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The muRata filter used in the ICOM "PCR" radios is a pin type, and the form factor is a small black rectangle. These fit reasonably well on the M37V's (and presumably "W" model) PCB. You may need to extend a lead or two with small diameter wire to reach the appropriate through-hole on the board.
--- In ultralightdx@..., Rick Robinson wrote:
Hi Gary and Guy,
Thanks for the info on the Icom filter, I'll order one and give it a
try. The muRata is working fine for me and I can DX during the day on
either side of local 1450 WHKP, and semi local WWNC, using this filter
which was not possible with the stock filter. Installing a CFJ455K5 in a
M37W would be impossible as it is very tight in there. I have a 455K5
in my trusty old FRG-7700 and it is a fine filter but way too big for
the tiny Sony. It's a tight squeeze in an SWP.
Guy, is the muRata used in the Icom an SMD or pin device? I'm wondering
about the small amount of space in the M37W.