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XG2 Frequency Accuracy

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David Gilbert

XG2 Frequency Accuracy

Does anyone know the typical frequency accuracy of the XG2? If I had
two XG2's, what would be the typical separation in frequency between the
two of them at the 14060 setting?

Thanks,
Dave AB7E

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Don Wilhelm-4

Re: XG2 Frequency Accuracy

Dave,

The frequency accuracy of the XG2 will vary with the individual
crystals. It is not specifically for frequency accuracy, but for level
accuracy.

In other words, I would not depend on the XG2 for any sort of frequency
calibration unless you measured the output of a particular one with a
calibrated frequency meter.

73,
Don W3FPR

On 12/11/2010 9:00 PM, David Gilbert wrote:
> Does anyone know the typical frequency accuracy of the XG2? If I had
> two XG2's, what would be the typical separation in frequency between the
> two of them at the 14060 setting?
>
>
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David Gilbert

Re: XG2 Frequency Accuracy

Yeah, I understand that. I was just wondering how close they might be
since I don't have a clue what the tolerance is of the crystals used by
Elecraft. Specifically, I was wondering if they would be close enough
(typically) to use for in-band IMD tests as a function of AGC settings.
Or at least close enough that whichever one was higher in frequency
could be easily padded down to within a few tens of Hz or so of the other.

73,
Dave AB7E

On 12/11/2010 7:22 PM, Don Wilhelm wrote:

> Dave,
>
> The frequency accuracy of the XG2 will vary with the individual
> crystals. It is not specifically for frequency accuracy, but for
> level accuracy.
>
> In other words, I would not depend on the XG2 for any sort of
> frequency calibration unless you measured the output of a particular
> one with a calibrated frequency meter.
>
> 73,
> Don W3FPR
>
> On 12/11/2010 9:00 PM, David Gilbert wrote:
>> Does anyone know the typical frequency accuracy of the XG2? If I had
>> two XG2's, what would be the typical separation in frequency between the
>> two of them at the 14060 setting?
>>
>>
>

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Don Wilhelm-4

Re: XG2 Frequency Accuracy

Dave,

I would expect the frequency to be within a couple hundred Hz of the
frequency on the crystal.
Yes, you should be able to pad the frequency down with a small parallel
capacitor, just like any VXO. I don't know how much range you would get
without adding a series inductor to the bottom side on the crystal.
Experiment with it and see what you get.

Actually, I think it would be easier to just build a VXO or two -
manhatten construction is quite easy to do, just cut some pads for the
parts of the circuit that need to be isolated from ground and glue them
to a PC Board ground plane - alternately, use high value resistors (4.7
megohms for instance) to serve as "insulators" and build it using Wes
Hayward's "Ugly Construction" techniques.

73,
Don W3FPR

On 12/12/2010 12:23 AM, David Gilbert wrote:

>
> Yeah, I understand that. I was just wondering how close they might be
> since I don't have a clue what the tolerance is of the crystals used
> by Elecraft. Specifically, I was wondering if they would be close
> enough (typically) to use for in-band IMD tests as a function of AGC
> settings. Or at least close enough that whichever one was higher in
> frequency could be easily padded down to within a few tens of Hz or so
> of the other.
>
> 73,
> Dave AB7E
>
>
>
> On 12/11/2010 7:22 PM, Don Wilhelm wrote:
>> Dave,
>>
>> The frequency accuracy of the XG2 will vary with the individual
>> crystals. It is not specifically for frequency accuracy, but for
>> level accuracy.
>>
>> In other words, I would not depend on the XG2 for any sort of
>> frequency calibration unless you measured the output of a particular
>> one with a calibrated frequency meter.
>>
>> 73,
>> Don W3FPR
>>
>> On 12/11/2010 9:00 PM, David Gilbert wrote:
>>> Does anyone know the typical frequency accuracy of the XG2? If I had
>>> two XG2's, what would be the typical separation in frequency between
>>> the
>>> two of them at the 14060 setting?
>>>
>>>
>>