[Elecraft] K2 Alignment and Test, Part II - No signal on TP3

[Don Wilhelm]

Ok, initial data has been satisfied, and it has been determined that you 
have a problem.
1817 kHz does not relate to 12.096 kHz in any harmonic combination that 
I can find, so I conclude that your counter probe is measuring noise at TP1.

Recheck the soldering at all points for the PLL Reference - the 
components are indicated on the schematic sheet 1 of 4 at the back of 
the manual.



On 7/5/2012 1:53 PM, Cameron Haines wrote:
> Don,
>
> Probe is good and was at 4913 plus a few hz via TP2. Crystal in X1is the 12096 crystal. I checked continuity and double checked solder joints all looks good. I still get the strange reading as before via TP2 however.
>
> Cameron
>
>
> ________________________________
>   From: Don Wilhelm <w3fpr at embarqmail.com>
> To: Cameron Haines <camhaines at yahoo.com>
> Cc: "elecraft at mailman.qth.net" <elecraft at mailman.qth.net>
> Sent: Thursday, July 5, 2012 12:20 PM
> Subject: Re: [Elecraft] K2  Alignment and Test, Part II - No signal on TP3
>   
> Cameron,
>
> The first thing is to determine whether you have a problem with the
> counter probe or with the PLL reference oscillator.  Plug the probe into
> TP2 and expect a reading close to 4913 to 4916 kHz.  If that is true,
> the the probe is OK.
>
> If the probe is good, then check the PLL crystal.  It should be a 12,096
> mHz crystal.
> I do not know why it would oscillate at 1817 kHz, that has no
> relationship to the proper frequency.
>
> 73,
> Don W3FPR
>
> On 7/5/2012 12:47 PM, Cameron Haines wrote:
>> Good morning,
>>
>> I finally have my probe setup. Here is my readings which seem way off.
>>
>> 4 Mhz Oscillator Calibration = 1817.00 which should be reading 12090 +/- 30 kHz per manual
>>
>> PLL Reference Range Test
>>
>> Seems correct range but frequency is wrong as with Osc calibration.
>>
>> VCO Test
>>    
>> 3 - 4 kHz as opposed to 8 - 10 Mhz.
>>
>> Any thoughts were I have gone wrong?
>>
>> Thanks,
>> Cameron
>> AE5UZ
>>
>>
>> ________________________________
>>     From: Cameron Haines <camhaines at yahoo.com>
>> To: David Moorman <dmoorman4 at comcast.net>
>> Cc: "elecraft at mailman.qth.net" <elecraft at mailman.qth.net>
>> Sent: Tuesday, July 3, 2012 7:40 PM
>> Subject: Re: [Elecraft] K2  Alignment and Test, Part II - No signal on TP3
>>    
>>
>> Great suggestion. I can hear it a 4Mhz now.. from my Softrock SDR. Wonder why the Freq counters couldn't pick it up however. hmm.
>>
>> Thanks David!
>>
>>
>> ________________________________
>>     From: David Moorman <dmoorman4 at comcast.net>
>> To: Cameron Haines <camhaines at yahoo.com>
>> Cc: "elecraft at mailman.qth.net" <elecraft at mailman.qth.net>
>> Sent: Tuesday, July 3, 2012 7:03 PM
>> Subject: Re: [Elecraft] K2  Alignment and Test, Part II - No signal on TP3
>>    
>> Do you have a receiver you can listen on to see if the oscillator is actually oscillating?
>>
>> Dave K9SW
>>
>>
>>
>> On Jul 3, 2012, at 6:41 PM, Cameron Haines <camhaines at yahoo.com> wrote:
>>
>>> Correction.
>>>
>>>
>>> Hey Guys,
>>>
>>> Well, I am at the part where I need to test the 4 MHz oscillator calibration and ran into a snag. I am not getting anything on two different frequency counters when connected to TP3. Test up to this point have been good. Checked all the components around X1 and all look correct. No error message on startup.
>>>
>>> Any ideas where to go from here?
>>>
>>> Thanks,
>>> Cameron
>>> AE5UZ
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