NOTE 5. SPURIOUS RECEIVE SIGNALS

TM 11 5820-919-40-2

TABLE A

NOTE 5. SPURIOUS RECEIVE SIGNALS

FREQ (MHz)

1. A spurious receive signal is an audio tone heard in the handset in receive when no tone should be present (i.e., no

2.2222

5.6250

12.0833

17.7777

25.3571

signal present at the antenna connector). These signals are produced as a result of interaction (harmonic crossover)

2.5000

5.7143

12.5000

17.9167

25.4167

between the first and second local oscillators. Military specifications for this radio set permit a maximum of 200

2.9412

5.8000

12.7273

17.9169

25.5555

spurious signals to be generated within the frequency synthesizer, A1A3, without adversely affecting the radio set's

3.0555

5.8333

12.8125

18.6666

25.6250

acceptability. Table A lists those frequencies at which acceptable spurious signals may be encountered in some

3.1250

6.0000

12.9167

18-7500

25.7143

radio sets. In addition to those frequencies listed in table A are the fundamental of the 5 MHz local oscillator (see

3.3333

6 1338

13.1250

18.8235

26.0000

frequency [sited on case of 5 MHz L.O., A1A3U1).

3.4375

6 2500

13.3333

18.8888

26.2500

2. Use of table A: For each frequency listed at which acceptable spurious signals may be encountered, there are

3.5294

6.6666

13.5000

19.0909

26.3636

several dial frequencies at which audible tones may be heard.

3.7500

7.0833

13.6111

19-1666

26.6666

4.0000

7.2727

13.6364

19.6429

26.9231

Example: Internally generated spurious signal at 13.5000 MHz.

4.0625

7.5000

13.7500

20.0000

27.1429

a. With a dial frequency of 13,501.0KHz, LSB selected, the audio tone produced would be 1.0 KHz.

4 1666

7.6471

14.0000

20.3125

27.2727

4 2857

7 8125

14.1176

20.3571

27 5000

b. With a dial frequency of 13,498.6~Bz, USB selected, the audio tone produced would be 1.4 KHz.

4.3750

8 0000

14.2857

20.5000

27 6923

4.4444

8.1818

14.3750

20.6250

28.2143

4.5000

8.6375

14.4444

20.6666

28.5000

4.5455

8.5000

14.5455

20.9091

28.5714

4.5833

8.6666

14.6875

21.3333

28.7500

4.6154

8.9474

14.7059

21.5000

29.1666

4 6429

9.1666

15.3125

21.5385

29.2308

4 6666

9 3333

15.3333

21-7857

29.3750

4.6875

9 5000

15.3571

21.8750

29.5000

4 7059

9.6429

15.5000

22.0000

29.5833

4 7222

9 6875

15.6250

22.2222

29.9999

4.7368

9 7222

15.7141

22.3077

5 2632

10.0000

15.7143

22.5000

5 2777

10.3125

16.0000

23.0769

5.2941

10.3371

16.0714

23.3333

5.3125

10 6666

16.1538

23.5000

5.3333

10 7692

16.5000

23.7500

5.3571

11.0714

16.6000

23.8462

5.3846

11.1111

16.7857

24.0000

5 4167

11.2500

16.9231

24.2857

5 4545

11 5385

17.1429

24.3750

5.5000

11 8182

17.5000

24.5833

5.5555

11.8750

17.6923

24.6875