Users may not create topics, posts, or private messages containing or relating to the following material (especially pertaining to Motorola copyrighted software, unless you want Motorola to come along and shut this site down):

  • Listing for sale or trade of, or links to sites offering for sale or trade of, or giving away, Radio
    Service Software (RSS) or Customer Programming Software (CPS)
  • Profanity, pornography, defamation, or slanderous remarks directed towards any individual or entity
  • Commercial advertising (except in the Batboard Vendors forum, as approved by the Admin/Mod Staff)
  • Any other items which may be deemed as offensive

If any topics, posts, or private messages containing or relating to the aforementioned material are brought to the attention of the Admin/Mod Staff, they will be deleted.

Additional FAQ items appear here in Forum Rules. Please review them for posting guidelines and further clarification.

R2001D/2008D/2009D etc, Power Meter Calibration

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.

Moderator: Queue Moderator

sreaves
Posts: 28
Joined: Sun Aug 04, 2013 2:15 pm

R2001D/2008D/2009D etc, Power Meter Calibration

Postby sreaves » Fri Nov 03, 2017 5:16 pm

Hello,

Does anyone have a calibration procedure for the R2001/8/9D internal terminated power meter? I am looking for adjustments for R7 and R23 Level and Offset.

Thank you,

Sam

jry
Posts: 320
Joined: Fri Feb 06, 2004 3:14 pm

Re: R2001D/2008D/2009D etc, Power Meter Calibration

Postby jry » Sun Nov 05, 2017 11:02 am

repeater builder has the D service manual with the alignment

sreaves
Posts: 28
Joined: Sun Aug 04, 2013 2:15 pm

Re: R2001D/2008D/2009D etc, Power Meter Calibration

Postby sreaves » Sun Nov 05, 2017 11:30 am

Jrv,

Well I looked at that previously and there is no mention of a calibration procedure for A17 the wattmeter board in that manual. There are two pots R7
Gain and R23 Offset. The question is how to set them. I thought that there might be someone on the board that has done this calibration before. Does anyone have any comments on how accurate this unit really is at levels below 10 watts?

Thanks,

Sam

User avatar
kcbooboo
Batboard $upporter
Posts: 2087
Joined: Wed May 01, 2002 9:03 am

Re: R2001D/2008D/2009D etc, Power Meter Calibration

Postby kcbooboo » Wed Nov 08, 2017 5:05 am

On the A/B/C units, the dummy load, and hence the RF sampling circuit, are all inside the RF input module (A11) where the step attenuator resides. As this is a very well shielded and sealed module, it's not something that can be readily adjusted in the field. The mfgr had test jigs for such assemblies as well as proprietary (i.e. non-published) procedures. It's likely going to be quite difficult to open the RF module, supply the various signals, and make any adjustments. Whatever you adjust is likely to change when you button it back up.

There are a LOT of adjustable components inside these units that are undocumented and never discussed in any alignment section. For example, neither power supply is mentioned in the A/B/C alignments but they both are in the R2001D manual.

Many of the op-amps in the R2001 have both offset and gain/level adjustments. Typically with zero input, the offset is adjusted for zero output, and with a known input, the gain is adjusted for the desired indication.

Bob M.

jry
Posts: 320
Joined: Fri Feb 06, 2004 3:14 pm

Re: R2001D/2008D/2009D etc, Power Meter Calibration

Postby jry » Wed Nov 08, 2017 6:20 am

the calibration for the wattmeter on the D series is in the later version of the service manual.
The one on the Repeater Builders site is an earlier version that is also missing the option boards as well as well as some of the adjustment procedures.

The service manuals on a lot of service monitors can be very version specific and incomplete at the best of times. Not to mention mistakes in the alignment/calibration and other areas of the manuals.


Return to “Test Equipment & RF Equipment Alignment”

Who is online

Users browsing this forum: No registered users and 1 guest