Hi Al,
many thanks for your email,i have looked at the things you suggested
but unfortunatly that has not solved it.the drive level pot was ok,the tabs
on the pa transistors
looked ok,but i resoldered them anyway.Not checked the "T" and 12v lines yet
will do that
tomorrow now as it's 0130am !But i think they are ok.Unfortunatly although i
have made
a lot of my own gear in the past i was never the best person when it came to
repairing things
although stuff i made myself was easy enough to fix as i had put it together
and knew where
everything was.The century 22 is a bit more sofisticated than my homebrew
gear !
The problem has got worse,it now drops out as soon as you key it or
press
the lock button.
But i don't think it is a power supply problem,the supply is well regulated
and provides 15amp.
I use it with my 144mhz rig at 25watt with no problems.
Thanks anyway Al,i will have to persivere and no doubt i will fix it in
the
end,maybe some one out
there has had the same problem and will see one of my pleas for help !The
problem here is that not a great many
hams use the Ten Tec c22.
cheers for now,will let you know if i sort it.....
-----Original Message-----
From: Al Scanandoah [mailto:k2zn@rochester.rr.com]
Sent: 16 November 2000 15:27
To: bill stevenson
Subject: Re: [TenTec] Century 22 fault stil not solved
Bill
Just got back into the country, so I'd gotten behind with the e-mail.
My C22 recently had erratic power output, it turned out to be a REALLY
dirty drive control pot. After two applications of DeOxit, life was
good
again.
Another thing to look at is the solder connections on the tabs of the PA
transistors.
They may look OK, but upon close inspection, you may find that the
connections are cold.
I found this purely by accident when I had the covers off and noticed a
faint smell of ozone.
Also, put a voltmeter on the "T" and +12V lines on the PA assembly -
make sure that the voltages
don't drop down substantially when you key the transmitter. Also check
for 5.6 volts on the bias
supply zener diode (D6).
It sounds like you've got a situation where you're not getting enough
power to the PA to achieve
full power out.
Cheers - Al, K2ZN
bill stevenson wrote:
>
> Hi All,
> i have still not managed to solve the problem with my century22.
> I have tried all the easy suggestions given such as bad connections, bad
swr
> etc but it is still showing this fault as described below.
>
> > Hi All ,
> > i am new to the list and wonder if any one can help with a fault
> that has
> > just developed on my Century 22.
> > When i push the lock button to give a carrier to tune my atu etc,after
> only
> > a couple of seconds it drops out and then pulses slowly as if it were
> being
> > keyed.If i turn the drive down so there is only a couple of watts coming
> out
> > then it seems ok.If i turn it up to give anything over that it starts
> > again.Any ideas most welcome,perhaps you have experienced this and know
> > whats wrong and how to cure it ?
> > Many thanks and i look forward to hearing from you.
> >
>
> Just wondered if any one else has any ideas or has come across
this
> fault before if you missed my earlier plea for help.
> I have the circuit dia and operating manual,but not a service
manual,and my
> friends
> over here in England have told me that Ten Tec did not produce a service
> manual for this rig.
>
> Thanks for reading this and regards to all,i like this list
interesting to
> read about all your
> Ten Tec gear
Regards
Bill G4KKI
Member of RSARS,FISTS,RIG.
Website http:\\www.g4kki.freeserve.co.uk
--
FAQ on WWW: http://www.contesting.com/FAQ/tentec
Submissions: tentec@contesting.com
Administrative requests: tentec-REQUEST@contesting.com
Problems: owner-tentec@contesting.com
|