Welcome to new 160m band blog

This blog is the replacement of the my preview Topband blog here http://topband.blog.cz/ because of an aggressive advertising and flash banners inserted by the blog provider. For older posts access You can visit the old blog link which will exist still... but it will not be updated anymore.

Effective from 1st Jan 2017 please paper QSL via OM-bureau only.


Tuesday, October 18, 2016

The 470Ohms resistors for Beverages...

Hello all,

I noticed that the terminating resistor value and material/type for good working Beverage receiving antenna for low bands DX-ing is never ending story and object of many discussions and internet threads so I decided to post over here few useful information in order to help those guys who do not want to spend annoying time to browse and investigate about this topic.

Why Composition Types?
http://www.w8ji.com/beverages.htm

The important is to look for carbon composition / ceramic composition resistors at 2W power rating at least. The Ohmite has their OY series / 2W for example.

Mouser:
588-OY-470-E
http://eu.mouser.com/Search/ProductDetail.aspx?qs=K%2fk%252b2unYRtW4en7Bt3IFdQ%3d%3d



Mouser   10 pack for $16.20
http://www.mouser.com/ProductDetail/Ohmite/OY471KE/?qs=sGAEpiMZZMvmQ%252bOLa8n%2fM0AL619UxluYs%252bchll6qvbU%3d



Farnell / Newark:
64K5431
http://www.newark.com/ohmite/oy471ke/resistor-ceramic-470-ohm-2w-10/dp/64K5431



The resistors datasheet:
http://www.ohmite.com/cat/res_ox_oy.pdf



It is highly recommended to put a 75V 10 kA GDT in parrallel with the resistor at the end of the beverage antenna. The 10 pack at $1.41 and it will last a long time in the field.

http://www.mouser.com/ProductDetail/EPCOS-TDK/EC75X/?qs=sGAEpiMZZMsdWQmBKEIh8ovqZm0VvzvZWNULxtUqFew%3d

More info links:
http://www.w8ji.com/beverages.htm
http://www.w0btu.com/Beverage_antennas.html
http://n1eu.com/topband/BeverageTips.htm
http://www.qsl.net/wa1ion/bev/bev_remote_term.htm

Hope it helps,

73 - Petr, OK1RP
http://ok1rp.blogspot.com