When I got my ticket back in the 70s everybody I knew at my local
club knew how to build and use stuff, and was very interested in
doing so. The exam was a written one, and as far as I can recall
there were few multiple choice questions, and various questions
I do recognise these days at my local club that there are a
significant number of hams who are only interested in operating
gear and their eyes glaze over a bit when backs get taken off
radios and soldering irons get fired up. One hopes they will grow
out of their fears and get more out of their respective ham
Nevertheless everyone had to do an exam and surely some of that
knowledge must get taken on board. I can see you have reservations
I am generally in agreement with your last paragraph and it is much easier to build at higher frequencies these days. A good quality BNC connector will work up to about 3.5 GHz. I used to work at a microwave components factory and would measure anything I could get my hands on. Prior to that I cut my teeth on GAT-5 and GAT-6 transistors working at 8 GHz for satellite comms and they were tricky to match and easier to blow up. Had steadier hands then.
So, yeah, we agree on some things.
I noticed your other post about a simple 2m CW rig. Good idea.
Not so simple for many to do a prototype but double sided copper
sheets would be your friend.
I also have a Datong PC1 in my junk box that I bought in a lot as
scrap. I intended just to use the box but I notice that it has a
parametric mixer and a 144MHz filter. I'm sure I could have some
fun with that.
Also have a couple of Avala PCBs which were the forerunners for the Genesis SDRs. They are intended for HF but they are easy to work on and could possibly be integrated with 2m VHF components. That would have to be a downconverter design as the mixer chips are 74HC4066s. Not as good as the QCX design but probably pretty good at 40m. Later on we'll see.
On 10/02/2021 08:41, Jim Allyn - N7JA wrote:
On Mon, Feb 8, 2021 at 09:51 AM, Jim Mcilroy wrote: