HP8648A RF Signal Generator

★ Level accuracy ± 1dB throughout the entire 2.5GHz range
★ Remaining frequency modulation at 4Hz on 500MHz
★ Electronic attenuator (1GHz type)
★ Output power is+10/+13~-136dBm
★ Easy to operate and reliable
★ Generate paging signaling (HP8648A option 1EP)
RF signal generator/HP8648A
HP8648A/RF signal generator
Spot supply

Technical parameters of HP8648A RF signal generator:

frequency
HP8647A：250 kHz~1000 MHz
HP8648A：100kHz~1000 MHz
HP8648B：9 kHz~2000 MHz
HP8648C：9 kHz~3200 MHz
HP8648D：9 kHz~4000 MHz
resolving power
HP8647A：1Hz；
HP8648A/B/C/D：0.001 Hz
Display: 10 Hz
Conversion rate (typical value)
HP8647A：＜120ms
HP8648A/B/C/D：＜1001 MHz：＜75 ms； ≥ 1001 MHz：＜ 100 ms
Accuracy (after preheating for 1 hour and within 1 year calibration period):
The typical value is ± 3 × 10-6 × carrier frequency (in Hz);
For option 1E5, the carrier frequency is ± 0.15 × 10-6 × (typical value is ± 0.072 × 10-6 × fc)
Internal reference oscillator
Accuracy and stability (related to calibration adjustment, after preheating for 1 hour and within 1 year calibration period), ± aging rate ± temperature influence ± power supply voltage influence

Output: At 10 MHz, typical value>0.5 V rms (50 Ω load)
External reference oscillator input: accepts inputs of 2, 5, 10MHz ± 5ppm, with a level range of 0.5~2Vrms (50 Ω load)

Spectrum purity
Harmonic (output ≤ 4dBm):<- 30dBc
Sub harmonic (output ≤+4dBm):
＜1001MHz：- 60dBc；
＞1001MHz：- 50dBc；
＞3200MHz：- 40dBc；
Non harmonic: (≥ 5kHz offset, ≤+ 4dBm output level)
HP 8647A：＜-60 dBc(220~250 MHz，-55 dBc)
HP 8648A/B/C/D：
＜-249 MHz：＜- 55 dBc；
＜2001 MHz：＜- 54 dBc
＜-1001 MHz：＜- 60 dBc；
≤4000 MHz：＜- 48 dBc
Remaining modulation (CCITT, rms)
HP 8647A
＜249 MHz：＜ 20 Hz, typical value<11 Hz
＜501 MHz：＜ 10 Hz, typical value<6 Hz
≤1000 MHz：＜ 20 Hz, typical value<1 Hz
HP 8648A/B/C/D
＜249 MHz：＜ 7 Hz, typical value<4 Hz
＜501 MHz：＜ 4 Hz, typical value<2 Hz
＜1001 MHz：＜ 7 Hz, typical value<4 Hz
＜2001 MHz：＜ 14 Hz, typical value<8 Hz
≤4000 MHz：＜ 28 Hz, typical value<12 Hz

Single sideband phase noise (typical value at 20 kHz offset)
HP 8647A
At fc=500 MHz:<- 110 dBc/Hz；
At fc=1000 MHz:<- 106 dBc/Hz
HP 8648A/B/C/D
At fc=500 MHz:<- 120 dBc/Hz；
At fc=3000 MHz:<- 106 dBc/Hz
At fc=1000 MHz:<- 116 dBc/Hz；
At fc=4000 MHz:<- 104 dBc/Hz
At fc=2000 MHz:<- 110 dBc/Hz

Output level
Range
HP 8647A and HP 8648A:+ 10~-136 dBm；
HP 8648B/C/D：
≤2500 MHz：+ 13~-136 dBm；
＞2500 MHz：+ 10~-136 dBm

Display resolution: 0.1 dB
Accuracy: (rated power<13 dBm~-127 dBm)
HP 8647A：±1.5 dB
HP 8648A/B/C/D (applied at 25 °± 5 ℃):
≤2500MHz：±1.0dB
≤3200MHz：±1.5dB(≥-100dBm)； ±3.0dB(＜-100dBm)
≤4000 MHz：±2.0dB(≥-100dBm)； ±3.0dB(＜-100dBm)
Reverse power protection (power to 50 Ω load, in W)
HP 8647A and HP 8648A/B: 50 W HP 8648C/D: 50 W ≤ 2000 MHz; 25 W＞2000 MHz
Standing wave ratio: (input<-6dBm, typical value)
HP 8647A： ≤2.0∶1
HP 8648A/B/C/D：
＜249 MHz：＜ 2.5∶1
≤2500 MHz：＜ 1.5∶1
≤3200 MHz：＜ 2.0∶1
Output impedance: rated 50 Ω

frequency modulation

resolving power
For ≤ 10% peak frequency offset ＜ 2001 MHz: 10 Hz ≥ 2001 MHz: 20 Hz
For frequencies ranging from>10% to * large peak frequency offset<2001 MHz: 100 Hz ≥ 2001 MHz: 200 Hz
Frequency offset accuracy (internal rate 1 kHz)
HP 8647A: ± 7.5% FM frequency offset ± 30 Hz

HP 8648A/B/C/D
＜ 1001 MHz: ± 3% frequency offset ± 30 Hz
＜ 2001 MHz: ± 3% frequency offset ± 60 Hz
≤ 4000 MHz: ± 3% frequency offset ± 120 Hz
For HP8648A option 1EP
50 Hz in the range of 276~284MHz, 406~512MHz, and 929~932MHz
rate
HP 8647A
Internal: 400 Hz or 1 kHz
External DC: dc~75 kHz (typical value, 3 dB bandwidth)
External communication: 20 Hz~75 kHz (typical value, 3 dB bandwidth)
HP 8648A/B/C/D
Internal: 400Hz~1kHz (10Hz~20kHz for option 1E2)
External DC: dc~150kHz (typical value, 3 dB bandwidth)
External communication: 1 Hz~150 kHz (typical value, 3 dB bandwidth)
Distortion (1 kHz, total harmonic distortion+noise, 0.3-3 kHz)
<1001 MHz:<1% when frequency offset>4 kHz
<2001 MHz:<1% when frequency offset>8 kHz
≤ 4000 MHz:<1% when frequency offset>16 kHz
HP 8648A/B/C/D 88~108 MHz： When the frequency offset is ≥ 75 kHz, it is less than 0.5%
Carrier frequency accuracy (relative to continuous wave during DC frequency modulation, at 25 °± 5 ℃)
＜ 1001 MHz: ± 100Hz (typical value, 40Hz *), frequency offset ＜ 10 kHz
＜ 2001 MHz: ± 200Hz (typical value, 80Hz *), frequency offset ＜ 20 kHz
<4000 MHz: ± 400Hz (typical value, 160Hz *), frequency offset<40 kHz
FM+FM： Internal 1 kHz, 400 Hz signal sources plus external sources. In the internal and external FM mode, the internal signal source generates a set frequency offset. The external input should be set to ≤± 0.5 Vpeak or 0.5 Vdc (half of the set frequency offset).

phase modulation
Peak frequency offset
＜ 249 MHz: 0~10 radians
＜ 501 MHz: 0-5 radians
＜ 1001 MHz: 0~10 radians
＜ 2001 MHz: 0-20 radians
≤ 4000 MHz: 0-40 radians
resolving power
＜ 2001 MHz: 0.01 radians
≥ 2001 MHz: 0.02 radians
Frequency offset accuracy (internal rate 1 kHz, typical value)
HP 8647A RF signal generator: ± 7.5% frequency offset ± 0.05 radians
HP 8648A/B/C/D RF Signal Generator
＜ 1001 MHz: ± 3% frequency offset ± 0.05 radians
＜ 2001 MHz: ± 3% frequency offset ± 0.1 radians
≤ 4000 MHz: ± 3% frequency offset ± 0.2 radians
rate
Internal: 400Hz or 1kHz (10Hz~20kHz for 8648A/B/C/D RF signal generators with option 1E2 only)
External: 20 Hz~10 kHz (typical value, 3dB bandwidth)
Distortion (1 kHz rate)
HP 8647A RF signal generator:<2% when frequency offset ≥ 3 radians
HP 8648A/B/C/D RF Signal Generator
＜ 1001 MHz: ＜ 1% when frequency offset ≥ 3 radians
＜ 2001 MHz: ＜ 1% at frequency offset ≥ 6 radians
≤ 4000 MHz: ＜ 1% when frequency offset ≥ 2 radians
*Within 1 hour after DC frequency modulation calibration

amplitude modulation
(AM is not specified below 1.5 MHz, but generally specified above 1001 MHz)
Range: 0~100%; Output ≤+4dBm
Resolution: 0.1%
Accuracy (1 kHz rate): ± 5% ± 1.5% of the set value (for HP 8648B/C/D RF signal generator, this technical specification can be used under modulation depth conditions of 25 °± 5 ℃ and<70%)
rate
Internal: 400Hz or 1kHz (10Hz~20kHz for 8648A/B/C/D with option 1E2 only)
External DC: dc~25 kHz (typical value, 3dB bandwidth)
External communication: 1 Hz~25 kHz (typical value, 3dB bandwidth)
Distortion (1 kHz, total harmonic distortion+noise, bandwidth of 0.3~3 kHz)
HP8647A and HP8648A RF signal generators: at 30% AM:< 2%；
At 90% AM:< 3%
HP8648A/B/C/D RF signal generator:
At 30% AM:<2%; At 70% AM:< 3%

Pager Test Option 1EP (only for HP 8648A RF Signal Generator)
Signaling standards: POCSAG, FLEX, and FLEX-TD (RCR-43)

Pulse option 1E6(For HP 8648B/C/D only) RF signal generator
On/off ratio:
＞80 dB(＜2000 MHz)；
＞70 dB(≥2000 MHz)
Rise/fall time: 10 ns

Modulation generator option 1E2(Only used for HP 8648A/B/C/D RF signal generators)
Add variable frequency modulation generator
Frequency range: Sine wave: 10Hz~20kHz
Square wave, triangular wave, sawtooth wave: 100Hz~2kHz
Frequency accuracy: ± 0.01%, typical value
Frequency resolution: 1Hz (displaying 3-digit numbers)

Modulation source
Internal: 400Hz or 1kHz, with rated 1Vp-p to 600 Ω load provided by BNC connectors on the panel
External: Full scale modulation requires 1Vpeak to be provided on a 600 Ω (rated) load (high/low indicator to be provided for external signals ≤ 10kHz).

Remote programming
Interface: HP-IB with Listening and Speaking (IEEE-488.2-1987)
Control language: SCPI 1992.0A version, HP8648A/B/C/D encoding compatible with HP8656B and 8657
Controlled functions: all panel functions except for the power switch button
IEEE-488：SH1，AH1，T6，TE0，L4，LE0，SR1，RL1，PP0， DC1，DT0，C0，E2

Compliant with ISO standards
The 8647A and 8646A/B/C/D RF signal generators are produced by factories that have obtained ISO 9002 certification and comply with HP's commitment to quality.

General specifications of HP8648A RF signal generator
Power requirements: 90-264V, 48-440Hz, 170VA (* maximum)
Working temperature: 0 ° C to 50 ° C
Leakage: Conducted interference and radiated interference meet MIL-STD-461B, RE02, and FTZ1064 standards. Typical value<1 μ V.