Wide bandwidth 8m 40-45MHz BandPass Filter 300W

Rather wide 8m 40-45MHz BandPass Filter 300W made for Irish 8m Band Plan allocation 40 to 45MHz. The filter could be used with Yaesu FT-991A the Yaesu FTDX10 and other transceivers.

Intended for use with transmitters up to 300 W output, 8m 40-45MHz BandPass Filter 300W protects the receiver from any out-of-band signals. The filter uses high Q coils as well as high Q capacitors. Low loss of filter is achieved with careful design and adjustment.

This filter is equally good as a transmitting and as a receiving with a super low loss of 0.11dB.

The filter will reduce the TVI problem or your problem with neighbors with strong HF, 4m, 2m, or 70 cm transmitters. The filter will eliminate your harmonics.

The 8-meter band and the nearby 6-meter band have a lot in common. It does, however, exhibit the improved propagation mechanisms through the F2 ionospheric layer often found at high frequency (HF), which sporadically appears at 6m, although it is a little lower in frequency.

The 8m 40-45MHz BandPass Filter 300W is placed in a brass box and equipped with 2 female “N” connectors.

 

Wide bandwidth 8m 40-45MHz BandPass Filter 300W

Measured characteristics of 8m 40-45MHz BandPass Filter 300W

Insertion loss:
1.8MHz 100dB
3.8MHz 86dB
7.05MHz 68dB
14.1MHz 47dB
21MHz 32dB
28MHz 17dB
40-45 MHz 0.11dB, Input RL -33 dB
70MHz 24dB
81.36MHz 31dB
122.04MHz 49dB
144MHz 55dB
222.2MHz 75dB

Maximum power input at SWR:
1:1 = 300 W; 1:1.5 = 240 W; 1:2 = 185 W; 1:3 = 150 W

 

8m 40-45MHz BandPass Filter 300W HF Attenuation and Insertion Loss

 

8m 40-45MHz BandPass Filter 300W Harmonics Attenuation

 

8m 40-45MHz BandPass Filter Measured Insertion Loss and Return Loss

 

Feel free to send an e-mail request if you need more. This filter was made for David – EI7KN

All 8m bandpass filters are here

All bandpass filters