70 - 70.5 MHz 100W Transmitting - Receiving Low Loss Bandpass Filter

  • 70 - 70.5 MHz 100W  Transmitting - Receiving Low Loss Bandpass Filter

4 Meter Band Pass Filter. Designed for 100W Transmitters. Low Loss BPF 70 - 70.5 MHz.

This filter is designed to withstand 100 W transmitters but is also ideal for receiving. Its low losses of only 0.12 dB will not be noticed in the system. Filter has 50% power margin. So even power spikes or more power wont be a problem.

70 MHz band pass filter has input return loss batter than -35 dB and more on whole 4 meter band!

External appearance for 70 - 70.5 Mhz 100 W Low Loss Bandpass filter:

4meter-70MHz-100W-Low-Loss-Bandpass-Filter-Antennas-Amplifiers.com

Achieved results on a built Bandpass filter:

1.8 MHz < -96 dB
3.8 MHz < -96 dB
7.1 MHz < -87 dB
14.15 MHz = -68 dB
21.2 MHz = -56 dB
28.4 MHz = - 47 dB
50 MHz = -20 dB 
70 MHz = -0.12 dB, Input RL better than -35dB
70.5 MHz = -0.12 dB, Input RL better than -35dB
100 MHz= -15 dB
144 MHz = -38 dB
146 MHz = -39 dB
148 MHz = -39 dB
432.1 MHz = -63 dB
460 MHz = -57 dB
These excellent results were achieved by careful selection of components and design of the filter. 

The measured data on the assembled filter with HP8753ES full 2-port calibrated are presented below. The following images show the S parameters of the most important points.

Characteristics of 70 - 70.5 MHz Band-pass filter:

Insertion loss 0.119 dB, return batter than 35dB.
4meter-70MHz-100W-Transmit-Receive-Bandpass-Filter-Antennas-Amplifiers.com

Characteristics of the filter outside the receiving range:

1. Measured HF attenuation:
70MHz-Bandpass-Filter-100W-HF-Suppression-Antennas-Amplifiers.com

2. Measured HF - 50 MHz - FM attenuation:
70MHz-Bandpass-Filter-100W-HF-6meter-FM-Suppression-Antennas-Amplifiers.com

3. Measured attenuation for 2 meter and 70 cm band:
70MHz-4m-Bandpass-Filter-100W-HF-50MHz-2m-70cm-Suppression-Antennas-Amplifiers.com

Similar band-pass products for 4 meter band:

4 meter band, 70 MHz Bandpass filter Receiving (Economic) for Ham radio: 70 - 70.5 MHz Receiving (Economic) Band-Pass Filter

4 meter band, 70 MHz Bandpass filter 300 W for Ham radio: 70 - 70.5 MHz 300 W Low Loss Bandpass Filter for 4 meter band

Fast link to our 4 Meter Antennas and Dual Band 4m 6m Antennas.


  • Product Code: 0640
  • Availability: In Stock
  • 139.00€


Tags: 70MHz, 70.5MHz, 100W, 4meters, VHF, BandPass, RFI, Band-Pass, Filter, BPF, LowLoss, Receiving, Transmitting