 The preselector RH6323 is digitally tunable filter operating from 1.5 MHz to 30 MHz. This module consists of two (2) internal tunable bandpass filters (the frequency range divided between them in the following way: 1.5-6.7 MHz and 6.7-30 MHz) and the internal amplifier (it compensates filter’s insertion losses). RH6323 uses serial interface for tuning. |
RH6323
Specification: |
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| Frequency Coverage (3 bands) | 1.5 to 30 MHz | ||
| Input/Output Impedance: | 50 Ω | ||
| In-band Input/Output VSWR | 2:1 | ||
| In-band RF Power Handling | 5 Watt (input) | ||
| Out-band RF Power Handling | Up to 20 Watt | ||
| In-band Second Order Intercept Point | +100 dBm(input) | ||
| In-band Third Order Intercept Point | +40 dBm (input) | ||
| Center Frequency Drift: | ±80 PPM/ºC | ||
| Tuning Control | Serial | ||
| Tuning Speed | 10 µS | ||
| DC Power Consumption (Static) | 5V @800mA
12V @ 300mA |
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| Shape Factor (30 dB/ 3 dB) | 7 typical | ||
| Operating TemperatureRange | -40°C to +85°C | ||
| Size: | 146x88x18.2 mm | ||
| Weight: | 280 g | ||
| RF Connection | MCX | ||
RH6323 filters’ specification
| FrequencyRange | # | Bandwidth (3 dB), % | Insertion Loss, dB | Shape factor (30 dB) | ||
| Overall | Low Side | High Side | ||||
| 1.5-6.7 MHz | 5 | 4.6/5.5 | 5.0/5.9 | 5.8/6.1 | 6.8/7.3 | 4.8/4.9 |
| 4 | 3.6/4.5 | 5.2/6.2 | 5.9/6.2 | 6.9/7.2 | 4.9/5.0 | |
| 3 | 2.5/3.5 | 5.6/6.5 | 5.8/6.2 | 6.8/7.1 | 4.8/5.0 | |
| 2 | 1.7/2.4 | 6.1/6.9 | 5.9/6.1 | 6.7/7.2 | 5.1/6.1 | |
| 6.7-30 MHz | 5 | 4.6/5.5 | 4.3/5.2 | 6.1/6.3 | 7.0/7.4 | 5.1/5.2 |
| 4 | 3.6/4.5 | 4.7/5.8 | 6.1/6.5 | 7.3/8.0 | 4.9/5.2 | |
| 3 | 2.5/3.5 | 5.1/6.2 | 5.9/6.0 | 6.6/6.7 | 5.2/5.4 | |
| 2 | 1.7/2.4 | 5.4/6.6 | 5.8/6.1 | 6.6/7.2 | 5.0/6.1 | |
Note: table values are shown as average/maximum.
RH6323 block diagram
Frequency response functions and VSWR functions
The first frequency range (1.5-6.7MHz) has 364 tuning frequencies and the second frequency range (6.7-30MHz) has 389 tuning frequencies. Some frequency response functions and VSWR functions are shown below:
f0: 1.5 MHz; Bandwidth: 2.66%; VSWR: 1.29; OIL: –6.06 dB; OIL–10%: –31.56 dB; OIL+10%: –31.83 dB. |
f0: 4 MHz; Bandwidth: 2.88%; VSWR: 1.14; OIL: –5.39 dB; OIL–10%: –28.56 dB; OIL+10%: –30.30dB. |
f0: 8 MHz; Bandwidth: 2.55%; VSWR: 1.53; OIL: –4.98 dB; OIL–10%: –32.61 dB; OIL+10%: –34.8 dB. |
f0: 12 MHz; Bandwidth: 2.54%; VSWR: 1.30; OIL: –5.09 dB; OIL–10%: –32.81 dB; OIL+10%: –32.98dB. |
f0: 20 MHz; Bandwidth: 2.72%; VSWR: 1.10; OIL: –5.55 dB; OIL–10%: –30.02 dB; OIL+10%: –30.98dB. |
f0: 30 MHz; Bandwidth: 2.69%; VSWR: 1.13; OIL: –5.72 dB; OIL–10%: –29.78 dB; OIL+10%: –32.18dB. |
Note:f0— tuning frequency;VSWR — VSWR at f0frequency;OIL — insertion loss at f0;
OIL–10% — insertion loss at0,9f0;OIL+10% — insertion loss at 1,1f0.
1.5-6.7 MHz filter performance
The following diagrams show value of Insertion Loss at f0, Insertion Loss at 0.9f0, Insertion Loss at 1.1f0 and VSWR at each tuning frequency for 1.5-6.7 MHz filter.
Insertion Loss at f0 |
VSWR |
Insertion Loss at 1.1f0 |
Insertion Loss at 0.9f0 |
6.7-30 MHz filter performance
The following diagrams show value of Insertion Loss at f0, Insertion Loss at 0.9f0, Insertion Loss at 1.1f0 and VSWR at each tuning frequency for 6.7-30 MHz filter.
Insertion Loss at f0 |
VSWR |
Insertion Loss at 1.1f0 |
Insertion Loss at 0.9f0 |
Pinout & Ratings
| PIN # | Reference designator | Description | Notes |
| 1-6, 10 | N/C | No Connect | — |
| 7, 9, 11 | GND | Digital/RF Ground | — |
| 8 | VCC | +5V Power Supply Input | 4.75 to 5.25V @800mA |
| 12 | VDD | +12V Power Supply Input | 11.5 to 12.5V @300mA |
| 13 | STB | Strobe | Active: 5V; Inactive: 0V |
| 14 | CLK | Serial Clock | Active: 5V; Inactive: 0V |
| 15 | DI | Serial Data Input | Active: 5V; Inactive: 0V |
Serial interface description
Serial interface consists of 3 signals: CLK (clock), DI (data input), STB (strobe). Data input is 11 bits code. First 8 bits determine the tuning frequency and the last 3 bits determine the frequency band.
Frequencybandcode
| Frequency band | D9 | D10 | D11 |
| 1,5–4 MHz | 1 | 0 | 0 |
| 4–10 MHz | 0 | 1 | 0 |
| 10–30 MHz | 0 | 0 | 1 |
Tuning frequencycode
Tuning frequency code is calculated by X10 conversion into binary code. X10 is calculated by the formula:
f0 — tuning frequency; fl — low frequency of the band;fh — high frequency of the band.
Example
If you wish to tune to 8.02 MHz, the tune word is:
Mechanical Outline
Note:sizes are shown in millimeters.
