Hi Guy,Thanks for the info. Mine is modified also and I've noticed some improvement beyond longwave as well. So, appreciate the clarification. It was Bjarne's report that convinced me to do the modification. Thanks also for posting the files!
Also, thank you Chuck for your reply to my question. Had I not stumbled across Bjarne's report as well as some traffic concerning this on the Airspy list I would have assumed the benefit was mainly for the lofers. I think the added improvement above the BCB was a surprise, a pleasant one, to a lot of folks!
73 to all, Ken Lummi Island, WA Guy Atkins wrote on 9/2/2018 10:59 PM:
Hi Ken, Good question! I forgot to mention that my HF+ SDRs have the "R3 bypass mod" as well as latest firmware installed. The designers of the HF+ expected hobbyists and experimenters to configure and modify the antenna input characteristics, so they made it easy with a larger SMD chip capacitor in-line to the HF antenna input. (Despite being called R3 it is actually a resistor.) Changing or bypassing this part affects the impedance curve of the radio, if I remember right. Initially thought to only help out long wave, it actually gives a decent boost to medium wave sensitivity too, all the way up to 15 MHz per some reports. Top DXer Bjarne Mjelde, among others, has confirmed the R3 bypass improvements-- see his review of the HF+ here: https://app.box.com/s/d2dni57dzrsxgs38gxbbfz9gm26brqpk The last few firmware updates resulted in even better RF overload performance on the HF+, and this on a radio which was already receiving accolades for excellent strong signal handling. 73, Guy Atkins Puyallup, WA
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