[ICOM] Icom IC 720A

[Gary Fiber]

Guillermo,

Icom America had some very limited information on a few filters up to the 
FL44. They might have that information on the FL-29. Icom, Inc never 
provided much information on the filter specs to the distributors as no 
design was done beyond the factory so specifications were not required to 
repair a transceiver. You might email them at amateur at icomamerica.com

Gary K8IZ

>         Hello to the group; I'm trying to fix an uncommon problem in  the 
> subject rig, it has a broken filter, FL-29, with center frequency 39.7315 
> MHz, part number 39M15B. This filter is located in RF unit, just prior 
> passband filters. Although its case pins are marked  IN/OUT, it works 
> bidirectionally for RX and TX.
>I disassembled it, just to find it's composed of two ceramic filters and 
>three coils. Well, in short, one of these ceramic filters is bad.
>Where can I get whole FL-29 filter parameters? (impedance, capacitance, 
>etc), just to build a replacement if possible. I guess that's nearly 
>impossible to get one of these anywhere (also because it is not an 
>accessory filter).
>Thanks in advance.
>
>Best regards
>Guillermo - LU8EYW.

Gary Fiber K8IZ
GROL PG-19-6691
Washington State Resident