TV Fool  

Go Back   TV Fool > Over The Air Services > Help With Reception

Notices

Reply
 
Thread Tools
Old 15-Oct-2014, 9:30 PM   #1
Stereocraig
Senior Member
 
Join Date: Sep 2012
Posts: 466
Which Style Balun Is Better?

My choices for a DIY, would be between the standard 4:1 x-frmr and the PCB type.

I know that the PCB style would be more sturdy/ dependable, but what about matching and SWR, etc?

Thanks,
Craig
Stereocraig is offline   Reply With Quote
Old 15-Oct-2014, 9:34 PM   #2
rabbit73
Retired A/V Tech
 
Join Date: Aug 2012
Location: S.E. VA
Posts: 2,280
The 4:1 transformer balun works well for VHF & UHF; the PCB balun works better for UHF than for VHF. The new UHF antennas with a built-in PCB balun don't pick up VHF channels as well as the older UHF antennas that used a separate 4:1 transformer balun.

So, it really depends upon your application.

If you need a low-loss balun for one channel, then the best choice is a DIY halfwave 4:1 coaxial balun cut for the frequency of that channel.

http://www.hdtvprimer.com/antennas/temporarypage.html

http://www.digitalhome.ca/forum/show...&postcount=761
Quote:
Awhile back, ADTech said that NEWER 91XG used a Printed Circuit Board (PCB) balun which uses unequal stripline delays to form the equivalent of a Coax Balun, which ONLY works on UHF Band and severely attenuates Hi-VHF. You probably could figure out a way to replace the PCB Balun....perhaps ADTech can help...
http://www.digitalhome.ca/forum/show...10&postcount=3
Quote:
DB4e and DB8e use PCB (Printed Circuit Board) Baluns, which are VERY lossy in Hi-VHF Band, which is something NOT modeled by 4nec2:
__________________
If you can not measure it, you can not improve it.
Lord Kelvin, 1883
http://www.megalithia.com/elect/aeri...ttpoorman.html

Last edited by rabbit73; 15-Oct-2014 at 10:10 PM.
rabbit73 is offline   Reply With Quote
Old 16-Oct-2014, 7:02 AM   #3
Stereocraig
Senior Member
 
Join Date: Sep 2012
Posts: 466
Thank you for a great explanation, Rabbit!
Stereocraig is offline   Reply With Quote
Reply

Bookmarks

Go Back   TV Fool > Over The Air Services > Help With Reception


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off




All times are GMT. The time now is 10:37 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Copyright © TV Fool, LLC