[TenTec] Paragon Reference Oscillator

[Bob, WB2VUF]

I agree. Leave the reference oscillator exactly at 84 MHz and align the 
BFO crystals instead.  They are the most likely to be off frequency.  
Yes, they must be adjusted in sequence as indicated in the manual.

73,

Bob WB2VUF

On 10/24/2020 11:23 AM, Bob McGraw K4TAX wrote:
> The first thing to check is the oscillators on the Transmit Audio/BFO 
> Board.  The procedure is on page 6-65 of the manual. From experience, 
> the adjustments are somewhat interactive and must be done in the order 
> as listed.  You should go through the procedure at least twice.  Be 
> sure the radio has been on for 1 hr to allow the temperature to 
> stabilize as the crystals are subject to drift with temperature.
>
> As to the 42 MHz crystal, it may have aged to the point that it will 
> not be in the range needed.    Replacement is the most likely option.
>
> 73
>
> Bob, K4TAX
>
> On 10/24/2020 2:54 AM, Peter Ferrand wrote:
>> I have a new-to-me Paragon 585.
>>
>> The rig is slightly off frequency from its readout and the best I can 
>> do is adjust the reference oscillator with C1 to 300 Hz lower in 
>> frequency than the 84 MHz it's supposed to be. Ten-Tec specifies this 
>> frequency must be plus or minus 5 Hz at 84 MHz, which is the output 
>> of the frequency doubler.
>>
>> I tried removing or reducing C2 but the oscillator stops oscillating. 
>> Rather than track down a new 42 MHz crystal, I wonder if anyone with 
>> more design skills than I have can suggest a slight redesign of the 
>> circuit to pull the existing crystal higher.
>>
>> Thanks.
>> Pete
>> WB2QLL
>> Mount Pleasant, WI
>>
>>
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