New project on HHH - GDO Revisited (GDO-2)
Page 1 of 1
Re: New project on HHH - GDO Revisited (GDO-2)
Now I have scanned my first calibrated dial and built the next coil.
The new coil (5 + 5 turns) covers 14Mhz to 35MHz.
I also used Photoshop for the dial drawing. I created a layer for the original scan template, then drew a new blank dial on layer 1.
Layer 2 is the 8-22MHz calibration.
I am working on layer 3 for 14 to 35MHz.
I also found that the meter I have used is perhaps a little over-sensitive, so I may have to place a resistor, perhaps 10K, in series with the meter movement. This will also minimise the effects of the adjustment pot on the oscillator frequency.
BR Harry - SM0VPO
The new coil (5 + 5 turns) covers 14Mhz to 35MHz.
I also used Photoshop for the dial drawing. I created a layer for the original scan template, then drew a new blank dial on layer 1.
Layer 2 is the 8-22MHz calibration.
I am working on layer 3 for 14 to 35MHz.
I also found that the meter I have used is perhaps a little over-sensitive, so I may have to place a resistor, perhaps 10K, in series with the meter movement. This will also minimise the effects of the adjustment pot on the oscillator frequency.
BR Harry - SM0VPO
_________________
Everything in this world is either bacon, or it isn't bacon
They say that money cannot bring you happiness, but if you have it then you can always buy more bacon
New project on HHH - GDO Revisited (GDO-2)
Hello all,
The project gives a good description about why I needed to update this project.
This weekend I could not sleep (stinking cold - had it for four weeks) so instead of lying in bed moaning and groaning, I decided to build a new GDO because the old one looks really crappy, and I use it for demonstrations in my courses.
The result is that two sleepless nights rewarded me with this project:
http://213.114.137.49/use/gdo2.htm
It really does look posh
The dial/scale is the same size as the meter display, and the LED and black plastic case make it look a lot more professional. I have only re-built one coil for it, but the coils from my old GDO work ok from 100kHz to 400MHz.
If you don't like to wind a tapped coil, then no problem, do not use the tap. Just put a 470 Ohm resistor between pins 2 and 3 on the coil socket.
Hope you enjoy the project.
Best regards from Harry Lythall
The project gives a good description about why I needed to update this project.
This weekend I could not sleep (stinking cold - had it for four weeks) so instead of lying in bed moaning and groaning, I decided to build a new GDO because the old one looks really crappy, and I use it for demonstrations in my courses.
The result is that two sleepless nights rewarded me with this project:
http://213.114.137.49/use/gdo2.htm
It really does look posh
The dial/scale is the same size as the meter display, and the LED and black plastic case make it look a lot more professional. I have only re-built one coil for it, but the coils from my old GDO work ok from 100kHz to 400MHz.
If you don't like to wind a tapped coil, then no problem, do not use the tap. Just put a 470 Ohm resistor between pins 2 and 3 on the coil socket.
Hope you enjoy the project.
Best regards from Harry Lythall
_________________
Everything in this world is either bacon, or it isn't bacon
They say that money cannot bring you happiness, but if you have it then you can always buy more bacon
Similar topics
» GDO revisited (GDO-2)
» Yet another new project on www.sm0vpo.com
» Going to give the "lil" "Cigar box receiver" in Harry's site a whirl.
» New project on HHH
» New project - something "special"
» Yet another new project on www.sm0vpo.com
» Going to give the "lil" "Cigar box receiver" in Harry's site a whirl.
» New project on HHH
» New project - something "special"
Page 1 of 1
Permissions in this forum:
You can reply to topics in this forum
|
|