Skip to main content

Posts

Showing posts from May 4, 2020

FT225RD, FT902 repair

Old rigs of s.k. Eltje PA3CEE  here for check and repair
The rig's looked like they have been working in a brown cafe for years
He was a real smoker ...




The  100pf 1000V mica capacitor was shorted and caused the 6146 damage one tube glas was busted
I replaced both tubes ... warning be very careful not to touch the anode part  almost 1000V stays long time loaded in the HV high capacity capacitors, no bleeder R it seems.
Before doing any work make sure the anode C is unloaded I used  a 10k resistor against ground with an isolated gripper and grounded wire!



----------------- the other rig 144 - 146 MHz all mode --------------------------------



The original  front end was replaced by a Mutek front as that was often done 30 year ago.
However my  FT221R  the preceding   have the original front-end ,i can't find this one less performing.  And the FT221 can handle the extreme strong local contest station PA1T . That is about the strongest signal on the band.
It is not like in the glo…