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Chris
I would say the wire gauge is too fragile. I would
use around 1mm wire plastic covered or enamelled, apart from the lower loss you
need it to be robust.
I use 2.5mm pvc covered wire on all my antennas
even the long horizontal runs and these survive the severe snow and frost and do
not snap in the gales.
You do not mention balloon size but 4 should carry
1mm wire plus lightweight marine grade anchor cord.
mal/g3kev
----- Original Message -----
Sent: Friday, December 31, 2010 11:08
AM
Subject: Re: LF: VLF - G3XIZ transmitting
today
Ok Gary,
There's 50m of balloon aerial aloft now but one of the 4
ballooons has just burst.
It must have touched the wire.
Hopefully the
others will hold out.
I think I may try heavier wire next time as 0.2
mm is very difficult to handle.
73 Chris XIZ
From: Gary - G4WGT <[email protected]>
To: [email protected]
Sent: Fri, 31 December, 2010
10:57:06
Subject: Re: LF: VLF
- G3XIZ transmitting today
Chris,
Just read the mail (1050utc) & I have adjusted my loop Rx system to
your frequency running SpecLab at QRS600, 4.5mHz.
73,
Gary - G4WGT - IO83qo.
On 31 December 2010 10:07, Chris Osborn <[email protected]> wrote:
All noted Andy.
The aerial current is about 0.15A
The
frequency is drifting slightly due to shack cooling and is now
8.971 870
kHz
I'll try the balloon aerial in about half an hour then switch to
slow QRSS.
73 Chris XIZ
From: Andy Talbot <[email protected]>
To: [email protected]
Sent: Fri, 31 December, 2010
9:43:41
Subject: Re: LF:
VLF - G3XIZ transmitting today
Thinking about that -
Its exactly what I did with my first 73khz SLOWCW Tx prog
back in 1997. SLOWCW was generated, and a part of the 'mark'
signal consisted of the callsign being sent at normal CW speeds for
identification. G3PLX could see this fast CW on his received
warerfall as a definte reduction in carrier power.
On 31 December 2010 09:39, Andy Talbot <[email protected]>
wrote:
SDR-IQ is running, with a 20Hz wide waterfall looking in 0.03Hz FFT
bin size.
It took 5 minutes for a calibration signal to show up on the
screen.
The paint is drying - slowly :-)0
If you want to send QRSS identifier at high speeds (relative) ,
suggest you repeat at 10 or 15 minute regular intervals. They
will then show up up as periodic reductions in carrier level of about 3dB
or so.
If fact, tht just may be a suitable task for a new bit of software or
a PIC - a mixed QRSSSSSS generator
Andy
On 31 December 2010 08:44, Chris Osborn <[email protected]>
wrote:
LF,
I shall be transmitting VLF today starting at 09.00
Z
Freq: 8.971 855 kHz (nominal but
close)
Mode : Continuous carrier with occasional QRSS
identifier
Aerial: Initially: 40m inverted 'L' at
10m
Later: balloon supported aerial at
50m
Hopefully the system will keep going as the loading coil
re-wind
seems to have done the trick now that the varnish has
dried.
73
Chris
G3XIZ
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