[Kenwood] TS-430 PLL Problem... SOLVED!

[Steve Kent]

Joe, Ed:

You guys are spot on. The PLL output was going to the rail trying to 
tune the VCO to a place that it wouldn't oscillate (due to L10 being out 
of the ballpark) which caused the PLL to unlock.

I tweaked L10 per the alignment procedure and now everything is 
tracking. She's up and running again!

Thank you for the help!

Best Regards,
Steve Kent
KW5CQ

Steve Kent wrote:
> Wow, this is great stuff, guys.  I will check this out tonight!
>
> Regards & 73,
> Steve Kent - KW5CQ
>
> ma.locksmith at juno.com wrote:
>> That provides a clue.....  it does jump up to the highest level....
>>
>> To me this says PLL/VCO is misadjusted for tuning range.
>>
>> What you want to do is measure the DC control voltage of that VCO.  It
>> should change as you change frequency.  I think it's either bottoming 
>> out
>> at the lowest voltage, or hitting the rail at the top.  See where it is
>> when the set is working.
>>
>> The answer might be just a simple adjustment of the trimmer to allow
>> operation over a different range.
>>
>> Do you have the alignment instructions for that VCO?  What dial setting
>> vs what voltage?
>>
>> You might be able to second guess it.....  the VCO control voltage
>> usually runs between 1.3 volts on the low side and 7 on the high 
>> side. If yours is running between 0.75 and 4.0 you can take the dial 
>> to where
>> the reading is 3.0 and adjust the trimmer so the voltage goes up to 6
>>
>> Ed
>>
>>
>> On Tue, 12 Feb 2008 23:17:11 -0600 Steve Kent <skent at ix.netcom.com>
>> writes:
>>  
>>> Hi Ed:
>>>
>>> Okay.  I took a look at it. If you START tuning UP form 28.999 this is
>>> what happens:
>>>
>>> 28.999 Radio TX & RX OK on indicated freq.
>>>
>>> 29.000-29.365 Radio stays on 29.365, TX & RX
>>>
>>> 29.366-29.499 Tunes Fine, TX & RX
>>>
>>> 29.500-29.865- Radio stays on 29.865, TX & RX
>>>
>>> 29.866-29.999 Tunes Fine, TX & RX
>>>
>>> This repeats for every 1Mhz segment, spanning the entire coverage of 
>>> the radio.
>>>
>>> Best Regards & 73,
>>> Steve Kent - KW5CQ
>>>
>>>
>>>     
>>
>>   
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