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I needed a service manual as the display on my oscilloscope was very dim. I thought I'd give owner-manuals.com a try, as they advertised a huge number of manuals. Sure enough they had one listed. I bought it hoping it would be useful... actually, I bought it hoping it would be readable! I've had manuals from online sources in the past, and been very disappointed. Not this time! An excellent manual, complete, and very readable. Using it I fixed my 'scope, and as such the manual was an investment that paid off manyfold. Do I have any complaints? One very minor one - The circuit diagrams could have been scanned at a higher resolution, as some of the details were a little difficult to make out - not impossible, just not as easy as my old eyes would like! Overall, I'm very satisfied with my manual, and I will certainly be using this company again. Well done.
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I Have looked for this manual for quiet a while now, I have finally found it here. I believe this is the only place they have them in a very nice scan, pages are very clear to read, some of the pages are a bit tilted but overall it is great to have this manual available for purchase. Thanks
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This is quiet a rare manual, I Have looked for this manual for quiet a while now, I have finally found it here. I believe this is the only place they have them in a very nice scan, Excellent guide: very clear, enabling us to print readable diagram overall it is great to have this manual available for purchase. This is a complete service manual no pages are missing. Thanks
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This SM is quiet scarce and hard to find it is an excellent Service manual, very clear to read and to print schematics and diagrams, Hi quality, Complete manual with no pages missing. I am very pleased with the manual and the fast service I have received. Great place to shop.
Good luck finding you manual...
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Quick delivery, the document was usefull, although the copy was i little bit unclear in the details.
TEST AND MEASUREMENT
17. Repeat steps 6 to 15 for GSM 1800 on the channels listed below.
Channel Bch Lch Mch Hch Tch GSM 1800 520 630 700 810 870
6.6 I and Q Values
NOTE: By observing the image leakage and adjusting the relative gain between I and Q channels, phase error and modulation spectrum can be improved. With the I, Qch adjustment procedures the transmitter must be set to Power Level 5 (this presents the worst case of non-linearity) so care must be taken that the spectrum analyser used can accept a signal input of 33 dBm. If not, an appropriate attenuator must be used.
I, Qch Gain
IMPORTANT: I, Qch offset calibration should be done before this calibration. Spectrum Analyser Setup. centre frequency = 902.4 MHz RBW = 10 kHz VBW = 10 kHz Span = 1 MHz Sweep time = 2 sec 1. On the Channel box, highlight CHANGE CH GSM. a. Press the left-right arrow keys until channel number �62� is visible in the window. Press ENTER to select. b. Press the down-arrow key until the POWER LEVEL field is highlighted. Press the left-right arrow keys until PL5 is visible in the window. Press ENTER to select. c. Press the down arrow until the TX DATA field is highlighted. Press the left-right arrow keys until NRL 1 is visible in the window. Press ENTER to select.
Figure 6.24: Image leak ratio 2. Using the spectrum analyser measure the image leak ratio. Image leak ratio is the measured ratio of peak power and the power at 135 kHz below peak frequency.
Example: peak power (902.468 Mhz) = 33 dBm power at 135 kHz below peak power = -9 dBm image leak ratio = 33 dBm - (-9 dBm) = 42 dBm MCUK990801C8 Service Manual Section 6 � 45 � Issue 1 Revision 0
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