Jim,
I apologize: I made a typo in my post. It should have said "...the highest
choking IMPEDANCE is usually obtained with an air core choke (coax looped
with or without some form like PVC)". Maybe this is an over-statement, but
of the few chokes I have tested, air core chokes made with just stand
Folks - we are now at 10 posts in a storp period on this OT thread.
Let's close the thread now in the interest of lowering email overload for our
other readers. Please take it to direct email as needed.
73,
Eric
Moderator
/elecraft.com/
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On Wed,5/24/2017 9:39 AM, Bill Leonard N0CU wrote:
Two of the
main trade offs are bandwidth and choking impedance. The highest choking BW
is usually obtain with an air core choke (coax looped with or without some
form like PVC). However, this approach is very high Q, which yields
relatively low
Mike,
Wes raises one of the many interesting aspects of balun design, and not
surprisingly, one that there doesn't appear to be a consensus on. Two of the
main trade offs are bandwidth and choking impedance. The highest choking BW
is usually obtain with an air core choke (coax looped with or with
Well, I would prefer one that presented a high resistive impedance with no
resonance at all:-)
Wes N7WS
On 5/22/2017 10:54 PM, Jim Brown wrote:
Yes, really.
Jim
On Mon,5/22/2017 10:15 PM, Wes Stewart wrote:
Really?
On 5/22/2017 4:25 PM, Jim Brown wrote:
Common mode chokes are used ne
Yes, really.
Jim
On Mon,5/22/2017 10:15 PM, Wes Stewart wrote:
Really?
On 5/22/2017 4:25 PM, Jim Brown wrote:
Common mode chokes are used near resonance...
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Really?
On 5/22/2017 4:25 PM, Jim Brown wrote:
Common mode chokes are used near resonance...
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This only works at low frequencies, well below resonance of the choke
that you've wound. AND -- it only yields the AL value at low
frequencies. Many materials with very different mu and mu' curves have
similar low frequency performance. Common mode chokes are used near
resonance, which is far
Mike,
You may be over-thinking it.
Wrap 10 turns around the core and measure its inductance.
From that data, you can calculate the AL value. Match that AL value
against a chart of the values for various cores.
73,
Don W3FPR
On 5/22/2017 9:30 AM, Michael Walker wrote:
All
I am doing some
On Mon,5/22/2017 6:30 AM, Michael Walker wrote:
I have a tracking generator, so I am trying to figure out a test jig. Do
I just wrap the choke in fleedline, have a common ground and then use the
shield of the feedline to feed my signal over looking for the attenuation
on the receiving end of th
All
I am doing some work on a box of chokes I received and I am trying to
figure out just exactly what mix they are.
Since I run a remote station, I choke everything. I know the chokes I buy
and what they are, but it is the unknown box that needs testing.
I have a tracking generator, so I am tr
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