Difference between revisions of "70MHz filters"
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| + | Low pass filters on 4m remove signals from e.g. the broadcast radio band beginning at 88MHz. | ||
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QRP-Labs sell a Low Pass Filter kit for 4m that may be suitable for 71MHz duty with the Portsdown TX.[https://www.qrp-labs.com/lpfkit.html qrp-labs.com lpf kit ] | QRP-Labs sell a Low Pass Filter kit for 4m that may be suitable for 71MHz duty with the Portsdown TX.[https://www.qrp-labs.com/lpfkit.html qrp-labs.com lpf kit ] | ||
[[File:20170914 QRP Labs 4m and 2m LPF.jpg|300px|Low pass filter kits from QRP-Labs built by M0YDH for Portsdown TX use. 4m on left and 2m on right ]] | [[File:20170914 QRP Labs 4m and 2m LPF.jpg|300px|Low pass filter kits from QRP-Labs built by M0YDH for Portsdown TX use. 4m on left and 2m on right ]] | ||
Revision as of 18:32, 16 November 2019
Low pass filters on 4m remove signals from e.g. the broadcast radio band beginning at 88MHz.
QRP-Labs sell a Low Pass Filter kit for 4m that may be suitable for 71MHz duty with the Portsdown TX.qrp-labs.com lpf kit
Higher power duty filters. In CQ-TV 260 Charles G4GUO published a low pass filter using ATC capacitors to go in a die cast box.
Mini-kits sell a low pass filter kit described as a 75MHz 7th order Chebychev Low Pass filter.
Band pass filters may present a problem. The QRP-Labs 12m or 10m Band pass filter kits may be a valid point for starting on experimentation for your receiver application.