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LF: VLF in Canada

To: [email protected]
Subject: LF: VLF in Canada
From: [email protected]
Date: Sat, 4 Apr 2015 20:03:36 -0230 (NDT)
In-reply-to: <[email protected]>
References: <[email protected]> <[email protected]> <CADW0j2=zFELVNR+bwXXo8uAiGB2706h25LXeX8oNmNXZ2cJKXA@mail.gmail.com> <[email protected]>
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Dear Group,

Last summer, my VLF CW signals were copied outside my back yard. Today,
using a Marconi XH-100 with a SRA-8 mixer & AD9850/Arduino LO and a National LF-10 preselector, the sigs could be clearly heard outside my town with a 20 metre wire aerial strung between the car and a road sign. For TX, the 100m wire (~15 m high) was coupled with 425 mH to a variac (2:1) in series with a 5:1 ferrite xfmr to the keyboard amp with the volume control set to 5 (about 30 watts).

This is DX record on 8.277 kHz for this station -- 1.25 km! I wonder how far away it could be copied with QRSS? Any TA attempt will have to wait until a higher Q tuning coil appears. The DC resistance of the current one is almost 1k and I think it has much series capacitance. It gets warm and emits an stench of ozone when in use.

73
Joe VO1NA

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