Wavetek 147 Especificações descarregar pdf (Página 361)

100

101

Application Notes: Proofing and Testing

337

Sweepless mode if using a function generator. Connect the Tx or function

generator to the Video In port on the modulator that you are going to test.

Next, connect your field unit to the modulator output and press the SWEEP

button. Once you have adjusted your Start and Stop frequencies to match

the particular channel plan, you will see the response of the channel under

test.

Press the “func” and “6” key to store this trace as a Sweep Reference.

Proceed out into the system, connect your field unit to the appropriate

location and press the SWEEP button. You will again see the response of

the channel under test.

The MAX/MIN reading on your unit is the In-Channel Response of that

channel and dependent upon the marker locations. Below is an example of a

channel plan to do the ICR test on channel 2.

CNR & Distortions [76.605(a)(7,8)]

To get the best carrier-to-noise ratio (CNR) readings for a 79 channel loaded

system, the RF level should be between 10 and 14 dBmV. The dynamic

Chan

Ch.

Type

Freq.

(MHz)

Audio

(MHz)

Meas

B W

Noise

Offset

Ena Tilt Swp Scr

201 TV 54.7 4.50 4.0 2.50 4 4 4

202 TV 55.2 4.50 4.0 2.50 4 4 4

203 TV 55.7 4.50 4.0 2.50 4 4 4

204 TV 56.2 4.50 4.0 2.50 4 4 4

205 TV 56.7 4.50 4.0 2.50 4 4 4

206 TV 57.2 4.50 4.0 2.50 4 4 4

207 TV 57.7 4.50 4.0 2.50 4 4 4

208 TV 58.2 4.50 4.0 2.50 4 4 4

209 TV 58.7 4.50 4.0 2.50 4 4 4

210 TV 59.2 4.50 4.0 2.50 4 4 4

1 2 ... 356 357 358 359 360 361 362 363 364 365 366 ... 409 410

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