new project

Discuss and share ideas for making your own amateur radio gear.

Moderators: W5ALT, AC2C

new project

Postby NT9K » Sun Sep 12, 2010 11:56 am

I've found a new project to work on. I found a circuit in an old CQ magazine for a Michigan Mighty Mite. Mostly junkbox parts.
I found this photo of a real nice version. This one is not mine, just an example!


Image

More information on how to build these can be found here:
http://www.zianet.com/dhassall/mm.pdf

Lots of room to experiment with this simple transmitter.
73, Bill - NT9K
SKCC #1926c69t9was8hofdxq2dxc1
http://www.nt9k.com
NT9K
Member
 
Posts: 330
Joined: Sat Apr 01, 2006 9:25 am
Location: Melbourne, Florida, USA

Postby NT9K » Sat Sep 18, 2010 10:52 am

Here is my version, in progress:
Image
and with the variable capacitor, things get a bit close:
Image
Shouldn't take long to finish it now. Not sure what to call it?
Maybe the sand mite?
73, Bill - NT9K
SKCC #1926c69t9was8hofdxq2dxc1
http://www.nt9k.com
NT9K
Member
 
Posts: 330
Joined: Sat Apr 01, 2006 9:25 am
Location: Melbourne, Florida, USA

Termite?

Postby W2BLC » Sat Sep 18, 2010 1:22 pm

Because it is on a wood base?
W2BLC
Member
 
Posts: 176
Joined: Sat Feb 04, 2006 1:36 pm

Postby NT9K » Sat Sep 18, 2010 2:10 pm

The original design was called the Michigan Mighty Mite, but I don't live in Michigan anymore. For lack of something better, I figured since there is only sand where I live, it might be more appropriate. Maybe not? Someone else suggested calling it the cherry one. It's on a piece of cherry wood and has one transistor. Got a better name?
73, Bill - NT9K
SKCC #1926c69t9was8hofdxq2dxc1
http://www.nt9k.com
NT9K
Member
 
Posts: 330
Joined: Sat Apr 01, 2006 9:25 am
Location: Melbourne, Florida, USA

Postby NT9K » Mon Sep 20, 2010 11:30 am

Almost finished now. What's next? Something with tubes.
Image
Almost time for the smoke test!
73, Bill - NT9K
SKCC #1926c69t9was8hofdxq2dxc1
http://www.nt9k.com
NT9K
Member
 
Posts: 330
Joined: Sat Apr 01, 2006 9:25 am
Location: Melbourne, Florida, USA

Postby KD8JHJ » Mon Sep 20, 2010 5:26 pm

Hi Bill,
Neat project. After thinking about it for a while I think I want my first home brew transmitter to really be homebrew and not in kit form. This might be the one. Thanks for sharing.

Mike KD8JHJ #4877C
KD8JHJ
Member
 
Posts: 25
Joined: Tue Nov 25, 2008 11:38 pm
Location: Galion, Ohio USA

Postby NT9K » Tue Sep 21, 2010 11:04 am

Thanks Mike and thanks for the nice review of my key on your blog. Very nice pictures you took too!

Well so far, I haven't been able to get this transmitter to work. I made some simple mistakes, like I had the transistor in backwards. Then I tried putting a layer of tape between the tank coil and antenna coil, still no luck. There aren't very many things left. maybe my disc capacitor is bad? I'll keep fiddling with it, but so far no output wattage. At least it didn't smoke, hi..
73, Bill - NT9K
SKCC #1926c69t9was8hofdxq2dxc1
http://www.nt9k.com
NT9K
Member
 
Posts: 330
Joined: Sat Apr 01, 2006 9:25 am
Location: Melbourne, Florida, USA

Postby KD8JHJ » Tue Sep 21, 2010 4:21 pm

Bill, The Pro-Pump is a super key. Easiest to use and produces the best sounding code of my straight keys. Very well done!

I did a web serch on the Michigan Mighty mite after seeing yours. One builder wired in an LED to light upon TX, a neat idea. I think I will begin gather parts soon and give it a try. I love the sample picture you posted with the carefully bent connection wires.

Please let us know when you solve the puzzle.

73 Mike
KD8JHJ
Member
 
Posts: 25
Joined: Tue Nov 25, 2008 11:38 pm
Location: Galion, Ohio USA

mighty mite

Postby kf4tap » Tue Mar 29, 2011 2:22 am

Hi bill, it looks good! My first mighty mite was in 96. I picked up a old tv off the side of the back road. It had sockets for the transistors! I spent about a week stripping it and then used parts from the TV to build it. 80 meters with the colour burst rock, and a dipole 12 feet high. Those are great little circuits. Usually they'll fire up on the first key stroke.

keith
kf4tap
Member
 
Posts: 1
Joined: Tue Mar 29, 2011 1:54 am
Location: Al / Mo


Return to HomeBrew

Who is online

Users browsing this forum: No registered users and 1 guest

cron