You are seeing the noise floor of the spectrum analyzer Either increase the generator strength or decrease the REF level, (Try -40dBm)
On Wed, May 19, 2010 at 3:49 PM, Larry Horlick <llhorl...@gmail.com> wrote: > > > -62 does seem a tad high. Describe the duplexer... > > > On Wed, May 19, 2010 at 6:29 PM, Atlantis <atlant...@gmx.ch> 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 >> > > > > >
