Four Times The Impedance Rule - UK Vintage Radio Repair and Restoration Discussion Forum

ms660 · 14th Dec 2015, 8:27 am

Came across this, might be useful:

http://www.***********/doc/116333646...iginate#scribd

EDIT: Whoops, just tried the link, doesn't work at my end....Googling the subject will take you to the article.

Lawrence.

Dave Moll · 14th Dec 2015, 9:59 pm

The web site would appear to be on the forum's exclusion list - hence being replaced by asterisks.

paulsherwin · 14th Dec 2015, 10:09 pm

This forum blacklists some sites which offer free service data which is available from service-data.com. This is to restrict casual access and I'm sure members can circumvent the blacklist if they are sufficiently creative. Please do this via PM though, and not in the public forum.

AC/HL · 14th Dec 2015, 10:24 pm

Quote:

Originally Posted by pwdrive

Googling the subject will take you to the article.

It's now the second hit on Google. As is often the case we are the first.

ms660 · 14th Dec 2015, 11:05 pm

Thanks for the explanation, I can see (as it were) what you mean now, the site in that link I posted can give access to service data as well as the article I tried to post which wasn't service data as such.

Anyways the jist of it was about wideband transformers, a general rule of thumb, secondary reactance = 4 times the load impedance at the lowest frequency for roll off...or something similar, it was a first for me as I had not heard of that until today, hence my initial post.

Lawrence.

14th Dec 2015, 8:27 am	#1
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Four Times The Impedance Rule Came across this, might be useful: http://www.***********/doc/116333646...iginate#scribd EDIT: Whoops, just tried the link, doesn't work at my end....Googling the subject will take you to the article. Lawrence.

14th Dec 2015, 9:59 pm	#2
Dave Moll Dekatron Join Date: Feb 2005 Location: West Cumbria (CA13), UK Posts: 6,127	Re: Four Times The Impedance Rule The web site would appear to be on the forum's exclusion list - hence being replaced by asterisks. __________________ Mending is better than Ending (cf Brave New World by Aldous Huxley)

14th Dec 2015, 10:09 pm	#3
paulsherwin Moderator Join Date: Jun 2003 Location: Oxford, UK Posts: 27,947	Re: Four Times The Impedance Rule This forum blacklists some sites which offer free service data which is available from service-data.com. This is to restrict casual access and I'm sure members can circumvent the blacklist if they are sufficiently creative. Please do this via PM though, and not in the public forum.

14th Dec 2015, 11:05 pm	#5
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: Four Times The Impedance Rule Thanks for the explanation, I can see (as it were) what you mean now, the site in that link I posted can give access to service data as well as the article I tried to post which wasn't service data as such. Anyways the jist of it was about wideband transformers, a general rule of thumb, secondary reactance = 4 times the load impedance at the lowest frequency for roll off...or something similar, it was a first for me as I had not heard of that until today, hence my initial post. Lawrence.