[Lowfer] VLF

[jrusgrove at comcast.net]

Doug

Have bought a lot of ferrite from them in years past for a friend in Japan. Never a problem.

Jay

----- Original Message ----- 
From: "Douglas D. Williams" <kb4oer at gmail.com>
To: "Discussion of the Lowfer (US, European, &amp,UK) and MedFer bands" <lowfer at mailman.qth.net>
Sent: Wednesday, December 25, 2013 6:44 PM
Subject: Re: [Lowfer] VLF


> 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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