2m High Selectivity, High Q, Low Loss Bandpass Filter with SPF-5122Z Preamplifier
In the box is embedded super low loss bandpass filter and preamplifier with SPF-5122Z. Best receiving RFI band-pass filter for Ham Radio designed for 2 meter band with preamplifier.
This combination consists of two devices:
Achieves slightly better results than separate components. Lower NF about 0.05 to 0.1 dB. Thanks to two less connectors.
Thanks to input filtering this preamplifier and band pass filter combination are much more immune to interference from strong signals out of the band.
The recorded data on the assembled filter with HP8753ES network analyzer full 2-port calibrated are presented below.
7 MHz = -78 dB
14 MHz = -67 dB
21 MHz = -60 dB
28 MHz = -51 dB
50 MHz = 36 dB
88 MHz = -16 dB
108 MHz = -5 dB
144 MHz = +26 dB, NF=0.7 dB, Input RL -10 dB
430 MHz = -37 dB
440 MHz = -33 dB
IP3out > 33 dBm.
Power consumption +12 V / 90 mA.
Connectors: "N" Male / Female.
These excellent results were achieved by careful selection of components and design.
Measured Return Loss (S11) and Insertion Loss (S21). Characteristics of 144 - 146 MHz Band pass filter with an amplifier.
More measured results with HP8753ES network analyzer full two port calibrated:
1. Detailed filter characteristics. Measured data of S11, S21, S12, S22.
2. Measured HF attenuation.
3. Measured attenuation on 50 MHz for 144 MHz Band Pass Filter With Pre-Amplifier.
4. Measured FM attenuation.
5. Measured UHF attenuation.
Positions of connectors are selected so that the filter can be directly connected to the coaxial relay as shown. Band pass filter enclosed in strong 1mm sheet brass box. Strong mechanics will ensure stability and longevity.
144MHz High-Selectivity, High-Q, Low Loss Bandpass Filter with SPF-5122Z Very Low Noise Preamplifier and QRO Relay
144MHz High Selectivity, High-Q, Low Loss Band-pass filter with SPF-5122Z Low Noise amplifier connected with coaxial relay CZX-3500
This type of filter will almost nothing disturb noise performance of SPF-5122Z which is especially important in terrestrial and EME (Earth - Moon - Earth) communications. It will further ensure smooth operation in the presence of strong signals.
What others say about Bandpass filters and preamplifiers.
"I received the 2 x BPF144 filters and they work very well. They have resolved my out of band RFI problem and made my 2M EME station more sensitive to weak signals. The small O.2 db insertion loss is more than compensated by having the preamps operating in their linear region and not in compression caused by strong local FM broadcast and Aircraft radio systems. It's a pleasure to do 2M EME now."
73 Paul W2HRO
"LNA test: Two LNA have the same behavior. Gain at 144MHz 25.96 dB, NF 0.68, LNA only Gain 25.73 dB, NF 0.88 dB, LNA + filter. Results seems cosistent and confirm the 0.2 dB loss of the filter.
-1db compression point happened with -3dBm input signal level."
73 Franco I2FAK
"Many thanks, good news today all staff well arrived ! I made DUTs on test this PM to the VNA HP 8510C and to the noise analyzer, congratulations all specs are very well respected ! NF it is a bit better 0.28dB on 144MHz, for the others bands as you say."
73 Sylvain F6CIS
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