On 9/2/2018 6:28 PM, Bill Frantz wrote:
This is one of the clearest explanations I have seen of the issue. Thanks Erik.
I guess you never saw mine, upon which Erik's is based. I first
published this in 2005!
73, Jim K9YC
__
Elecra
Here is another good information source on baluns and specifically the
type of material and how it performs under various conditions.
http://www.karinya.net/g3txq/chokes/
As it is said "I have no dog in this fight".
73
Bob, K4TAX
On 9/2/2018 8:28 PM, Bill Frantz wrote:
This is one of the
This is one of the clearest explanations I have seen of the issue. Thanks Erik.
73 Bill AE6JV
On 9/2/18 at 5:53 PM, ebasil...@cox.net (Erik Basilier) wrote:
> As Jim K9YC has pointed out in his writeup on baluns etc, there is a
> threshold effect when one applies a choke to reduce common mode cu
As Jim K9YC has pointed out in his writeup on baluns etc, there is a
threshold effect when one applies a choke to reduce common mode current. The
current is determined by driving voltage and total (complex) series
impedance. The choke RF impedance will have a reactive as well as a
resistive compone
Back in my early days as a ham (1950s), I inadvertently discovered that
the metal housing of a D104 microphone was very effective in performing
such a touch test.
Bob, N7XY
On 9/2/18 7:19 AM, John Oppenheimer wrote:
On 09/02/2018 07:56 AM, Don Wilhelm wrote:
That W3EDP antenna is a strong s
On 9/2/2018 7:39 AM, Martin wrote:
FT 140-43 cores will do. For higher power, use FT 240-43.
#43 material is only good above about 10 MHz.
73, Jim K9YC
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
H
You might want to add a common mode choke.
Look here :
http://www.dg0sa.de/balun1zu4kleinptfe.pdf
It is in german, but the pictures show how easy it is to do. First, the
choke is shown.
The second core is the 4:1 transformer which you already have.
FT 140-43 cores will do. For higher power, us
On 09/02/2018 07:56 AM, Don Wilhelm wrote:
> That W3EDP antenna is a strong suspect, as is any off-center fed antenna
> or end fed antenna. They can produce large amounts of RF in the shack.
Hi Gwen,
Don is correct. The W3EDP with a large choke Balun, as pictured, between
the Unun and KX3 is an
Gwen,
First of all, a T200-2 is an iron core toroid, not ferrite, and is not
likely to prevent much RF noise coupling. Any ferrite core will have an
FTxxx diameter designation with two digits after the hyphen.
That W3EDP antenna is a strong suspect, as is any off-center fed antenna
or end f
From: Gwen Patton Date:
9/1/18 10:00 PM (GMT-06:00) To: elecraft@mailman.qth.net Subject: [Elecraft]
Data transmission on 30 meters with PX3 problem
This happens very rarely for me EXCEPT for 30 meters. Then it happens so
much, it makes data modes (CW, RTTY, PSK) useless. I'm using a
This happens very rarely for me EXCEPT for 30 meters. Then it happens so
much, it makes data modes (CW, RTTY, PSK) useless. I'm using a wired USB
keyboard connected to the PX3. If I'm on 30 meters, and I use the ATU to
match the antenna, transmitting any data mode causes extra, spurious
characters
11 matches
Mail list logo
