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R2400 Freq. Error

This forum exists for the purposes for discussing service monitors (This includes but is not limited to Motorola, HP, Aeroflex, GD, etc). Additional topics allowed include test procedures, interpretation of test results, where to find information about specific tests, antenna VSWR, return loss testing, duplexer and filter alignment, etc.

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leaper54
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Joined: Thu Jul 31, 2014 5:35 am

R2400 Freq. Error

Postby leaper54 » Sat Apr 01, 2017 7:34 am

My R2400 works great, except for frequency error. It seems to always read about +.800 KHz, and the bar graph is not steady.
The error fluctuates between +500 and +800. My frequency counter shows correct, stable frequency. Is this an alignment issue?
I got this from a Silent Key Ham, and it is quite new to me.

DJP126
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Joined: Wed Jun 18, 2003 6:41 am
What radios do you own?: What's a radio?

Re: R2400 Freq. Error

Postby DJP126 » Sun Apr 02, 2017 10:31 pm

Is that .800 KHz error across the entire spectrum or does the error change by frequency band (Low band, high band, UHF, 800 MHz)? If it changes by band, the master oscillator could be off slightly. As for the fluctuations, you might be overdriving the receiver. Try adding some attenuation.
Dave

leaper54
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Re: R2400 Freq. Error

Postby leaper54 » Tue Apr 04, 2017 6:18 am

Thanks for the reply. The error seems to increase with frequency. I see the TCXO reference module, but do not see an adjustment.
Is it behind the screw near the speaker?

Audiotron
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Re: R2400 Freq. Error

Postby Audiotron » Thu Apr 06, 2017 7:10 am

Hi friend

Typically when we have a problem in the TCXO when the frequency goes up the error is usually higher

good repair , Hugs

DJP126
Posts: 862
Joined: Wed Jun 18, 2003 6:41 am
What radios do you own?: What's a radio?

Re: R2400 Freq. Error

Postby DJP126 » Thu Apr 06, 2017 2:29 pm

Yes it is. That "screw" is a dust cover so don't lose it.
Dave

Audiotron
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Re: R2400 Freq. Error

Postby Audiotron » Fri Apr 07, 2017 6:40 am

Typically for both TCXO or OCXO when out of frequency, at higher frequencies the value doubling error


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