Nice to see you have the Good and the Bad ,
That just leaves us with the 'Ugly' .... !
You using the main ae for rx ? perhaps a small loop would be better ?
G ..
--------------------------------------------------
From: "Rik Strobbe" <[email protected]>
Sent: Wednesday, August 27, 2008 8:47 AM
To: <[email protected]>
Subject: LF: QRV on 500
Dear all,
last night I did some first test on 500kHz after my "summer recess".
Good:
I found out that my digging over the past months had some success, the
antenna current is up with 10% (now 2.2A).
Based on antenna simulation (with MMANA-GAL) the theoretical EIRP should
be 4.7 Watt, close to my 5 W EIRP limit. But I guess that in reality it
will be some dB less due to absorption in the surrounding greenery. I will
have to do some ERP measurements to check how much is lost.
At 20.30 UT I could see my signal on various grabbers, up to the
Shetlands.
Bad:
I found out that some bad "machine gun type" interference has shown up.
The noise blanker of the TS440 can bring it down a bit, but it still
compromises any weak signal reception. I can null it out with a loop, but
unfortunately it is the same direction as southern UK. So using a loop RX
antenna is not a good solution.
If I cannot track down (and shut down) the source of interference I will
have to cancel it out some way.
An additional noise blanker?
Or picking up the interference signal with a local "sense antenna" and use
that to phase it out (combine it with the right phase and amplitude with
the signal from the main antenna)?
All suggestions are welcome.
73, Rik ON7YD
Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm
No virus found in this incoming message.
Checked by AVG - http://www.avg.com Version: 8.0.138 / Virus Database:
270.6.9/1637 - Release Date: 8/27/2008 07:01
|
