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That's great to hear Howard. Enjoy. 73, Cliff, AE5ZA

John, Just be aware that in at least one case, I think a QCX, the Si5351 and processor were damaged by 12 volts flowing back through the driver IC from a BS170 with, presumably a drain/gate short. As

Ted, You might get pressed into service. Do you also have a scale that measures in milligrams? I don't know whether it's a true need, but it might be interesting to know how much material was

I think you need to learn how to not get angry about words written by strangers on the internet. I'm open to having a technical discussion, and I apologize for not noticing the details of your

If you really need research on this, I have access to a vertical mill and a serviceable micrometer...

Razvan’s reflections remind me. ?How many of us were guilty of the pleasures in running an 807 (or two) much harder than “recommended”? ?And yet in the QxX series of designs the specifications

There is at least one example of the 6N7 tube pressed into HF service, it's available in both glass and metal envelops. Justin N2TOH

Stephan, I wish you'd make up your mind. You manslplain stuff ne, then contradict those same principles. To wit: "Well, firstly, I'm not saying that?no?heat is being transferred. But it's

50C is ‘too hot to leave your finger on comfortably’, so it’s probably not 60C. Looking forward to what your DVM’s thermal probe says. 73, Willie N1JBJ

Chris, My 12.0 V PA simulation is producing about 3.7 W into a 50 ohm Rload at 14 MHz. When Rload drops to 17 ohms (3:1 SWR) the BS170s show as at their Pd limit, about 800 mW each. They are not yet

To my understanding (and anyone more knowledgeable feel free to correct me), RF lowpass filters don't work by converting energy contained in the harmonics into heat, but rather by presenting a high

Just to confirm that the rig works like a charm. Have had a few QSOs already on 80m-40m-30m. Re-stating the obvious here: it's a fantastic little rig. It gives 4W solid on all bands with 12V (slightly

I originally got the idea from an SWL (later GM8BAR) with whom I went on DXxpedition as GC3PAI/A and ON5YB in the 1960s. He had built a receiver which could best be described as the transistor

Hi Kirk and Evan, I’ve ordered some replacement IC5’s and am waiting for them to arrive down under. ?This weekend, I’ll put the oscilloscope onto the gates of the BS120s while the old IC5 is

Howard, As you have found the QMX is like the QDX, with Windows it does not behave as other USB devices. It will only enumerate once, then it has to have a power cycle. Hans is aware of this but he

The BS170 are producing a signal that approximates to a square wave - the fundamental with a lot of energy in harmonics, 30% or so. These harmonics are all removed in the transformer and the LPF to

Are you suggesting that a bunch of nerds would waste their time and energy theorycrafting about irrelevant technical details? I have never heard of such a thing!

The new winding style for T501 in the current version of the assembly manual promises tighter coupling between the primary and secondary windings, which might put less power through the ferrite and

Hello Cliff hopefully I’m replying to the right one here you had the only correct answer that worked ?for me I thank you thank you thank you from the bottom of my heart I jumped ?through flaming

I HAVE one of Joe's rolling ball clocks !! The woodworking is meticulous, so everything just 'clicks' -- like a clock w2jc