It's been there all along guys.
http://www.lairdtech.com/Products/EMI-Solutions/Ferrite-Products/Ferrite-Toroids/;
Hi Lee,
Laird does not have complete data on all of their cores. For example...
For higher power applications and to avoid heat, especially with unknown
load situations, we
For higher power applications and to avoid heat, especially with unknown
load situations, we want a core that has low loss tangent or high Q.
For good suppression, especially with unknown load situations, we want high
loss tangent and Q.
Should actually be:
For higher power applications and to
Thank you guys for your in depth comments on Laird. This now circles
back to what I attempted to say in the beginning. I do not believe we get
all the information we need as radio guys just from the data sheets. It
has been the collective wisdom of many including the posters here and
So who is this mysterious off brand ferrite supplier or is that a secret?
Carl
KM1H
- Original Message -
From: Lee K7TJR k7...@msn.com
To: topband@contesting.com
Sent: Tuesday, July 03, 2012 11:01 AM
Subject: Topband: Laird ferrites
Thank you guys for your in depth comments on
Just some information: Laird purchased Cushcraft in, I think, 2008. They
later sold the amateur line to MFJ, but kept the commercial products. Back
then, their web site was pretty bad for antennas. Its been getting better,
but still could ues a lot of work, but unlike the ferrite products, their
On 7/3/2012 8:01 AM, Lee K7TJR wrote:
I do not believe we get
all the information we need as radio guys just from the data sheets. It
has been the collective wisdom of many including the posters here and
mentors we have worked with and suppliers we have trusted that have
in the long
I do not know the ferrite suppliers name. I buy these toroids
already wound. What I do know is it is a Chinese company.
Lee K7TJR
So who is this mysterious off brand ferrite supplier or is that a secret?
Carl
KM1H
___
UR RST IS ... ... ..9 QSB
Another fundamental problem is that the excellent engineering books on
ferrites published between the 50s and 70s are essentially lost -- long
out of print and hard to find even in the best engineering libraries.
Some of what I've learned and published was well known in the 50s, but
it died
Has anyone ever seen or can point us to a decent treatise on identifying
UFOs? That would be: Unidentified Ferrite Objects.
Yes, I can throw a few turns on a UFO and sweep it and zero in on the
material, maybe make an educated guess at that point as to the manufacturer,
check his data sheets
I agree there are few people who have contributed more to ham radio as ON4UN
and challenge anyone to show me an engineering text or any academic text with
no errors or omissions. And I personally found the various editions of the Low
Band series to be far more useful, educational and well
Since the topic of ferrite seems to be at the top of the lists focus
I'd like to ask about what ferrite mix to use at the feed of a small rx loop I
have built
this is NOT a shielded loop
with the break in the shield half way around the loop
I made the loop out of the 2 turns of 5/8 inch
http://bjbyhg.net/news.php?Ive212.img
___
UR RST IS ... ... ..9 QSB QSB - hw? BK
On 7/3/2012 9:05 AM, ZR wrote:
In the 80's Ferroxcube and Siemens were into the act and some of that
stuff Ive seen here not too long ago.
The textbooks I know of are three by E. C. Snelling, and are referenced
in my tutorial. KC9GLI, then a prof at U of Chicago, found a copy of
the first
At a hamfest years ago I saw some UFO's on a table.
Me: What kind are they?
Vendor:I don't know, what's best?
Me: People seem to like type 43 for HF/VHF and 31 for MF/HF suppression.
Next time I walk by the table, all of the UFOs were miraculously
identified and labelled. Why, he even had
There are parts of the third world where ham homebrewing is based around three
standard toroids: the one from a TV 75/300 balun, the yellow one from a PC
power supply, and the green one from a PC power supply.
And here we bm that we don't have u' and u'' curves.
Tim N3QE
Don't open this. Delete it. It contains a VIRUS ! !
de Price W0RI
From: Archibald C Doty Jr ar...@aol.com
To: topband-ow...@contesting.com; k...@comcast.net; TopBand@contesting.com;
efweing...@charter.net; l.f.h.e.n.s@earthlink.net
Sent: Tue, July 3, 2012
,
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frommmg myk rVjer***8imrtu zon Wireless Phoneu
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___
UR RST IS ... ... ..9 QSB QSB - hw? BK
What do you mean 3rd world? That describes the majority of the USA, present
company excepted, but here they throw in a TV or monitor flyback!
Carl
KM1H
- Original Message -
From: Shoppa, Tim tsho...@wmata.com
To: topband@contesting.com
Sent: Tuesday, July 03, 2012 3:11 PM
Subject:
I think my point was, we haven't always been so sophisticated either. Wes
Hayward's article on toroids in Jan 1968 QST discusses the Indiana General
sales policy to hams, then says The remainder of this discussion will show the
experimenter how he can fabricate his own toroid cores from
Sam Morgan wrote:
Since the topic of ferrite seems to be at the top of the lists focus
I'd like to ask about what ferrite mix to use at the feed of a small rx
loop I
have built
You might want to look at the feed technique described here:
Id forgotten Indiana General and their famous Q-1 cores, that was my first
attempt at Beverage matchingseems eons ago.
OTOH, Hayward was 44 years younger and a bit of a frugal type in keeping
with QST tradition. Whatever worked was good, no matter what, and test
equipment was very scarce
Speaking of ferrite RX loops...
I picked up the July 2012 issue of Popular Communications from the local
grocery store's magazine rack, just to see what the unusual antenna on the
front cover was all about. It's called a ferrite sleeve loop, and is made
from a bunch of ferrite rods arranged into
Don't knock those deflection yoke cores! :-)
I've used a lot of those for RFI suppression over the years, especially the
last place I worked. They started calling me a wizard there after a
simple trifilar winding of #10 THHN around one of those ferrite cores
allowed their CNC machine tool
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