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Q1049 replacement
I was running backpack portable with my 857d and I think my antenna may have been too closely coupled to my cw key. ?Anyway, the cw key no longer works, and the Keyer mode will only send dashes. ?I am going to check for continuity between Q1049 pins 19 and 20 (dot and dash) and the chassis key jack, and I’m hoping that I didn’t fry the Q1049 dot input! If so; Is this a component that can be replaced?
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N9SS, Dave |
开云体育That’s only one S unit down from 100W!
73 de Mike, KO4WX?
Michael Boatright, M. Photog., CPP, GSD
Michael Boatright Photography
404.488.6644 Portraiture & Documentary Photography Historic Wet Collodion Process Goat Farm Arts Center 1200 Foster St., NW, Suite S301 ATLANTA, GEORGIA 30318
FB:? IG:? Certified Professional Photographer (PPA) From: [email protected] <[email protected]> on behalf of Dave, N9SS via groups.io <n9ssham@...>
Sent: Wednesday, February 26, 2025 11:23:21 AM To: [email protected] <[email protected]> Subject: Re: [FT-857] Q1049 replacement ?
I wouldn’t think the 25 watts out in battery mode would be much to worry about on 40m through 10 meters, no one else in the park would go near me during my live reports of the solar eclipse!
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N9SS, Dave
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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 |
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