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Re: LF: Re: MiniWhip antenna, fiber optic TEST SIGNALS NEEDED on 630m WS

from [Stefan Schäfer] [Permanent Link][Original]
To: [email protected]
Subject: Re: LF: Re: MiniWhip antenna, fiber optic TEST SIGNALS NEEDED on 630m WSPR
From: Stefan Schäfer <[email protected]>
Date: Sun, 14 Jul 2013 00:33:02 +0200
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Hello Jan,
The tuning of the whip was done in my office by using a noise generator and a spectrum scope. The noise was injected by another small short dipole. After adjusting to the peak i reduced the coupling of the 2nd dipole and checked if this made an effect to the resonance frequency (didn't). During the RX experiment on the roof, the transmit antenna was detuned (floating). I did not check the effect to the signal levels when the antenna is tuned to MF. Maybe next time. 

73, Stefan/DK7FC

Am 13.07.2013 14:56, schrieb pa3abk:

On 13-7-2013 14:28, Stefan Schäfer wrote:

....
Due to the lower signal levels of the short active dipole i now resonated the antenna to 630m, where i plan to do my tests. This prevents IM and causes a significant gain! 
.....
Assume the whip itself is tuned and not the longwire TX antenna next to it :-)
Do you see a difference in signal when you ground your TX antenna versus fully tuned on MF? 
In other words does the TX antenna has any coupling to the MW.

Jan/pa3abk
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