Lark Engineering HQ SERIES HQ Series SPECIFICATIONS STANDARD *SPECIAL ELECTRICAL Center Frequency (Fc) 100 to 1000 Mhz 80 to 1400 MHz 3dB Relative Bandwidth (% of FC) 4 to 40 4 to 50 Number of Sections Available 3 to 8 2 to 10 Nominal Impedance 50 Ohms 50 to 75 Ohms Maximum Insertion Loss See Curve See Curve Maximum VSWR 1.5/1 1.3/1 Attenuation in the Stopband See Graph See Graph Maximum Input Power (Average)(Watts to 10,000 ft.) 500 x 3dB BW (MHz) Maximum Input Power (Peak)(Watts to 10,000 ft.) 300 x 3dB BW (MHz) (Loss Factor)(Fc MHz) Fc (MHz) See Standard 2,000 ENVIRONMENTAL Shock 15 G's 25 G's Vibration 5 G's 10 G's Humidity 90% relative 100% relative http://www.larkeng.com/BDPASS/HQ.htm (1 of 4) [1/17/2002 2:30:33 PM] Lark Engineering HQ SERIES Altitude Unlimited Unlimited Temperature Range (Operating) -25 to + 50 degrees celsius -54 to + 85 degrees celsius Temperature Range (Non-Operating) -54 to + 70 degrees celsius -54 to +100 degrees celsius MECHANICAL Approximate Weight 0.75 oz. per inch 0.75 oz. per inch Mounting Provisions See diagram See diagram INSERTION LOSS: The Maximum Insertion Loss at center frequency is equal to : LF x (N + 0.5) / % 3 dB BW + 0.2 Where: LF= Loss Factor, N= Number of Sections % 3dB BW: 3dB BW (MHz) x 100 divided by Center Frequency (MHz) Example: A 3 section HQ with a center frequency of 400 MHz and a 3dB BW of 40 MHz would have, 1.5 x 3.5 / 10 = 5.25 / 10 = 0.525 0.525 + 0.2 = 0.8 dB http://www.larkeng.com/BDPASS/HQ.htm (2 of 4) [1/17/2002 2:30:33 PM] Lark Engineering HQ SERIES Connectors Available on HQ Series: Lark Code A B C Type SMA JACK SMA PLUG TNC JACK C DIM. Inches & MM .800 & 20.3 .855 & 22.5 1.350 & 34.3 Lark Code G H L D TNC PLUG 1.280 & 32.5 *M E F BNC JACK BNC PLUG 1.350 & 34.3 1.280 & 32.5 S Type N JACK N PLUG SOLDER MPIN AXIAL SOLDER PIN RADIAL SPECIAL *Not recommended for use with this series. http://www.larkeng.com/BDPASS/HQ.htm (3 of 4) [1/17/2002 2:30:33 PM] C DIM. Inches & MM 1.625 & 41.3 1.585 & 40.3 .625 & 15.9 .625 & 15.9 Lark Engineering HQ SERIES LENGTH: The approximate length of a Lark HQ series filter can be determined by the formula: ( 0.5 N + 2 / %BW ) x LC = L Where N is the number of sections used, % BW is: 3dB BW (MHz) x 100 divided by CENTER FREQUENCY (MHz) LC is the length constant at the specified center frequency, L is the dimension between the connectors; C1 and C2 are the connector lengths as shown above. All of the length information given here is approximate. Exact length specifications must be quoted by the factory. If a special length is needed, please submit all of your requirements - both electrical and mechanical. This will enable Lark Engineering to quote the optimum design for your application. Example: A 3 section HQ with a center frequency of 400 MHz a 3dB BW of 40 MHz and SMA jack input and output connectors would be: (1.5 + 0.2) x 1.38 = 2.35 + C1 + C2 In most cases, the L dimension is rounded to the nearest 1/4 inch which in this instance would be 2.25 inches and the O.A.L. is: 2.25 + .800 + .800 = 3.85 inches. To convert inches to millimeters multiply x 25.40. http://www.larkeng.com/BDPASS/HQ.htm (4 of 4) [1/17/2002 2:30:33 PM] STOPATT5.HTM STOPBAND ATTENUATION The graph on the following pages defines the normal specification limits on attenuation Lark bandpass filter series HP, HQ, SF, and SM. The minimum level of attenuation in dB is shown as a "number of 3dB bandwidths from center frequency". Since the frequency characteristics vary for differing bandwidths, it is necessary to establish specifications for each bandwidth of filter. The different graphs represent various 3dB percentage bandwidths. Intermediate values should be interpolated. The 3dB percentage bandwidth is defined as follows: http://www.larkeng.com/BDPASS/stopatt.htm (1 of 6) [1/17/2002 2:30:50 PM] STOPATT5.HTM As the 3dB bandwidth is exactly 10% of the center frequency, the answer can be read directly from the 10% graph. Using the 5 section curve at the point -1.5 (255 MHz) we find the minimum level of attenuation is 36dB. At +1.6 (348 MHz) the minimum level of attenuation is 48dB. For special requirements, please contact our Application Engineering Department. STOPBAND ATTENUATION STOPBAND ATTENUATION http://www.larkeng.com/BDPASS/stopatt.htm (2 of 6) [1/17/2002 2:30:50 PM] STOPATT5.HTM STOPBAND ATTENUATION http://www.larkeng.com/BDPASS/stopatt.htm (3 of 6) [1/17/2002 2:30:50 PM] STOPATT5.HTM STOPBAND ATTENUATION http://www.larkeng.com/BDPASS/stopatt.htm (4 of 6) [1/17/2002 2:30:50 PM] STOPATT5.HTM STOPBAND ATTENUATION http://www.larkeng.com/BDPASS/stopatt.htm (5 of 6) [1/17/2002 2:30:50 PM] STOPATT5.HTM http://www.larkeng.com/BDPASS/stopatt.htm (6 of 6) [1/17/2002 2:30:50 PM]