23cm 1240-1310MHz 300W Band-pass Filter for Transmit and Receive

23cm Band-Pass filter with a super low loss of just 0.16dB is equally suitable for transmitting after linear amplifiers up to 300W and before low noise preamplifiers to prevent overloading from out-of-band signals.  Low loss of filter is achieved with careful design and adjustment.

 

Achieved results on a built Band-pass filter:

Insertion Loss: 

1.8 MHz – 111 dB
14.15 MHz – 108 dB
28.4 MHz – 108 dB
50.1 MHz – 104 dB
54 MHz – 103 dB
70.2 MHz – 95 dB
144 MHz – 75 dB
432 MHz – 43 dB
864.2  MHz – 36 dB

1240 MHz -0.17 dB, RL -31dB
1260 MHz -0.15 dB, RL -32dB

1280 MHz -0.16 dB, RL -34dB

1296.1 MHz -0.16 dB, RL -35dB

1310 MHz -0.15 dB, RL -35dB
2320 MHz – 20 dB

 

Maximum power input at SWR:

1:1 = 300 W; 1:1.5 = 240 W; 1:2 = 175 W; 1:3 = 120 W

 

23cm Band-Pass Filter 300W HF and 6m Attenuation

 

 

1240-1310MHz Band-Pass Filter 300W 4m, 2m, 1.25m, 70cm Attenuation:

 

23cm Band-Pass Filter 300W Zoomed 23cm Insertion Loss Return Loss

23cm Band-Pass Filter 300W 23cm achieved excellent SWR on all frequencies better than 1.05:

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