Search

4m 70MHz 300W High Power Low Loss Bandpass Filter

4m 70MHz 300W High Power Low Loss Bandpass Filter
Product Code: 0631
Price: 159.00€
   - OR -   

70 - 70.5MHz 300W Low Loss Transmitting Band Pass Filter for 4meter band

70MHz-4m-High-Power-Bandpass-Filter

Intended to be used with transceivers like Icom IC-7100, Yaesu FT-847, transverters and linear amplifiers up to 300W output.

Although intention of this filter is to be used as transmitting filter, design allows also to be used as receiving filter before wideband LNA to protect sensitive device from strong out of band signals. Like this.

This BPF will suppress any signals from HF 1.8 - 28MHz stations 50-54MHz, FM, 144 MHz and 432MHz (430 - 440MHz).

Filter will reduce TVI problem or your problem with neighbours with strong HF, 6m, 88-108MHz, 2m or 70cm transmitters.

Here are presented measured results with HP8753ES network analyzer full two port calibrated.

Return Loss (S11)

Insertion Loss (S21)

4metre-70MHz-Bandpass-filter-S11-S21-Finished-filter

Achieved results on a built Bandpass filter:

1.8 MHz < -100 dB    
3.8 MHz < -100 dB   
7.1 MHz < -100 dB   
14.15 MHz = -84 dB
21.2 MHz = -73 dB
28.4 MHz = - 64 dB
50 MHz = -36 dB 
51 MHz =- 34.5 dB
70 MHz = -0.24 dB
70.1 MHz = -0.24 dB
70.25 MHz = -0.24 dB
70.5 MHz = -0.25 dB
 
Harmonics and interfering signals:
88 MHz= -25 dB
98 MHz= -36 dB
108 MHz= -41 dB
140.2 MHz = -54 dB  
144.1 MHz = -55 dB
432.1 MHz = -62 dB 
 
These excellent results were achieved by careful selection of components and design of the filter.
Band Pass filter will suppress any harmonic emission from your transceiver or linear amplifier.
 
4meter-70MHz-Bandpass-Filter
 
More measured results with HP8753ES network analyzer full two port calibrated.
 
SWR:
70MHz-Band-Pass-Filter-SWR
 
 
 
Zoomed S11:
4m-70MHz-Bandpass-Filter-S21-Zoomed
 
Zoomed S21:
70MHz-Bandpass-Filter-S21-Zoomed-Filter
 
4m Flatness:
4m-Band-Pass-Filter-Flatness-6m-FM
 
 
Suppression of harmonics and interfering signals::
70MHz-Band-Pass-Filter-Harmonics-2m-70cm-Suppresion
 
 
4metre 70MHz Band Pass Filter HF Suppression:
70MHz-High-Power-Bandpass-Filter-300W-HF-Bands-Suppresion
 
 
70MHz 300W BPF 144MHz suppression:
70MHz-HP-Band-Pass-Filter-144MHz-Suppresion
 
 
4m Band Pass 50MHz 6m suppression:
High-Power-4m-Bandpass-Filter-HF-50MHz-Suppresion
 
Copyright   2014 - All Right Reserved DUAL Serbia