Hi Roelof,
thank you for sharing your SAQ reception with us.
It's a very good benchmark for comparisons and Perseus
is a great tool to make such file sharing possible.
My Miniwhip is only 30cm above the lawn and the SNR of the 0900
transmission
was about the same as at your location,signal strength 6dB less (S8).
Hint for all (potential) Miniwhip users:
Check the DC of your power supply,even if it's linear regulated.
Mine, a cheap one from Reichelt.de with a DC-DC converter for
switchable voltages
from 3V to 12V had differential mode spikes on the DC rail which
caused
a lot of noise.
And do earth the coax at or near the whip as suggested by Roelof.
These were the two noise sources I had to fight against before the
whip performed
as expected.
73
Clemens
DL4RAJ
----- Original Message -----
From: "Roelof Bakker" <[email protected]>
To: <[email protected]>
Sent: Sunday, July 04, 2010 11:50 PM
Subject: LF: SAQ
Hello all,
The 09:00 UTC transmission was received very well in the south
western
part of the Netherlands.
Easy aural copy in a 500 Hz bandwidth and the "back wave" on key up
could
be heard as well.
It is about 20 dB weaker than the signal on key down.
I have made a 0-100 kHz PERSEUS recording of the complete
transmission,
split up in 1 minute files of 42.9 MB.
These can be downloaded from my webspace:
http://www.ndb.demon.nl/SAQ/
This is not only of interest for PERSEUS owners, but also for those
who
use Alberto di Beni's excellent WinRAD.
If you don't have it, you can download version v1.33 here:
http://www.weaksignals.com/
After installing WinRad, click on ShowOptions, then Mode and select
I
(Left) / Q(Right).
Click once more on ShowOptions, then Select Input and select WAV
file...
You can now browse to the location on your hard drive where the
PERSEUS
file(s) have been stored.
Start playback by clicking on the green play back arrow.
Then select CW and set Tune to 17.200 and you are in business.
I have to click on the RBW knop to get the ruler displaying the
right
frequency.
The setting of RBW does change the frequency resolution of the
displays.
When you have heard SAQ, you can also look at other stations up to
100 kHz
as received at my QTH.
The antenna is a mini-whip, mounted 5 metre up the stem of a
magnolia tree.
Effective capture area is 30 x 40 mm.
Best regards,
Roelof
=====================================================================
From: Roelof Bakker, pa0rdt
Location: Middelburg, Zealand SW Netherlands, 51 30 02 N, 03 36 02 E
Locator: JO11tm
Receiver:
PERSEUS DIRECT SAMPLING SDR, Bandwidth 10 Hz
Aerial: pa0rdt-mini-whip, 5 metre up a magnolia tree, main antenna
======================================================================
--------------------------------------------------------------------------------
Eingehende eMail ist virenfrei.
Von AVG überprüft - www.avg.de
Version: 9.0.830 / Virendatenbank: 271.1.1/2981 - Ausgabedatum:
07/04/10 08:35:00
| 