Re: [Elecraft] Output power problem

[JEAN-FRANCOIS MENARD]

I put my board under a magnifier glass, and I found was you have 
suspected T3 Why T3... because I unsoldered the wrong place 
when first removing the bad Q7... removed a leg of T3 and resoldered 
it not correctly


Ok, now I've replaced only Q7... waiting to receive Q8 I now have 
13.x VDC on the collector of Q7 and Q8 when tuning.


Voltage on Q5 did not change.

Q6 still the same when hitting TUNE

B : 1.1 VDC
C : 13.45 VDC
E :  2.1 VDC ??? should be arounf 0.4 VDC

We must consider than I have Q8 missing at his moment, only a new Q7 
is there, but should emitter of Q6 be ok ??? Change Q6 for a new one 
and it's the same values.




Le 04-06-25, à 15:31, Dan Barker a écrit :

You sure it's not PTTL on T3? There's not a whole lot of components 
between

+12 and the collectors.

As to Q5, you don't mention your supply voltage, but again, there's 
not a
whole lot of components between +12 and the collector. I'd say 13.4 
is fine.


Dan / WG4S / K2 #2456

ps: PTTL = Poorly Tinned Toroid Leads


Both Q7 & Q8

B : 0.6 VDC
C : 0.0 VDC !!! (should be around 13.3 VDC
E : 0.0 VDC

There is also the readings I have with driver Q5 when tuning at 2W

Q5

E : 0.6 VDC
B : 1.2 VDC
C : 13.4 VDC (should be 12.4, but... )

Any idea ???

===
Jean-François Ménard / VA2VYZ
[EMAIL PROTECTED]

Amateur Radio Club of Sherbrooke, Quebec, Canada

Web site: http://homepage.mac.com/jfmenard
===
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===
Jean-François Ménard / VA2VYZ
[EMAIL PROTECTED]

Club d'Astronomie Amateur de Sherbrooke
Club Radio Amateur de l'Estrie

Mon site web personnel : http://homepage.mac.com/jfmenard
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===
Jean-François Ménard / VA2VYZ
[EMAIL PROTECTED]

Club d'Astronomie Amateur de Sherbrooke
Club Radio Amateur de l'Estrie

Mon site web personnel : http://homepage.mac.com/jfmenard
===

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RE: [Elecraft] Output power problem

[Ron D'Eau Claire]

Start checking at each part back toward where you do have 13 vdc. Suddenly,
you'll have the bad connection 'bracketed' - no 13 v on one side and 13 v
present on the other side. 

 You may have a badly tinned toroid lead. They can be hard to spot at times
(the lead will look soldered,  but there's actually still a thin layer of
enamel between the wire and the solder in the hole. 

Ron AC7AC

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of JEAN-FRANCOIS MENARD
Sent: Friday, June 25, 2004 11:53 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft] Output power problem


Finally I changed PA transistors Q7 & Q8, because I shorten Q7 between 
Base and Collector by accident with my probe... no big deal...

Now, tuning at 2W I have again these readings:

Both Q7 & Q8

B : 0.6 VDC
C : 0.0 VDC !!! (should be around 13.3 VDC
E : 0.0 VDC

There is also the readings I have with driver Q5 when tuning at 2W

Q5

E : 0.6 VDC
B : 1.2 VDC
C : 13.4 VDC (should be 12.4, but... )

Any idea ???

===
Jean-François Ménard / VA2VYZ
[EMAIL PROTECTED]

A


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