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22831
Re: Converting RIAA phono preamps for VLF usage Hi Mark, Thanks for the answer/info. FYI: the preamp has switchable input impedance and is for magnetic cartridges, input impedances are 47kohm./120pf or
pjmoondog
11:09 AM
#22831
 
22830
Re: Sebring/Cape Coral/Surfisde comparisons. ... Yes there was a problem with a full disk on the server. Reason was that the transfer to cloud storage stopped working and data piled up until the disk
Paul
Apr 14
#22830
 
22829
Re: Converting RIAA phono preamps for VLF usage Hi, First of all, it depends on what you mean by VLF, and secondly, whether the preamp is designed for a magnetic or ceramic cartridge. The RIAA curve adjusts
Mark Karney - VLF
Apr 14
#22829
 
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22828
Converting RIAA phono preamps for VLF usage Hi all, As the subject title says, does anyone have any clues on how to convert a RIAA phono preamp for use as a VLF antenna preamp...I have one going spare
pjmoondog
Apr 14
#22828
 
22827
Re: Response time for the ionosphere to X-ray flare Hi Peter Not a stupid question at all because for the exact details it is certainly going to matter which of these frequency ranges to take. I don't know for
Richard
Apr 14
#22827
 
22826
Re: Response time for the ionosphere to X-ray flare Hi Richard, ... I do not understand the math. So may be it's a stupid question: Referring to Fig.1. Did you fit your model against the "1-8A"-data or against
df3lp
Apr 14
#22826
 
22825
Re: Grundig/Eton Satellit 750 Radio, below 100 kHz Hej, Does anyone know if it's possible using the front controls and push buttons to tune the above radio below 100 kHz?   Regards, Tor Hvide Sande I
TOR SCHOFIELD
Apr 14
#22825
 
22824
Re: Response time for the ionosphere to X-ray flare Dear all, I did some more work on the chapman analysis of the reflecting layer with time dependence. The analysis seemed to indicate there should be a damping
Richard
Apr 14
#22824
 
22823
SUMMARY: Geomagnetic Sudden Impulse Space Weather Message Code: SUMSUD Serial Number: 190 Issue Time: 2014 Apr 14 0624 UTC SUMMARY: Geomagnetic Sudden Impulse Observed: 2014 Apr 14 0612 UTC
SWPC Product Subscription Service
Apr 13
#22823
 
22822
Sebring/Cape Coral/Surfisde comparisons. Paul, dont know if this is by design, but Sebring is not triggering the comparator at http://abelian.org/vlf/wc131116.shtml
ssshoema
Apr 13
#22822
 
22821
Download free book: Ionospheric Radio Propagation by Davies Kenneth Follow this link https://archive.org/details/IonosphericRadioPropagation Claudio -- Claudio Pozzi - Happy Linux User - http://www.qsl.net/ik2pii
Claudio Pozzi
Apr 13
#22821
 
22820
Electron Levels, Solar Wind Charging Effect, and Whistlers The electron flux level is really plummeting: possibly due to the sustained southward facing (negative) element of the solar wind for 14 hours. I have noticed
Shawn
Apr 11
#22820
 
22819
Re: Response time for the ionosphere to X-ray flare ... I know this paper, thanks for the others. Claudio -- Claudio Pozzi - Happy Linux User - http://www.qsl.net/ik2pii
Claudio Pozzi
Apr 11
#22819
 
22818
Re: Picking up whistlers h I'm hearing a few whistlers again this evening on the home receiver. I would guess they are S3 in strength at a quiet recording location away from power
Shawn
Apr 10
#22818
 
22817
Re: Picking up whistlers h Hi Mike, There were hundreds of whistlers here in Colorado. I noted several dozen of the best whistlers I recorded last night (4/10/2014) in Colorado. All
vlfkorgan1
Apr 10
#22817
 
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22816
Re: Picking up whistlers h ... Kevin, Scott & Shawn - On the off chance you might have a local archive of last night, I've posted all the whistlers I received here in Forest, VA (29
Mike Smith
Apr 10
#22816
 
22815
Re: Picking up whistlers h Several whistlers received on all USA streams although not all had enough S/N to trigger the detector. A couple of combined images
Paul
Apr 10
#22815
 
22814
Re: Picking up whistlers h I use the following to keep track of lightning activity in the Southern hemisphere:
vlfkorgan1
Apr 10
#22814
 
22813
Re: Picking up whistlers h I'm using a nasa inspire receiver here in hawley, tx The receiver gets its feed from a 20 foot high antenna constructed from a length of aluminum pipe in a
Rahtdrgn
Apr 10
#22813
 
22812
Re: Picking up whistlers h What resource are you using for lightning observations in the southern regoin?
ssshoema
Apr 10
#22812
 
22811
Re: Picking up whistlers h The lightning activity in the South Pacific generating the whistlers last night was located just slightly East of 40 S Latitude and 120 W Longitude. Thank you,
Shawn
Apr 10
#22811
 
22810
Re: Picking up whistlers h I noticed a large number of whistlers last night as well here in Colorado on the home receiver. They began a little before sunset; I packed up and headed out
Shawn
Apr 10
#22810
 
22809
Re: Response time for the ionosphere to X-ray flare Hi, The following paper is interesting, http://newserver.stil.bas.bg/SUNGEO/00SGArhiv/SG_v8_No1_2013-pp-27-31.pdf Authors observed that the D-region ionosphere
tamal basak
Apr 10
#22809
 
22808
Re: Picking up whistlers h Surfside and Cape Coral also had some that did not trigger at Abelian. After reviewing mine they were very low. Can't wait for the VLF3 to get here and move
Scott Shoemaker
Apr 10
#22808
 
22807
Re: Picking up whistlers h It looks like seabring, you and I were catching many of the same events. Interesting evening! Kevin Palivec Http://centexallsky.blogspot.com Sent from my iPad
Rahtdrgn
Apr 10
#22807
 
22806
Re: Picking up whistlers h ... The same happened in Virginia. Mike
Mike Smith
Apr 10
#22806
 
22805
Picking up whistlers h Getting an unusual amount of whistlers this evening in Texas
Rahtdrgn
Apr 9
#22805
 
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22804
Re: Where to purchase a VLF receiver North Country Radio also offers an ELF Earth Receiver, model ELFRCV. $65 kit form or $107 Assembled. The broadband active pre-amp model I was referring to is
lowalacrity
Apr 8
#22804
 
22803
Re: Where to purchase a VLF receiver Just posted my VLF receiver on Ebay. It is a Rycom R1307 A/GR. Tunes 3 - 810 KHz. I'm including a Northcountry wide band pre-amp model EXTANT. Killer combo.
lowalacrity
Apr 8
#22803
 
22802
Re: Where to purchase a VLF receiver Thanks for the info. Regards, Robert Weisbloom
Robert Weisbloom
Apr 8
#22802
 
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