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From: k2ors@comcast.net (Warren K2ORS/WD2XGJ)
To: rsgb_lf_group@blacksheep.org, rsgb_lf_group@blacksheep.org
Cc: Joe Craig <jcraig@mun.ca>
Date: Sun, 09 Apr 2006 20:00:54 +0000
Message-Id: <040920062000.6846.443967F60000A7EC00001ABE22073007930B97010D0A020E06979D0E03@comcast.net>
Subject: Re: LF: Miniwhip and Intermod
Sender: owner-rsgb_lf_group@blacksheep.org
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Reply-To: rsgb_lf_group@blacksheep.org
Status: O


Joe,

     I spoke to Ted Holdahl KC3OL the other day, he added a 100uH choke in series with the output of the Miniwhip amplifier. This greatly knocked down AM MW signals - perhaps that would help in your case (if the intermod is due to MW).

--
73 Warren K2ORS/WD2XGJ
FN42hi
http://www.w4dex.com/wd2xgj.htm

 -------------- Original message ----------------------
From: Joe Craig <jcraig@mun.ca>
> Dear Group,
> 
> I recently built Roelof's miniwhip e-probe and reported on
> the reflector that there was trouble with intermod when
> close to MF AM transmitter sites.  This problem originates
> with the receiver and not the probe itself.
> 
> This was verified by attenuating the output of the probe
> and hearing signals on 137 kHz what could not be heard
> without the attenuator because of interference.
> 
> Thanks to Roelof for a good design and sharing it those who
> asked and his tip about the attenuator!  Thanks also to the
> kind VE3 who sent me the semiconductors I was having trouble
> locating whin building the PA0RTD miniwhip.
> 
> 
> Still QRV on 137.777 kHz sending 'N' at QRSS60 after sunset.
> 
> 73
> Joe VO1NA
> 
>