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Re: [IRCA] [ABDX] Common-Mode Choke Designed for MW DXing
Would this be called a "Current Balun?"
Regards,
Mark Durenberger
There's SO much I still don't know!
-----Original Message-----
From: Brandon Jordan
Sent: Wednesday, April 27, 2016 3:43 PM
To: ABDX@xxxxxxxxxxxxxxx
Cc: AMFMTVDX - amfmtvdx@mailman_qth_net ; National Radio Club NRC
am@nrcdxas_org ; IRCA Radio List - irca@hard-core-dx_com
Subject: Re: [IRCA] [ABDX] Common-Mode Choke Designed for MW DXing
Thanks Les. I just ordered one of these. I also asked the vendor if they
would consider making a similar common-mode choke for 10-500 kHZ.
I have some local noise which is generally only an issue during daytime when
signal levels are low. I am pretty sure it is locally generated. The DX
Engineering choke I purchased was no help, but it requires a ground. Perhaps
the 4' ground and radials were not sufficient for the unit, or the noise is
not actually local to my house.
On Apr 27, 2016, at 10:25 AM, Les Rayburn les@xxxxxxxxxxxxxxxx [ABDX]
<ABDX@xxxxxxxxxxxxxxx> wrote:
In response to several requests from both MW DXâers and 160 Meter
enthusiasts, MyAntenna.com has added a new receive-only common-mode choke
to their line of impressive products. This common mode choke can be
inserted anywhere in the feed line to your BOG, active whip, loop, etc.
The choke blocks unwanted noise that is often picked up by the coax as it
travels from the antenna back to your shack.
Many manufacturers claim that their chokes will work over impossible
bandwidth of frequencies, which simply isnât possible. In contrast, these
chokes are designed to work over a limited range of frequencies. In this
case itâs 500 KHz to 10 MHz.
Common-mode attenuation: ~37dB
Choking Impedance >5,000 Ohms
The choke will allow DC power to pass through to active antennas, and can
be inserted anywhere in the feed line, including inside the shack. For
best results, itâs recommended that the choke be installed about 20 feet
from the antenna. I have no financial relationship with the company, but
am a satisfied customer.
http://myantennas.com/wp/product/cmc-0510-r/
If you have EMI/RFI problems or just want to reduce the noise floor to
your receiver, you canât go wrong by installing good quality common-mode
chokes in your system.
73,
Les Rayburn, N1LF
121 Mayfair Park
Maylene, AL
EM63nf
Member WTFDA, IRCA, NRC. Former CPC Chairman for NRC & IRCA.
Elad FDM-S2 SDR, AirSpy SDR, Quantum Phaser, Wellbrook ALA1530 Loop,
Wellbrook Flag, Clifton Labs Active Whip.
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Posted by: Les Rayburn <les@xxxxxxxxxxxxxxxx>
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Be sure to register now for the Joint DX Convention
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Registration info:
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Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers
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