[ICOM] Icom filter question

[Frank A. Ellis]

Hi Adam,

Good info. FYI, I have an FL-80 here that I
disassembled some years back, as one of the sections
shifted up about 200 Hz. The symptom was a tonal
difference with no signal between USB and LSB, and the
PBT was perfectly aligned. A new filter cured the
problem. I disassembled it as I was curious, and found
discrete crystals and chip caps (the "matching
network"). So, perhaps not all of the 9 MHz filters
are monolithic? 

73 Frank W3UHF



--- Adam Farson <farson at shaw.ca> wrote:

> Hi Frank,
> 
> In fact, the Icom 9 MHz filters (and the high-IF
> roofing filters) are
> monolithic crystal filters (MCF), whilst the 455 kHz
> filters such as the
> FL-44A, FL-52A etc. use discrete crystals with
> matching networks.
> 
> Cheers for now, 73,
> Adam VA7OJ/AB4OJ
>  
> 
> 
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