RH6323- 1.5 to 30 MHz

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:
	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
	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; f_l — low frequency of the band;f_h — 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.