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Re: LF: 136.172 khz 15oct11

To: [email protected]
Subject: Re: LF: 136.172 khz 15oct11
From: Dexter McIntyre W4DEX <[email protected]>
Date: Sun, 16 Oct 2011 00:27:55 +0000
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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




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