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Re: LF: QRV on 500

To: <[email protected]>
Subject: Re: LF: QRV on 500
From: "Graham" <[email protected]>
Date: Wed, 27 Aug 2008 19:08:37 +0100
Importance: Normal
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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


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