Re: [IRCA] [ABDX] Common-Mode Choke Designed for MW DXing

[Mark Durenberger]

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: a...@yahoogroups.com
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 l...@highnoonfilm.com [ABDX] 
<a...@yahoogroups.com> wrote:


In response to several requests from both MW DX’ers 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 isn’t possible. In contrast, these 
chokes are designed to work over a limited range of frequencies. In this 
case it’s 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, it’s 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 can’t 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.



__._,_.___
Posted by: Les Rayburn <l...@highnoonfilm.com>
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Re: [IRCA] [ABDX] Common-Mode Choke Designed for MW DXing

[Brandon Jordan]

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 l...@highnoonfilm.com [ABDX] 
>  wrote:
> 
> In response to several requests from both MW DX’ers 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 isn’t possible. In contrast, these 
> chokes are designed to work over a limited range of frequencies. In this case 
> it’s 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, it’s 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 can’t 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. 
> 
> 
> __._,_.___
> Posted by: Les Rayburn 
> Reply via web post•   Reply to sender 
> •   Reply to group  •   Start 
> a New Topic   •   Messages in this topic (1)  
>  
>  
> Upgrade your account with the latest Yahoo Mail app
> Get organized with the fast and easy-to-use Yahoo Mail app. Upgrade today!
> The ABDX website www.abdx.org!
> VISIT YOUR GROUP
> • Privacy • Unsubscribe • Terms of Use 
> .
>  
> 
> __,_._,___
___
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IRCA@hard-core-dx.com
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Be sure to register now for the Joint DX Convention
Kansas City, September 9 to 11.  Hotel space is filling up.
Registration info:
http://www.nrcdxas.org


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

For more information: http://www.ircaonline.org

To Post a message: irca@hard-core-dx.com