FW: Output power problem

[Dan Barker]

You sure it's not PTTL on T3? There's not a whole lot of components between
+12 and the collectors<g>.

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

<snip>
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
[hidden email]

Amateur Radio Club of Sherbrooke, Quebec, Canada

Web site: http://homepage.mac.com/jfmenard
===============================================
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[JEAN-FRANCOIS MENARD-2]

> 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<g>.
>>
>> 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
>>
>> <snip>
>> 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
>> [hidden email]
>>
>> Amateur Radio Club of Sherbrooke, Quebec, Canada
>>
>> Web site: http://homepage.mac.com/jfmenard
>> ===============================================
>> _______________________________________________
>> Elecraft mailing list
>> Post to: [hidden email]
>> You must be a subscriber to post to the list.
>> Subscriber Info (Addr. Change, sub, unsub etc.):
>> http://mailman.qth.net/mailman/listinfo/elecraft    Help:
>> http://mailman.qth.net/subscribers.htm
>> Elecraft web page: http://www.elecraft.com
>>
>> _______________________________________________
>> Elecraft mailing list
>> Post to: [hidden email]
>> You must be a subscriber to post to the list.
>> Subscriber Info (Addr. Change, sub, unsub etc.):
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>> http://mailman.qth.net/subscribers.htm
>> Elecraft web page: http://www.elecraft.com
> ===============================================
> Jean-François Ménard / VA2VYZ
> [hidden email]
>
> Club d'Astronomie Amateur de Sherbrooke
> Club Radio Amateur de l'Estrie
>
> Mon site web personnel : http://homepage.mac.com/jfmenard
> ===============================================
>
>

===============================================
Jean-François Ménard / VA2VYZ
[hidden email]

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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