Return to KLUBNL.PL main page
| To: | [email protected] |
|---|---|
| Subject: | Re: Re: VLF: 8270.002 |
| From: | "ing.lindo" <[email protected]> |
| Date: | Sat, 08 Feb 2014 11:14:29 +0100 |
| Authentication-results: | mx.google.com; spf=neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of [email protected]) smtp.mail=[email protected]; dkim=pass [email protected]; dmarc=pass (p=NONE dis=NONE) header.from=gmail.com |
| Delivered-to: | [email protected] |
| Dkim-signature: | v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=date:subject:message-id:importance:from:to:mime-version :content-type; bh=atRHUFfSmSt6l5CchYR6YZgomp/6nqhdef6txKXAH3M=; b=MexohbnEI2ZoRQXVwTsDK/rLBHrfwsTu9bze9tud6NKAkcGnqjCFa5yzdAFvm96MxU HGy77+xgpXQNi/6yx8QaTTu40HQLSOYBQogtqLbzeoA+JpZR92wDxlQXwsOLwQrzDdi2 kbR777ngmm2ZinMDw2KpNNBAB8/vPB7t1YBpLEg2Je1lSQFBoChhoLWgVEZAGaoe+yb5 EWACv5CYCOxS6k5r/yah+j05mjEy3iYGjjXXBw3STMt9K2FzjGmCo4NtOKZ7kHvZ48dU X4t2gI9YoTkF9IYCh/lEQdvnZPgmGWkqz6Ytu5m4YHHOIwrX/RzvNLIBZVu70Y8TLfny 615A== |
| Importance: | normal |
| Reply-to: | [email protected] |
| Sender: | [email protected] |
|
Hello Markus and LF, can we have some info on grounding arrangements on your vlf system? Thanks. Domenico, iz7slz -------- Original message -------- From: Markus Vester Date:08/02/2014 00:08 (GMT+01:00) To: [email protected] Subject: Re: Re: VLF: 8270.002 Thanks Jim!
My antenna's effective height measured at LF
is about 9 m. It will be slightly less at VLF due to increased
shielding by trees, my guess is ~ 8 m, giving 77 microohms radiation
resistance. Thus 0.3 amps would radiate 7 µW (EMRP) or 13
µW ERP.
Operating hours are a bit limited by
politeness to the neighbours who have to bear the acoustical
emission from the loading coil. The 8.3 kHz tone is not really loud
but quite penetrant. Here are a couple of pics of the present setup, with the
coil enclosed by two rubber bins and placed outside the
window:
Good luck with your forthcoming
experiments!
Best 73,
Markus (DF6NM)
Markus, Great
signal, congratulations. Was
your ERP ~ 5uW? I
had hoped to be operational (RX and TX) with the new stable oscillator last
weekend but work and other nuisances interfered. I hope to complete that work
this weekend, and try your TX stabilization technique next week; all of your
work in this area much appreciated. 73,
Jim AA5BW From: [email protected]
[mailto:[email protected]] On Behalf Of Markus
Vester Uwe, yes - the left
channel picks up the electric field near the antenna, using a 20 cm piece of
open wire (level about - 30dB at L1). Both generators are active: the test
signal generator feeds the phase reference to R5, and the digimode terminal
delivers the output to the PA through L5. Lubos, I was
positively surprised to see about 20 dB SNR on your excellent Apollon
temple receiver. Peter, I think the
signal did leave a 10 dB dash in your 238 µHz window. Not sure about that
47 uHz pixel, but the two-hour transmission would really
be too short for that bandwidth. No trace yet on
Stefan's new window, but this may well be due to the midday
propagation minimum which we have often experienced on 8970
before. Thank you all for the
grabbers and comments! Best
73, Markus
(DF6NM) Hi
Markus, so you feed
the left channel with your eradiated signs via a piece of wire
? what abt the
signal generator and the digimode modulator, is one of them switched
off? ga
Uwe Von: [email protected] oops - that should be
8270.002! Old habits persist ;-) 73,
Markus I'm currently running
a short test on 8970.002 Hz from 10 to 12 UT, using SpecLab phase-locked to
1-pps. The antenna is swinging in the wind so the current is a bit
variable (0.25 to 0.3 A), but the feedback scheme should keep
the radiated phase steady. So far a good peak has become visible at
OK2BVG. Best
73, Markus |
| <Prev in Thread] | Current Thread | [Next in Thread> |
|---|---|---|
| ||
| Previous by Date: | Re: Re: VLF: 8270.002, Markus Vester |
|---|---|
| Next by Date: | LF: Can you look for us tonight with OPDS on 74.3213?, Bob Raide |
| Previous by Thread: | Re: Re: VLF: 8270.002, Markus Vester |
| Next by Thread: | Re: Re: VLF: 8270.002, Markus Vester |
| Indexes: | [Date] [Thread] [Top] [All Lists] |
