[ICOM] Removing FL-53A filter

[Mel]

The 455KHz filters are quite heavy and WILL fall out if the radio is 
bumped.... and not all that hard. Subsequently, Icom developed the 
retaining clips which hold the filter in place without having to flip 
the board. remember this radio dates back to the eighties. At that time 
the 751A was considered a mobile transceiver... small radios like the 
706 or 7000 wouldn't exist for another 15 years! It was also normal 
practice in those days (no surface mount components) to expect amateurs 
to have minimal soldering and assembly skills. Most options were "solder 
in" which required flipping the board. The FL52A/FL53A was actually 
quite unusual requiring only that it only be bolted in.

It might be a good time to suggest to all: If you ship a radio with 
plug-in filters for repair or sale... pull the filters and pack them 
separately! I just received shipment of a used radio I bought second 
hand with the CW filter bouncing around freely inside the radio. 
Fortunately it still worked when lugged back in...

Mel... VE2DC


====================================================================

Thanks to all for the info regarding filter removal. The filter was indeed
bolted to the board. I have no idea why those studs are on these filters. I
guess if you have your rig in a cross country moto cross LandRover it might
keep the filter from jiggling out, but in normal amateur use I can't imagine
why one would want to go to the trouble to fasten those nuts on the studs
and go to the trouble of removing the board to do so. Maybe it would be of
value if a Richter 10 earthquake hits, but ....

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> Today's Topics:
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>    1. WB2CPN (C. Whitaker)
>    2. Re: WB2CPN (Dick Flanagan)
>    3. Re: Removing FL-53A filter (Trottman Compound)
>    4. Re: Removing FL-53A filter (C. Whitaker)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Fri, 3 Jul 2009 12:18:26 -0400
> From: "C. Whitaker" <whitaker at pa.net>
> Subject: [ICOM] WB2CPN
> To: "ICOM Reflector" <icom at mailman.qth.net>
> Message-ID: <008001c9fbf9$e534efd0$2101a8c0 at your6jnhhu0520>
> Content-Type: text/plain;	charset="iso-8859-1"
> 
> Perhaps this is OK now.
> 73  Clete
> 
> 
> 
> ------------------------------
> 
> Message: 2
> Date: Fri, 03 Jul 2009 09:32:12 -0700
> From: Dick Flanagan <dick at k7vc.com>
> Subject: Re: [ICOM] WB2CPN
> To: ICOM Reflector <icom at mailman.qth.net>
> Message-ID: <200907031632.n63GWCCh005732 at pop1.greatbasin.net>
> Content-Type: text/plain; charset="us-ascii"; format=flowed
> 
> At 09:18 AM 7/3/2009, you wrote:
>  >Perhaps this is OK now.
> 
> Clete and I have been working off-line to solve a posting problem.
> 
> Dick
> --
> Dick Flanagan K7VC
> dick at k7vc.com
> 
> 
> 
> 
> ------------------------------
> 
> Message: 3
> Date: Fri, 3 Jul 2009 11:25:16 -0600
> From: "Trottman Compound" <superfly at tetonwireless.net>
> Subject: Re: [ICOM] Removing FL-53A filter
> To: <icom at mailman.qth.net>
> Message-ID: <E675084AF2CC4666B0A59E1B5387A219 at vistaupstairs>
> Content-Type: text/plain;	charset="us-ascii"
> 
> Thanks to all for the info regarding filter removal. The filter was indeed
> bolted to the board. I have no idea why those studs are on these filters. I
> guess if you have your rig in a cross country moto cross LandRover it might
> keep the filter from jiggling out, but in normal amateur use I can't imagine
> why one would want to go to the trouble to fasten those nuts on the studs
> and go to the trouble of removing the board to do so. Maybe it would be of
> value if a Richter 10 earthquake hits, but ....
> 
>  
> 
> Thanks again,
> 
> Matt-K7BG
> 
> 
> 
> ------------------------------
> 
> Message: 4
> Date: Fri, 3 Jul 2009 14:54:48 -0400
> From: "C. Whitaker" <whitaker at pa.net>
> Subject: Re: [ICOM] Removing FL-53A filter
> To: "ICOM Reflector" <icom at mailman.qth.net>
> Message-ID: <001f01c9fc0f$bd19bf60$2101a8c0 at your6jnhhu0520>
> Content-Type: text/plain;	charset="iso-8859-1"
> 
> de WB2CPN
> Acoustic resonance, maybe?
> 73  Clete
> 
> 
> 
> 
> ------------------------------
> 
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> 
> End of Icom Digest, Vol 6, Issue 163
> ************************************
>