Forums :: Resources :: Features :: Photo Gallery :: Vintage Radio Shows :: Archives :: Books
Support This Site: Contributors :: Advertise

It is currently Mar Mon 25, 2019 11:03 pm

All times are UTC [ DST ]

Post New Topic Post Reply  [ 1 post ] 
Author Message
 Post subject: Modifying a Heathkit Dot Bar generator
PostPosted: Oct Wed 01, 2014 5:51 am 
User avatar

Joined: Jan Thu 01, 1970 1:00 am
Posts: 3423
Location: Olympia WA USA
I have one of the neat old Heathkit dot bar generators. The bad part is it only has 300 ohm outputs and so requires making an adaptor to hook to any of the newer sets.

I got a flash of brilliance (Or was that my brain filament opening?).
Drill a hole in the back of the case and install a balun backwards with the threads protruding out the caseing, and put a nut on it.
The other wires are run to where the 300 ohm is taken off the board and connected there with a short piece of twin lead.

No "F" connector needs to be installed on the back of the case. The threaded end of the balun takes care of that. A 6-8' RG59 jumper with slip on connectors and its ready to use on the newer sets, with only "F" connector inputs.

Now I can use either sets of leads to test sets.

One could also just eliminate the 300 ohm output and install a matching balun in the hole where the cable currently comes out also, then attach a balun to the end of the coax if you need to use it on an older set.

"The average family has 2.5 children. Where is the other .5 child?"

Post New Topic Post Reply  [ 1 post ]  Moderator: Chuck Schwark

All times are UTC [ DST ]

Who is online

Users browsing this forum: No registered users and 2 guests

Search for:
Jump to:  

Privacy Policy :: Powered by phpBB