Beautiful! A Permeability Tuned Oscillator. No need for a fancy variable capacitor — that brass screw moving into and out of the coil varies the inductance and the frequency. Collins style.
Feb 20 at 6:58 PM
I also wanted to send you a shot of what today’s project has been. It’s WA6OTP’s PTO.
I bought the plastic tube/screw/bracket from Jim and I provided the rest.
This is a 40 meter PTO that covers the entire 40 meter band.
A little Q dope secured the windings.
Chris
KD4PBJ
I bought the plastic tube/screw/bracket from Jim and I provided the rest.
This is a 40 meter PTO that covers the entire 40 meter band.
A little Q dope secured the windings.
Chris
KD4PBJ
WA6OTP has a very nice PTO kit:
And a lot more good radio info here:
Our book: “SolderSmoke — Global Adventures in Wireless Electronics” http://soldersmoke.com/book.htm Our coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmoke Our Book Store: http://astore.amazon.com/contracross-20