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Re: XG50 - Frequency Instability - Resolved

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kj7rt

Re: XG50 - Frequency Instability - Resolved

First I want to thank those that pointed out that my first two postings
didn't contain message content, probably due to using HTML. You were
right, I changed the default for this email program to plain text.

Second thank you to the responders that suggested solutions to my
"instability" non-problem. Turns out it was the input level to the HP
5334A. Adjustment of the counter nailed it pretty close. Stabilized at
49.380000 MHz +-2 Hz.

73
Gary Marklund
KJ7RT
Sun City, AZ
USA

> -------- Original Message --------
> Subject: [Elecraft] XG50 - Frequency Instability
> From: <[hidden email]>
> Date: Thu, May 22, 2014 7:31 am
> To: [hidden email]
>
>
> I am trying to use my XG50 to run the Extended Temperature Compensation
> Procedure on my KX3. This is the first time I have attempted to use the
> XG50 since building it. I have completed the 8 hour burn-in.
>
> When I first connect the XG-50 to my HP frequency counter, I get a
> reading of something like 49.379990. Then after running for several
> minutes it starts dropping in frequency to something more like
> 49.32xxxx. It is still wildly fluctuating. If I connect the 10MHz output
> of my Trimble Thunderbolt GPSDO to the counter it stays quite stable
> just below 10 MHz.
>
> I re-soldered all the XG50 components and tried with both a metered
> home-brew power supply and a 12v SLA battery with the same result
> although re-soldering made a significant but not permanent improvement.
>
> My lab is in my photographic darkroom which has an ambient temperature
> of about 68 degrees F and the AC does blow across the work area.
>
>
> Thanks,
>
> Gary Marklund
> KJ7RT
> Sun City, AZ
> USA
>
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> Elecraft mailing list
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> Post: mailto:[hidden email]
>
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> Message delivered to [hidden email]

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GM4JJJ

Re: XG50 - Frequency Instability - Resolved

Great to hear Gary. You should be all set for the calibration of the KX3 now.

73

David Anderson GM4JJJ

> On 23 May 2014, at 05:53, <[hidden email]> wrote:
>
> First I want to thank those that pointed out that my first two postings
> didn't contain message content, probably due to using HTML. You were
> right, I changed the default for this email program to plain text.
>
> Second thank you to the responders that suggested solutions to my
> "instability" non-problem. Turns out it was the input level to the HP
> 5334A. Adjustment of the counter nailed it pretty close. Stabilized at
> 49.380000 MHz +-2 Hz.
>
> 73
> Gary Marklund
> KJ7RT
> Sun City, AZ
> USA
>
>> -------- Original Message --------
>> Subject: [Elecraft] XG50 - Frequency Instability
>> From: <[hidden email]>
>> Date: Thu, May 22, 2014 7:31 am
>> To: [hidden email]
>>
>>
>> I am trying to use my XG50 to run the Extended Temperature Compensation
>> Procedure on my KX3. This is the first time I have attempted to use the
>> XG50 since building it. I have completed the 8 hour burn-in.
>>
>> When I first connect the XG-50 to my HP frequency counter, I get a
>> reading of something like 49.379990. Then after running for several
>> minutes it starts dropping in frequency to something more like
>> 49.32xxxx. It is still wildly fluctuating. If I connect the 10MHz output
>> of my Trimble Thunderbolt GPSDO to the counter it stays quite stable
>> just below 10 MHz.
>>
>> I re-soldered all the XG50 components and tried with both a metered
>> home-brew power supply and a 12v SLA battery with the same result
>> although re-soldering made a significant but not permanent improvement.
>>
>> My lab is in my photographic darkroom which has an ambient temperature
>> of about 68 degrees F and the AC does blow across the work area.
>>
>>
>> Thanks,
>>
>> Gary Marklund
>> KJ7RT
>> Sun City, AZ
>> USA
>>
>> ______________________________________________________________
>> 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]
> ______________________________________________________________
> 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]

Phil Wheeler-2

Re: XG50 - Frequency Instability - Resolved

In reply to this post by kj7rt

Thanks for posting that, Gary. As a user of the
XG50 it's reassuring that you have resolved this
issue.

Phil w7ox

On 5/22/14, 9:53 PM, [hidden email] wrote:

> First I want to thank those that pointed out that my first two postings
> didn't contain message content, probably due to using HTML. You were
> right, I changed the default for this email program to plain text.
>
> Second thank you to the responders that suggested solutions to my
> "instability" non-problem. Turns out it was the input level to the HP
> 5334A. Adjustment of the counter nailed it pretty close. Stabilized at
> 49.380000 MHz +-2 Hz.
>
> 73
> Gary Marklund
> KJ7RT
> Sun City, AZ
> USA
>
>> -------- Original Message --------
>> Subject: [Elecraft] XG50 - Frequency Instability
>> From: <[hidden email]>
>> Date: Thu, May 22, 2014 7:31 am
>> To: [hidden email]
>>
>>
>> I am trying to use my XG50 to run the Extended Temperature Compensation
>> Procedure on my KX3. This is the first time I have attempted to use the
>> XG50 since building it. I have completed the 8 hour burn-in.
>>
>> When I first connect the XG-50 to my HP frequency counter, I get a
>> reading of something like 49.379990. Then after running for several
>> minutes it starts dropping in frequency to something more like
>> 49.32xxxx. It is still wildly fluctuating. If I connect the 10MHz output
>> of my Trimble Thunderbolt GPSDO to the counter it stays quite stable
>> just below 10 MHz.
>>
>> I re-soldered all the XG50 components and tried with both a metered
>> home-brew power supply and a 12v SLA battery with the same result
>> although re-soldering made a significant but not permanent improvement.
>>
>> My lab is in my photographic darkroom which has an ambient temperature
>> of about 68 degrees F and the AC does blow across the work area.
>>
>>
>> Thanks,
>>
>> Gary Marklund
>> KJ7RT
>> Sun City, AZ
>> USA