50 – 54 MHz 4000 W Super Low Loss Bandpass Filter BPF for 6 Meter band.
Intended to be used with linear amplifiers 8877, GS35, GS31, 2xGI7B, and with other tubes. 6-meter Bad-Pass filter will easily handle any up to 4000 W linear amplifier.
50-54MHz Bandpass Filter BPF uses high Q coils and capacitors with a Q of more than 4000. Low loss of filter is achieved with careful design and adjustment.
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 with PGA-103+ to protect sensitive devices from strong out-of-band signals.
This BPF will suppress any harmonic on 100 MHz, 150 MHz, and more.
The recorded data on the assembled filter with HP8753ES network analyzer full 2-port calibrated are presented below.
1.8 MHz< -79 dB
3.8 MHz = -60 dB
7.1 MHz = -43 dB
14 MHz = -18 dB
50 MHz = -0.08 dB
51 MHz = -0.085 dB
52 MHz = -0.09 dB
53 MHz = -0.09 dB
54 MHz = -0.09 dB
88 MHz = -27 dB
100 MHz = -51 dB
102.7 MHz = -83 dB
108 MHz = -50 dB
144 MHz = -46 dB
150 MHz = -45 dB
162 MHz = -47 dB
200 MHz = -49 dB
430 MHz = -58 dB
432 MHz = -55 dB
440 MHz = -41 dB
We measured Return Loss (S11) and Insertion Loss (S21). Characteristics of 50 – 54 MHz Bandpass filter for up to 4000 W linear amplifier.
Additional Measurements for 6 Meter 4 kW Band-pass filter:
1. Zoomed measured data of 50 – 54 MHz transmitting band-pass filter. Insertion loss – S21 (Attenuation) is set to 0.2 dB per division! The same attenuation can be seen at every band point, as well as super high adaptation.
2. Deep notch for FM frequencies between 100 MHz and 108 MHz. More than 50 dB of attenuation (2nd harmonic).
3. Wide look. Excellent attenuation of 3rd harmonic, as well as 144 MHz and 432 MHz band.
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