The DOT and DASH inputs on the FT857 are in series with some 1K (or maybe 10 Ko, I don't remember) resistors that are on the back of the board, but are very small. These break because they immediately have a 0.1uF (or 0.001 uF ...) capacitor to ground. I put some bigger ones (also SMD). Mine broke one by one, a few months apart ...
Ady/YO8AZQ
Nu au fost ucisi copaci prin trimiterea acestui mesaj. Cu toate acestea, un num?r mare de electroni au fost deranja?i teribil!
No trees were killed in the sending of this message, however, a large number of electrons were terribly inconvenienced!
Miercuri, 26 februarie 2025 la 04:37:19 GMT+2, Dave, N9SS prin groups.io <n9ssham@...> a scris:
F?ceam rucsac portabil cu 857d-ul meu ?i cred c? antena mea ar fi fost str?ns cuplat? la cheia mea cw. Oricum, tasta cw nu mai func?ioneaz?, iar modul Keyer va trimite doar liniu?e. O s? verific continuitatea ?ntre pinii Q1049 19 ?i 20 (punct ?i liniu??) ?i mufa cheii ?asiului ?i sper c? nu am pr?jit intrarea punctului Q1049! Dac? da; Este aceasta o component? care poate fi ?nlocuit??
--
N9SS, Dave
