What is the helical filter and at what frequency band is it used ?
时间：04-09
整理：3721RD
点击：
hi
what is helical filter? what is frequency band of it? can it be used in vhf/uhf?
what is helical filter? what is frequency band of it? can it be used in vhf/uhf?
yes it can be used in VHF/UHF. you may try
http://www.temwell.com.tw/main.htm
to get the idea what frequency range for helical filter.