Message-ID: <4E9A250B.4050609@gmail.com>
Date: Sun, 16 Oct 2011 00:27:55 +0000
From: Dexter McIntyre W4DEX <dexter.mc@gmail.com>
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Subject: Re: LF: 136.172 khz 15oct11
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Stefan Schäfer wrote:
> BTW, Dex, nice webpage and photos! Real amateur radio!
Thanks for the kind words Stefan.  I consider myself to have a good 
basic understanding of electronics and RF but have to depend on people 
like you to do the design work.  The people on this and other radio 
groups have helped me tremendously.  If I were forced to name a few it 
would be W1TAG and W1VD.


> And BTW what is your RX system you use on LF?

Recently I've been using an Icom R-75 receiver with no added options.  I 
was considering either adding the high stability oscillator or locking 
it to an external timebase.  But the receiver has been so drift free I 
see no advantage in improving it.  I also have a HP-3586B and a W/G 
SPM-19.  For weak signal LF reception all perform the same.

Presently I'm down to two LF antennas for receive.  The tuned transmit 
antenna and a vertical wire of about 20 meter length over a tree limb.  
This wire is located close to 200 meters from my house in a wooded 
area.  The wire is connected to a ground rod through a high to low 
impedance transformer.  75 ohm coax brings it to the house where the 
coax is isolated with a 1:1 transformer.  Seldom can I see any 
difference between these two antennas for LF reception.  A PAØRDT 
mini-whip works great for portable use but I can't easily get it above 
the large oak trees surrounding my house.

I need to repair my balanced fed loop which has sustained ice and 
falling limb damage.  Having a null in the pattern has improved 
reception in some directions.

I'm looking forward to seeing a signal from that new coil!

Looks like my QRN source is from Cuba tonight.

Dex