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Hi Daniel, This is a good place to start! https://hackaday.io/project/190327-high-schoolers-build-a-radio-receiver As Chuck mentioned you can get a nice PTO from

The only ones I've found are potted and at ghastly prices. I haven't seen the unpotted ones like in articles in articles in over 45years. Allison

Does anyone know of a source for 88 millihenry (88 mH) inductors? These were originally used by the phone company on telephone lines, and then later repurposed for use in the passive audio filters

Steve R. sent me some mica caps rated at +-1% for use as pseudo-standard for capacitance checks.? Thanks Steve. I'm sending him some transistors for his effort. Here is a comparison between his

With nothing more than some nylon bolts and nuts, some hot glue, and the required brass bolt, and maybe some PCB material for structure, you could make the knob stationary, and make the coil the thing

There's a complete YouTube series on building this, each module has its own video, done by Dean KK4DAS. There are two folks who are 3D printing the inductor assembly and making them available just for

If budget is not an issue: <https://qrpbuilder.com/pto_mechanism> FYI -- chuck adams, aa7fo QRP WAS 17m started Apr 2, 2025 WAS-17 QRP --> TX,FL,SC,GA,OK,AR,KS,AL,AZ,MN

Not ashamed to have built many projects with hot glue and velcro strips. KB9BVN

I can think of lots of ways to build that without a 3d printer. They all involve hot glue ;) <daniel-kk4mrn.skipper529@...> wrote:

Hi Alan, I have looked at it, but I do not know where to begin. Besides, it needs a PTO.? I do not have a 3D printer to make the part. I think one ham used a fix frequency oscillator in place of

Gang, I accepted the Soldersmoke DC Receiver Challenge on April 19th. Here is my 3 stage audio amplifier I finished this morning. Please join in on the fun! 73, Alan, N8WQ

Pacificon 25 is going to be remembered as the return of qrp year.? You can register and get your hotel room at Pacificon25.org for the 3 day conference that will be held the second weekend of

Hello All, The 2025 Sasquatch Stomp results have been posted to the Sasquatch Stomp page on the pnwqrp.org website.? If you google pnwqrp.org it will come up right away. We had good band conditions

These are all good values to have in stock Daniel. If you need some of the values in between, they can be created by putting multiple caps in parallel or series. For instance, I recently needed a

Hello, When I created the original topic here, it was a longer message.?? So, this is where the "Octopus" came from.? But I shortened the message because I felt it was too long.? But I forgot to

Hey Dave, I am taking your advice.?? I found the TDK MLCC NG0 / CG0 capacitors at Mouser. I have been trying to go through various projects look at band pass and low pass filters and IF Amp filters

Very useful info Jim - thank you. I made an offer of $18 for a bag of 100 x 1,000pF caps (the first eBay listing you mentioned) and he accept

Hint: For a lab standard it does not have to be any specific value only that it be known and stable.? For some parts like resistors and caps a selection of known values is usually handier. With

Dear WilliamThanks for the comment. To be honest i did not realize or check there were ohr sub directory before upload. ?t was late night and? I tried to help and share with ham spirit. I will check

Hakan, Very respectfully, there are already copies of the four OHR manuals you uploaded. They are in the "OHR" sub-directory. You might want to inspect and -- if duplicates -- remove yours as space