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FLEX-1500 SDR Datasheet: Are there any filters to eliminate images below 490 KHz?
Don Hamrick
Member
RE: FLEX-1500 SDR Datasheet: page 2, General Specifications, Rx Frequency Range: "490 kHz - 54 MHz (operating below 490 kHz requires external, customer provided filters to eliminate images) 160 - 6 m (specified performance in Amateur bands only)" Are there any such filters available at retail? Or is it strictly limited to the home brew market? If so, who has them?
0
Answers
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Don,
I have home brewed simple low pass filters and band pass filters for the 1500 for 660M and 2200M.
http://www.wa4dsy.net/filter/filterdesign.html
http://www.george-smart.co.uk/w/images/thumb/3/3c/472KHz_LPF_Schematic.png/500px-472KHz_LPF_Schemati...
http://www.spirat.com.au/vk5zvs/pic55.htm
Even 2 stages works well and is easily adjusted with miniature 455kHz transformers.
http://www.qsl.net/aa3sj/Pages/Preselector.html
Commercial options
http://www.kiwa.com/LPF.html
,http://www.herostechnology.co.uk/pages/RF_Filters/filters.html#MiniLPF.
Andrew de VK5CV.0
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