[Lowfer] VLF

[Douglas D. Williams]

Thanks Todd.

A large ferrite tuned loop is something I've been meaning to try "when I
have the time".

Any of you men ever do business with this company?

http://www.stormwise.com/index.html

-Doug



On Wed, Dec 25, 2013 at 4:15 PM, Todd Roberts <toddroberts2001 at aol.com>wrote:

>
> Hi Jay,
> All good points on VLF reception. Congratulations on your good copy of SAQ
> this Dec 24.
> Conditions here in coastal SC were not very good that night with local
> rain and high static at
> the time so I did not attempt to try for SAQ.
>
> One thing I have found in the past that works very well on VLF  is to try
> to have a very high front end RF
> selectivity. That seems to help limit static crashes from getting into the
> receiver front end and causing
> more trouble down the line although having high I.F. selectivity and a
> good noise blanker in the receiver helps
> a lot also.
>
> Some of the best reception I have had in the past of SAQ was using a very
> high-Q ferrite-core loop antenna.
> The one I used was built from a kit by Jim Hagan that he sold a number of
> kits back in the 80's. It has several high-Q ferrite rods glued together
> for an equivalent rod of almost 30 inches in length. The RF bandwidth of
> the loop is very narrow I
> would say a few hundred Hz at the most down around 17 kHz. This gave a
> very high front end RF selectivity.
>
> Running the receiver and antenna on batteries can help a lot also. If at a
> home location kill the main breakers
> for house power.
>
> Someone might experiment with a regenerative RF  preamp also for a similar
> effect on VLF when used with
> a different antenna.
> 73 - Todd WD4NGG
>
>
> -----Original Message-----
> From: jrusgrove <jrusgrove at comcast.net>
> To: Discussion of the Lowfer (US, European, &amp; UK) and MedFer bands <
> lowfer at mailman.qth.net>
> Sent: Wed, Dec 25, 2013 12:09 pm
> Subject: [Lowfer] VLF
>
>
> Andy
>
> After many years chasing VLF signals I've come to the conclusion that the
> best
> approach is to use
> the smallest antenna possible ... the main requirement being that the
> antenna
> should be able to
> produce sufficient 'band noise' to overcome the receiver noise. A small
> antenna
> minimizes the amount
> of  noise pickup thereby easing the noise mitigation that must be carried
> out.
> Small 'amplified' e
> probe or loop antennas are ideal for this application.
>
>
>
>
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