[Lowfer] Will be trying new allocation 29.499 kHz for tonight...

[Michael Sapp]

Jay & All:  I just recalled that the common mode chokes I have on my EWE are 
not very effective at VLF, their performance rolls off quickly below 
100kHz.... I do have one CM choke that 50 ohm series tested at 30dB 
attenuation at 30kHz on my e-probe.  I should switch it over to the EWE this 
afternoon for this evenings testing as the e-probe is dedicated to my boat 
anchor collection and not "essential" for that purpose. Question is whether 
it should go on the NE or SW  feed line of the EWE antenna....I may go with 
NE since I have Bob's captures from last night for potential comparison.....

So there is a chance I may be able to reduce my current noise level at 30 to 
60 kHz by an order of magnitude or two with some CM choke tinkering.....

73 Mike wa3tts



----- Original Message ----- 
From: <jrusgrove at comcast.net>
To: "Discussion of the Lowfer (US, European, &amp; UK) and MedFer bands" 
<lowfer at mailman.qth.net>
Sent: Saturday, March 01, 2014 7:45 AM
Subject: Re: [Lowfer] Will be trying new allocation 29.499 kHz for 
tonight...


> Bob, VLF enthusiasts
>
> Reviewed captures going back to 1800Z yesterday ... looking for signal 
> strength variation for the day > night transition. These are signal levels 
> (not s/n) as detected in SpectrumLab. Numbers are not calculated by SL but 
> are readings taken from the captures so could have slight (probably less 
> than a dB) human reading error. Local sunset was at 2240Z. Distance 218 
> miles.
>
> 1800Z  -65 dB
> 1830Z  -65 dB
> 1900Z  -65 dB
> 1930Z  -66 dB
> 2000Z  -67 dB
> 2030Z  -69 dB
> 2100Z  -70 dB
> 2130Z  -72 dB
> 2200Z  -70 dB
> 2230Z  -68 dB (sunset 2240Z)
> 2300Z  -68 dB
> 2330Z  -67 dB
> 0000Z  -68 dB
> 0030Z  -65 dB
> 0100Z  -65 dB
>
> Very gradual signal strength changes with no 'rapid' fading noticed.
>
> Jay W1VD  WD2XNS  WE2XGR/2  WG2XRS/2 WH2XBA/3
>
>
>
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