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

[Stefan Schäfer <Stefan.Schaefer@iup.uni-heidelberg.de>]

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