[Boatanchors] darn foreign schematic symbols
GGLL
nagato at arnet.com.ar
Tue Aug 11 11:38:29 EDT 2009
I see it also; downloaded the instruction manual, and I guess now
you're correct in your previous assumption regarding the polarity (it's
a non polarized cap, as it is). Note also that they do not state any
value (but for the ptt resistor) so I think they leave you to choose the
adequate value/type.
Regards
Guillermo - LU8EYW.
Dick KF4NS escribió:
> Hi Guillermo,
>
> I see what you mean. That is exactly what I was talking about. In the
> manual though, there are no markings for polarity. I think they just
> made an error in the drawing.
>
> What purpose would that serve in series with the external microphone?
> Usually if there is a capacitor used in association with an external
> mic, it is simply a ceramic in parallel with the mic. Kind of strange, huh?
>
> Thanks for the reply.
>
> 73, Dick KF4NS
> St Petersburg, FL 33714 USA
> Keep The Glow!
>
>
> Message: 4
> Date: Fri, 07 Aug 2009 22:15:25 -0300
> From: GGLL <nagato at arnet.com.ar>
> Subject: Re: [Boatanchors] darn foreign schematic symbols
> To: BoatAnchors <boatanchors at mailman.qth.net>
> Message-ID: <4A7CD1AD.9050908 at arnet.com.ar>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> I cannot find it in the service manual schematic. But found C154 (look
> at IC3c mic preamp and Q17 beside) which is shown as you describe, and
> it's a polarized electrolytic.
>
> Regards
> Guillermo - LU8EYW.
>
> Dick KF4NS escribi?:
>> Wellll, lots of ideas. I am inclined to go with non-polarized
>> capacitor.
>>
>> More info: this is NOT the older HT I have (my mistake) but actually
>> the ICOM IC-T2H of more recent design. There is no value marked for
>> it. It is included in the manual as a source design for the external
>> electret mic/spkr input. The "cap" (?) is shown in the mic input in
>> series with the mic + lead. Hope that helps more.
>>
>> Thanks for all the input, guys.
>>
>> 73, Dick KF4NS
>> St Petersburg, FL 33714 USA
>> Keep The Glow!
>
>
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