Hello Lorenz and others,
I have got the same problem on 80m with my recently assembled K1, sn#2919.
The PA current was over 4amps for 5 watts RF output.
I also burned the PA final Q7.
After investigation, it turned out that wrong toroid was supplied for T4
with the kit.
After replacing the toroid by a correct FT50-43 and a new PA 2SC1969 FOR Q7
the set was
working perfect also on 80m.
I will advise al owners of recently assembled K1 sets to check the type of
the T4 toroid.
With the wrong type the set is working on the higher bands, output is
normal, but the PA
current is higher than it should be as the efficiency of the PA is too low.
The wrong toroid is complete black with a diameter of 11mm. The FT50-43 is
black with one
side dark grey and the diameter is 12,7mm.
I know already from two other sets with the same problem. So there will be
more around
I suppose. At Elecraft they are aware of this.
Hope this will help you and maybe others out of the problems.
73, Guido, ON6RL.
-----Oorspronkelijk bericht-----
Van:
[hidden email]
[mailto:
[hidden email]] Namens Lorenz Koestler
Verzonden: zondag 17 oktober 2010 22:39
Aan:
[hidden email]
Onderwerp: [Elecraft] K1 no output power
Hi
I build a K1 (80m, 20m) during the last days and had a lot of fun! The
manual is just awesome and I am looking forward to make my first qso
with it.
Now I have a problem with the tramitter. That is why I joined this list
and I was very glad to see, that there is much activity.
The rx alignment went well and the resistance and voltage checks of the
tx part are all fine.
When I first started the tune mode on 80m with 2 watts, it shows me
somewhat like 1.7, Q7 became quite hot and something started smelling. I
was not able to read the current consumption before I disconnected the
source.
After double-checking all resistor values, the orientation of all diodes
and ICs and the transformers, I tried it again.
But now, regardless on what Out-Pwr and Band I choose, the display shows
"P0.1" in tune mode. I can hear a very weak tone in the K3 standing next
to the K1. The current consumption is at about: 60mA rx, 200mA tx
I cant see any cold solder connections nor bridges.
So I guess I burned Q7 somehow. Any idea what I can do or what went
wrong here?
How can I test a 2SC1969 and what do I have to check, to make sure, I
don't just burn a new one?
Many tnx fer ur help and best 73 de Lorenz / HB9TYU (Zurich, Switzerland)
--
Lorenz Koestler <
[hidden email]> / HB9TYU
PingMe:
https://pingen.com/*lorenz______________________________________________________________
Elecraft mailing list
Home:
http://mailman.qth.net/mailman/listinfo/elecraftHelp:
http://mailman.qth.net/mmfaq.htmPost: mailto:
[hidden email]
This list hosted by:
http://www.qsl.netPlease help support this email list:
http://www.qsl.net/donate.html______________________________________________________________
Elecraft mailing list
Home:
http://mailman.qth.net/mailman/listinfo/elecraftHelp:
http://mailman.qth.net/mmfaq.htmPost: mailto:
[hidden email]
This list hosted by:
http://www.qsl.netPlease help support this email list:
http://www.qsl.net/donate.html
Locked
