Hi, It looks like the filter over couple,under couple between each other. If the case caused by the interlink coaxial cable . Please try difference cable length . e.g + or - 0.5 cm in step... etc And then return the filters .
Good luck & 73s de VR2XVD On Thu, May 20, 2010 at 6:57 AM, Curt Seaton <[email protected]> wrote: > > > Narrow the resolution bandwidth and slow the sweep to remain within the > units calibration requirements. Seems you are simply seeing the noise of > the spectrum analyzer or network analyzer being many dBs below the reference > line. If the unit can tolerate it, increase the RF input level to keep the > notch out of the noise floor of the instrument. I hope you understand > this.. > > regards > > Curt W1FSM > > Atlantis wrote: > > Hi > > In the attached picture you see the notch of the 70cm duplexer I built > according to W4NFR's description in QEX, those who can't receive attachments > find it here: > > http://conturafm.mine.nu/_fh/438.95_notch.bmp > > The measurement has been made with both cavities of one branch connected > with a true quarter wavelength jumper of RG58 because I had no > double-shielded cable available. > > Can anybody tell me why the notch is this blurred and what can be done > about it? The isolation would be a bit better if the notch was a clear sharp > line, isn't it? > > Regards > Martin > > > -- HKARA website : http://www.hkara.org.hk VR2XVD email : [email protected],[email protected] Please consider the environment before printing the email.
