## RXTX_04 Dividers

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• Given: Voltages, with respect to regular ground, are the nominal values per R13 and R14 test values, along with the voltage test points for Uo5. Set up for
Message 1 of 4 , Jan 31, 2011
Given:

Voltages, with respect to regular ground, are the nominal values per R13 and R14 test values, along with the voltage test points for Uo5.

Set up for test:

Tune Tab: Set, 7.04 mhz

Test Values:  QSE Clk 0= 21.123

QSE Clk 1= 21.123

QSD Clk 0= 21.123

QSD Clk 1= 21.123

Does anyone have any explanation why my frequencies arn't nominal 7.04 like the auther's??

Tom KJ9P
• ... Hi Tom, Are you using a freq counter? If so, they respond to harmonics. The QSD clocks are square wave which have 1st, 3rd, 5th, 7th,... harmonics. Some
Message 2 of 4 , Jan 31, 2011

Tune Tab: Set, 7.04 mhz

Test Values:  QSE Clk 0= 21.123

QSE Clk 1= 21.123

QSD Clk 0= 21.123

QSD Clk 1= 21.123

Does anyone have any explanation why my frequencies arn't nominal 7.04 like the auther's??

Hi Tom,

Are you using a freq counter?  If so, they respond to harmonics.  The QSD clocks are square wave which have 1st, 3rd, 5th, 7th,... harmonics.

Some freq counters have a LowPass button to help prevent this (sometimes depending on the rolloff).

73,  Mike Collins   KF4BQ

• Mike Thanks for the reply. I m using an MFJ HF/UHF/VHF #MFJ-369 SWR ANALYZER. I will read the instruction and see if there is a lowpass function. At least
Message 3 of 4 , Jan 31, 2011
Mike

Thanks for the reply.  I'm using an MFJ HF/UHF/VHF #MFJ-369 SWR ANALYZER.

I will "read the instruction" and see if there is a lowpass function.

At least now I will be able to continue to the next section to build.

Thanks again
Tom
----- Original Message -----
Sent: Monday, January 31, 2011 1:22 PM
Subject: Re: [softrock40] RXTX_04 Dividers

Tune Tab: Set, 7.04 mhz

Test Values:  QSE Clk 0= 21.123

QSE Clk 1= 21.123

QSD Clk 0= 21.123

QSD Clk 1= 21.123

Does anyone have any explanation why my frequencies arn't nominal 7.04 like the auther's??

Hi Tom,

Are you using a freq counter?  If so, they respond to harmonics.  The QSD clocks are square wave which have 1st, 3rd, 5th, 7th,... harmonics.

Some freq counters have a LowPass button to help prevent this (sometimes depending on the rolloff).

73,  Mike Collins   KF4BQ

No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 8.5.449 / Virus Database: 271.1.1/3414 - Release Date: 01/31/11 07:34:00
• Mike Checked the book, no help there. Did the math, yep, third harmonic. Thanks again. Tom ... From: Mike Collins To: softrock40@yahoogroups.com Sent: Monday,
Message 4 of 4 , Jan 31, 2011
Mike

Checked the book, no help there.  Did the math, yep, third harmonic.

Thanks again.

Tom
----- Original Message -----
Sent: Monday, January 31, 2011 1:22 PM
Subject: Re: [softrock40] RXTX_04 Dividers

Tune Tab: Set, 7.04 mhz

Test Values:  QSE Clk 0= 21.123

QSE Clk 1= 21.123

QSD Clk 0= 21.123

QSD Clk 1= 21.123

Does anyone have any explanation why my frequencies arn't nominal 7.04 like the auther's??

Hi Tom,

Are you using a freq counter?  If so, they respond to harmonics.  The QSD clocks are square wave which have 1st, 3rd, 5th, 7th,... harmonics.

Some freq counters have a LowPass button to help prevent this (sometimes depending on the rolloff).

73,  Mike Collins   KF4BQ

No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 8.5.449 / Virus Database: 271.1.1/3414 - Release Date: 01/31/11 07:34:00
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