1705
The Tektronix 1705A is a spectrum monitor designed primarily for locating Ku or C-Band satellites and monitoring their signals with a 3 X 4 in. (80 X 100 mm) monochrome CRT display.
It operates by using LNB down converters to the L-Band (950 MHz to 1.8 GHz), and monitoring up link transmissions utilizing an upconverter to the 70 MHz IF (45 MHz to 100 MHz). The resolution bandwidths 10 kHz and 300 kHz provides measurement resolution proportional to the frequency accuracy or span.
The CRT has a graticule that can be lit up or not depending on the internal jumper position. With non-volatile memory (NVRAM) the current front-panel switch settings can be saved, at power down, so that the 1705A can come back with the last front-panel setup. The user interface has on-screen frequency readout, as well as setup menus. The L-Band readout may be reconfigured to display a satellite frequency in the range of 0.9 GHz to 20 GHz.
Key Specifications
| Frequency | L-Band: 950 MHz to 1.8 GHz; 70 MHz band: 45 MHz to 100 MHz |
|---|---|
| Frequency Span | L-Band: Full, 10 MHz/div, 1 MHz/div, and 10 kHz/div; 70 MHz: Full, 1 MHz/div, and 100 kHz/div |
| Resolution Bandwidth | -6 dB bandwidth selections are 300 kHz, and 10 kHz |
| RF Input | 75 Ω |
| Maximum Safe Input Power | L-Band: –30 dBm; 70 MHz: –20 dBm |
| Minimum Signal Input | –80 dBm |
| Video Filter | Reduces Video Bandwidth to ≈ 10 kHz |
| RF Attenuator Range | No built-in internal attenuation. Apply an external attenuator to keep the maximum safe input power below the rating listed above |
| Sweep Speed | 20 ms to 200 ms, variable |
| Weight | Standard accessories: 3.8 kg (8.5 lbs) |
| Power | 90 − 250 VAC, 48 to 66 Hz, 35 W |
Rear panel:
- L-BAND INPUT, F connector: 900 – 2000 MHz down-converted from L-Band RF by a low-noise block converter (LNB)
- LNB POWER switch enables or disables an 18 V supply for the LNB at the L-band input
- 70 MHz INPUT BNC connector (for 45 MHz – 100 MHz RF)
Options
- Opt. 74: White CRT Phosphor
- 1700F00: Plain Cabinet
- 1700F02: Carrying Case
- WFM7F05: Side-by-Side Rack Adapter
- 1700F06: Blank Panel
- 1700F07: Utility Drawer
