[Fox_Tango] FT101ZD mk3 Some minor problems

[André pe1hwo]

Recently I acquired a SP901 speaker, since then i notice I low hum from the
audio amp, also a oscilating high tone which seems to come from the dimmer
circuit (when set to bright). I didn't hear the hum and high tone from
build-in speaker.

When using the rig with a transverter i have troubles with RFI  as feedback
on the speech processor at high power levels on 144MHz.

Further more i find the APF filter working well but not very stable. When i
notch or peak the (stable) marker signal, you can hear the notch or peak
drifting with in a minute.

Has anyone some hints to keep my golden oldie up and running?

Many thanks,

73 André pe1hwo@amsat.org  www.qsl.net/pe1hwo