2 meter 144 MHz – 146 MHz 200 W Transmit – Receive Low Loss Narrow Band pass Filter

Intended for use with transceivers and transverters up to 200 W output, or before any wide band low noise amplifier (LNA) to protect from any out of band signals. Bandpass filter BPF 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 transmitting and as receiving low loss filter (0.25 dB). 

The filter will reduce TVI problem or your problem with neighbors with strong HF, 6 m or 70 cm transmitters.

 

 

Achieved results on a built Band-pass filter:

Suppression – Insertion loss (S21): 

1.8 MHz = -106 dB

3.8 MHz = -110 dB

7.1 MHz = -110 dB

14.1MHz = -105 dB

21.2MHz = -101 dB

28.4MHz = -94 dB

50 MHz = -76 dB

52 MHz = -75 dB

54 MHz = -73 dB

70 MHz = -64 dB

70.5 MHz= -64 dB

88 MHz = -53 dB

98 MHz = -46 dB

108 MHz = -39 dB

144 – 146 MHz = –0.25 dB

288 MHz = – 60 dB

432.1 MHz = – 36 dB

440 MHz = – 44 dB

 

Maximum power input at SWR:

1:1 = 200 W; 1:1.5 = 140 W; 1:2 = 90 W; 1:3 = 70 W (Intermittence 50%)

 

Measured Return Loss (S11) and Insertion Loss (S21). Characteristics of 144 – 146 MHz 200 W Band pass filter:

 

 

2m 200W Transmit – Receive Low Loss Narrow Bandpass Filter

 

 

1. HF Suppression for 144 – 146 MHz 200 W Band-pass filter:

 

2. Suppression on 50 MHz (6 Meter band) for 144 – 146 MHz 200 W Band-pass filter:

3. Suppression on 70 MHz (4 Meter band) as well as FM frequencies for 144 – 146 MHz 200 W Band-pass filter:

4. Zoomed characteristics:

5. Suppression on Harmonic and 70 cm band. Attenuation on 288 MHz harmonic is more than 60 dB and 432 – 440 MHz attenuation is from 36 to 44 dB.

200 W transmitting and receiving band-pass filter could be used for outdoor mounting. Price difference 8 EUR (plastic box “DB” and two brackets).

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 2 meter filters. We have 50 W, 100 W, 200 W, 300 W, 1500 W and 4000 W versions: 2 Meter Band-Pass Filters