had time to investigate what is happening yet and won't get a chance to do that until next week sometime as I'm getting ready for a short trip.? My DDS is

Hi Dave. I have to admit that I haven't but I certainly will now. When I fired up the DDS controlled 49-er for the first time, I checked it against my frequency counter to see what it was doing. I was

Has anyone looked at the harmonics on their 49er. I must admit that my testing method is primitive but looking at the 2nd and third harmonics on my K3/P3 panadapter, the 2nd and 3rd harmonics on mine

Good to hear! That was one of the design goals that the three of us shot for when we started the project. As I mentioned in the article, we wanted a VFO that would be capable of powering older rigs,

Thanks for the reply, Jack. I successfully made the adjustment to 4 vDC using an RF probe and my VTVM. And Farrukh is absolutely correct... you need to give R1 quite a few turns in order to see any

Got this today: Hi Jack, There are two pots on the DDS VFO board. R1 adjusts the GAIN of the RF buffer amplifier and hence the AMPLITUDE of the sine wave output on J3. R8 is for calibration of

Thanks for the relay, Jack. And therein lies the rub. Rotating R1 has no effect whatsoever on the output... but I'm not thoroughly convinced that I tested the output voltage at the right spot on the