KX1 - Q4, Q5 resistance check

[Johnny Siu]

Hello KX1 builders,
The construction of KX1 runs all ok up to page 54.  However, the resistance check for Q4 base and collector, Q5 base only give 5.6k resistance towards ground instead of >10k as mentioned in the manual.
Please advise whether this is still ok.  I would like to make sure that before going to alignment & test - part III.
73
Johnny VR2XMC
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[Don Wilhelm-4]

Johnny,

That is too low.  Check the value of R24, R9, R27, R11 and R10. Check
carefully for any solder bridges.
You might also want to try new batteries in your DMM and try reversing
the leads on your DMM just in case its polarity is reversed from normal.

73,
Don W3FPR

On 11/30/2014 9:11 AM, Johnny Siu wrote:
> Hello KX1 builders,
> The construction of KX1 runs all ok up to page 54.  However, the resistance check for Q4 base and collector, Q5 base only give 5.6k resistance towards ground instead of >10k as mentioned in the manual.
> Please advise whether this is still ok.  I would like to make sure that before going to alignment & test - part III.
> 73
> Johnny VR2XMC
>

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[Johnny Siu]

Hello Don,
Thanks.  I was given an application note Rev B, April 2006.  The R11 and R30 were replaced by 4.7 ohm and 33 ohm respectively.
I followed this note and replaced these two resistors instead of the values mentioned in KX1 Owner's Manual May 2010.
Is this matter the resistance check?
73
Johnny VR2XMC
       寄件人︰ Don Wilhelm <[hidden email]>
 收件人︰ Johnny Siu <[hidden email]>; Elecraft <[hidden email]>
 傳送日期︰ 2014年11月30日 (週日) 10:24 PM
 主題︰ Re: [Elecraft] KX1 - Q4, Q5 resistance check
   
Johnny,

That is too low.  Check the value of R24, R9, R27, R11 and R10. Check
carefully for any solder bridges.
You might also want to try new batteries in your DMM and try reversing
the leads on your DMM just in case its polarity is reversed from normal.

73,
Don W3FPR



On 11/30/2014 9:11 AM, Johnny Siu wrote:
> Hello KX1 builders,
> The construction of KX1 runs all ok up to page 54.  However, the resistance check for Q4 base and collector, Q5 base only give 5.6k resistance towards ground instead of >10k as mentioned in the manual.
> Please advise whether this is still ok.  I would like to make sure that before going to alignment & test - part III.
> 73
> Johnny VR2XMC
>



 
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[Don Wilhelm-4]

Johnny,

Those changes would not make a significant difference in the readings
except for the Q6 base to ground measurement.

73,
Don W3FPR

On 11/30/2014 10:26 AM, Johnny Siu wrote:

> Hello Don,
> Thanks.  I was given an application note Rev B, April 2006.  The R11 and R30 were replaced by 4.7 ohm and 33 ohm respectively.
> I followed this note and replaced these two resistors instead of the values mentioned in KX1 Owner's Manual May 2010.
> Is this matter the resistance check?
> 73
> Johnny VR2XMC
>         寄件人︰ Don Wilhelm <[hidden email]>
>   收件人︰ Johnny Siu <[hidden email]>; Elecraft <[hidden email]>
>   傳送日期︰ 2014年11月30日 (週日) 10:24 PM
>   主題︰ Re: [Elecraft] KX1 - Q4, Q5 resistance check
>    
> Johnny,
>
> That is too low.  Check the value of R24, R9, R27, R11 and R10. Check
> carefully for any solder bridges.
> You might also want to try new batteries in your DMM and try reversing
> the leads on your DMM just in case its polarity is reversed from normal.
>
> 73,
> Don W3FPR
>
>
>
> On 11/30/2014 9:11 AM, Johnny Siu wrote:
>> Hello KX1 builders,
>> The construction of KX1 runs all ok up to page 54.  However, the resistance check for Q4 base and collector, Q5 base only give 5.6k resistance towards ground instead of >10k as mentioned in the manual.
>> Please advise whether this is still ok.  I would like to make sure that before going to alignment & test - part III.
>> 73
>> Johnny VR2XMC
>>
>
>
>    
> ______________________________________________________________
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>
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> Please help support this email list: http://www.qsl.net/donate.html
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[Johnny Siu]

Hello Don,
Thanks, I discovered something interesting and making me laugh.
I switched the DMM from the 20k to 200k range and got the right resistance >10k.  The KX1 now delivers 4 W at 20m and 3 W at 40m according to my LP100A.  My next step is the construction of the KXB3080 module.
Thanks for your help.
73
Johnny VR2XMC
       寄件人︰ Don Wilhelm <[hidden email]>
 收件人︰ Johnny Siu <[hidden email]>; "[hidden email]" <[hidden email]>; Elecraft <[hidden email]>
 傳送日期︰ 2014年12月1日 (週一) 2:28 AM
 主題︰ Re: [Elecraft] KX1 - Q4, Q5 resistance check
   
Johnny,

Those changes would not make a significant difference in the readings
except for the Q6 base to ground measurement.

73,
Don W3FPR

On 11/30/2014 10:26 AM, Johnny Siu wrote:

> Hello Don,
> Thanks.  I was given an application note Rev B, April 2006.  The R11 and R30 were replaced by 4.7 ohm and 33 ohm respectively.
> I followed this note and replaced these two resistors instead of the values mentioned in KX1 Owner's Manual May 2010.
> Is this matter the resistance check?
> 73
> Johnny VR2XMC
>        寄件人︰ Don Wilhelm <[hidden email]>
>  收件人︰ Johnny Siu <[hidden email]>; Elecraft <[hidden email]>
>  傳送日期︰ 2014年11月30日 (週日) 10:24 PM
>  主題︰ Re: [Elecraft] KX1 - Q4, Q5 resistance check
>   
> Johnny,
>
> That is too low.  Check the value of R24, R9, R27, R11 and R10. Check
> carefully for any solder bridges.
> You might also want to try new batteries in your DMM and try reversing
> the leads on your DMM just in case its polarity is reversed from normal.
>
> 73,
> Don W3FPR
>
>
>
> On 11/30/2014 9:11 AM, Johnny Siu wrote:
>> Hello KX1 builders,
>> The construction of KX1 runs all ok up to page 54.  However, the resistance check for Q4 base and collector, Q5 base only give 5.6k resistance towards ground instead of >10k as mentioned in the manual.
>> Please advise whether this is still ok.  I would like to make sure that before going to alignment & test - part III.
>> 73
>> Johnny VR2XMC
>>
>
>
>   
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

 
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