[Premium-Rx] RF-590 VLF sensitivity improvement

[Carcia, Francis A HS]

Here is another option use the reference output from the 590 as the source
to drive the mixer block - up converter. Now there will be no drift issues
to deal with. fc

-----Original Message-----
From: premium-rx-bounces at ml.skirrow.org
[mailto:premium-rx-bounces at ml.skirrow.org] On Behalf Of
ToddRoberts2001 at aol.com
Sent: Wednesday, February 22, 2006 3:59 PM
To: premium-rx at ml.skirrow.org
Subject: Re: [Premium-Rx] RF-590 VLF sensitivity improvement

In a message dated 2/22/2006 3:52:34 PM Eastern Standard Time, 
n4vic at hotmail.com writes:
John,
Any ideas on improving the sensitivity of the RF-590 for VLF below 30 khz?
I 
have one that I love using but am new to VLF for monitoring.  I've used VLF 
for aeronautical navigation but thats all.  I'm not highly trained
technically, 
so something outboard of the receiver would be better for me even if I had
to 
build it.  Thanks.
N4VIC
Victor

Victor, I think using a high-quality up-converter in front of the RF-590 
would be the best way to go for full sensitivty reception of VLF below
30KHz.  The 
RF-590 already has outstanding sensitivity at MF-HF. Something that would 
convert 0-500KHz to 4.0-4.5 MHz is nice to have. AMRAD has a good converter 
design that was featured in QST. 73 Todd WD4NGG.

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