[ICOM] Icom IC 720A

[D C Macdonald]

If the filter is not available from the mothership,
perhaps somebody could find one in Akihabara.
Just a guess, but the P/N 39M15B sounds as if
it might be a Murata filter.

Mac, K2GKK/5



----Original Message Follows----
From: Gary Fiber <g.fiber at verizon.net>
Reply-To: ICOM Reflector <icom at mailman.qth.net>
To: ICOM Reflector <icom at mailman.qth.net>
Subject: Re: [ICOM] Icom IC 720A
Date: Fri, 16 Jul 2004 03:49:40 -0700

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.