Table
!klplitlg | Center | Divide | TP | 406, | N Control | M Control |
Oscillator | Freq.* | R a t i o s | T P | 4071 | Lines | Lines |
Freq. | (MHz) |
| (MHz) |
|
| |
(MHz) |
|
|
|
|
|
|
I
INI M 
1
1 Bl 
1 B2 
I B3 
I B4 
I B5
280.0 | 389.5 | 8 | 4 | 2.5 | high | high | high high low |
282.5 | 427.0 | 7 | 4 | 2.5 | low high high high low | ||
284.0 | 449.5 | 8 | 5 | 2.0 | high | high h i g h l o w h i g h | |
285.0 | 464.5 | 6 | 4 | 2.5 | high low | high high low | |
286.0479.5 7 5 2.0 low high h i g h l o w h i g h
287.5502.0 5 4 2.5 l o w l o w high high low
288.0509.5 6 5 2.0 high low h i g h l o w h i g h
290.0 | 539.5 | 5 | 5 | 2.0 | l o w l o w | h i g h l o w h i g h | |||
292.0 | 569.5 | 4 | 5 | 2.0 | high | high | low | low | high |
292.5 | 577.0 | 3 | 4 | 2.5 | low | high | low | high | low |
294.0 | 599.5 | 3 | 5 | 2.0 | low | high | low | low | high |
295.0 | 614.5 | 2 | 4 | 2.5 | high | low | low | high | low |
296.0 | 629.5 | 2 | 5 | 2.0 | high | low | l o w l o w h i g h | ||
297.5 | 652.0 | 1 | 4 | 2.5 | low | low | low | high | low |
298.0 | 659.5 | 1 | 5 | 2.0 | low 1 | low | l o w l o w h i g h | ||
c To set the Sampling Oscillator to a desired frequency, set span to 0 Hz and CENTER FREQ to the value listed in the table.
tThe signals at TP406 and TP407 are TTL levels.
10. Measure the 280 MHz
A15TP400 | 0 dBm |
11.If the feedback signal is not near the indicated power, measure the signal at the following test points on the feedback path. Refer to function blocks AD, AG, and AH of Al5 RF Schematic (sheet 3 of 3).
A15TP200 | +7 dBm |
A15TP201 | +17 dBm |
A15TP202 | +8 dBm |
12. Measure the 20 MHz
A15TP401 | - 6 dBm |
13.If the IF signal is not near the indicated power, troubleshoot the loop mixer (function block AI).