4 meter 70 MHz 300 W High Power Low Loss Band-pass Filter

4 meter 70 MHz 300 W High Power Low Loss Band-pass Filter

195,00 

SKU: 6160 Categories: ,

4 meter 70 – 70.5 MHz 300 W Low Loss Transmitting Band Pass Filter

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

Although the intention of this filter is to be used as a transmitting filter, the design allows also it to be used as a receiving filter before wideband LNA to protect sensitive devices from strong out-of-band signals.

70MHz-4m-High-Power-Bandpass-Filter-Made-By-antennas-amplifiers.com

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

The filter will reduce the TVI problems or your problem with neighbors with strong HF, 6m, 88-108MHz, 2m, or 70cm transmitters.

 

Measured data on the assembled filter with HP8753ES network analyzer full 2-port calibrated are presented below.

Measured Return Loss – S11 (CH1) and Insertion Loss – S21 (CH2). Characteristics of 70 – 70.5 MHz Bandpass filter for up to 300 W Transmitter. 

 

4-meter-70-MHz-Bandpass-filter-S11-S21-Finished-filter-Made-By-antennas-amplifiers.com

 

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 the of components and design of the filter.
Band Pass filter will suppress any harmonic emission from your transceiver or linear amplifier.

4-Meter-70-MHz-Bandpass-Filter-High-Quality-Made-By-Antennas-Amplifiers

SWR from 70 MHz to 70.5 MHz:

70MHz-Band-Pass-Filter-SWR-Made-By-Antennas-Amplifiers.com

4 Meter Band. The flatness of insertion loss on working frequency:

4m-Band-Pass-Filter-Flatness-6m-FM-Made-By-Antennas-Amplifiers

Suppression of harmonics and interfering signals on VHF and UHF:

70-MHz-Band-Pass-Filter-Harmonics-2m-70cm-Suppresion-Made-By-Antennas-Amplifiers.com
Feel free to send e-mail if you need something more specific.

All band-pass filters are here: HF, VHF, and UHF Band-Pass Filters

Direct link to all 4-meter filters. We have 50 W, 100 W, 200 W, 300 W, 1500 W and 4000 W versions: 4 Meter Band-Pass Filters

 

Weight 0,63000000 kg

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