Im using the LF Engineering L400B for VLF in Alaska, which Ive owned and dragged around for the past ten years or so; its (>600kHz) filtering before the first 2N device has stopped all the mixing products (8, 20,30,40, 50, 60 Khz) from 500-600Khz bcst I had with the PA0RDT -
I am pushing the limit on mixing products as nearby Alaska has a few 10Kw Blowtorches and its unfair treatment for an unfiltered input device (save that dang resistor!); I use the PAORDT here in Oklahoma and no issues with unwanted products.
Laurence KL7 UK KL7 UK/5
Date: Tue, 5 Oct 2010 11:43:19 -0400
From: [email protected]
To: [email protected]
Subject: Re: VLF: Inspire VLF-3 receiver
Hello Daniele,
Also please see LF Engineering:
http://www.lfengineering.com/
--
73 Warren K2ORS
WD2XGJ
WD2XSH/23
WE2XEB/2
WE2XGR/1
On Tue, Oct 5, 2010 at 11:17 AM, Warren Ziegler <[email protected]> wrote:
Hello Daniele,
A couple of possibilities for a quick and easy whistler receiver:
1) The McGreevy W3 available already built in a case or as a circuit board: http://www.auroralchorus.com/wr3gx2.htm
2) The North Country Earth Receiver: http://www.northcountryradio.com/Kitpages/elfrcvr.htm
3) Ten-Tec used to make a high gain audio amplifier kit, I don't see it on their web page at the moment but perhaps you can find one?
Personally I have the North Country receiver, it works fine but I can't get to quiet locations all that often, my best results have been at the seaside away from power lines.
--
73 Warren K2ORS
WD2XGJ
WD2XSH/23
WE2XEB/2
WE2XGR/1
On Tue, Oct 5, 2010 at 11:00 AM, Daniele Tincani <[email protected]> wrote:
Hello Warren,
yes, I see. However, I did not intend to use the VLF-3 for sub-9KHz ham radio listening, rather I'm looking for a VLF reception solution that I could possibly move away from domestic noise and take with me for a walk in the countryside.
My reasoning is: I'm pretty sure :-) that I have hum at home affecting reception below 10KHz. I will try a small passive HPF just to see if it improves things a bit, but I'm not confident about this attempt, given that probably the noise is not generated by saturation in the pre-amp or the soundcard. Of course the pre-amp and the soundcard have their own noise floor, but it seems to me that external noise is well above it. Given this situation, I think that no home-based receiver could really remove the problem at my current location.
On the other hand, I live in a jointly-owned building, at 5th floor, so it would be not "politically" easy to install a long coax cable across the property and up to my balcony :-). More complex solutions like remotely-interfaced antennas, etc. are out of my budget for VLF at present (in terms of spare time for study, setup, etc. :-)).
In summary, while trying to improve my current loop and pre-amp, I think that building an E-probe could add a bit to my current experience with VLF "antennas" and could probably result in a more handy solution for "in-the-field" listening sessions.
I'm interested in a portable VLF receiver (more general-purpose than VLF-3, if possible). Ready-to-mount kits are preferable because of the short free-time I have for homebrewing. Please suggest any suitable solution that you could have information on.
Cheers
D.
From: Warren Ziegler <[email protected]>
To: [email protected]
Sent: Tue, October 5, 2010 4:09:01 PM
Subject: Re: VLF: Inspire VLF-3 receiver
Daniele, The Inspire kit is a broadband high gain audio amplifier with a very high input impedance - generically its a 'whistler receiver'. Whistler receivers like Inspire are good for listening to whistlers, tweeks, dawn chorus etc but it would be completely useless for listening to amateur VLF experiments - its broadband, has no 'bfo' to detect a carrier and would be difficult to interface to a sound card. -- 73 Warren K2ORS WD2XGJ WD2XSH/23 WE2XEB/2 WE2XGR/1
On Tue, Oct 5, 2010 at 4:43 AM, Daniele Tincani <[email protected]> wrote:
Hi VLF,
any opinions about the Inspire VLF-3 receiver kit?
Thank you in advance for your feedbacks.
Regards
Daniele
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