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[wxsig] Radio Interference Question

Leon Bruner leon at ljjf.net
Sat May 19 15:25:01 UTC 2007


The Icom 27 H  is a mobile unit-

wn0x at earthlink.net wrote:

>Nope.  But I did have an old radio shack htx202 that needed more audio than the model would provide without modification.  Is the 27H an hold hand held?
>
>-----Original Message-----
>  
>
>>From: Leon Bruner <leon at ljjf.net>
>>Sent: May 18, 2007 8:35 PM
>>To: wn0x at earthlink.net, TAPR Weather Station SIG Mailing List <wxsig at lists.tapr.org>
>>Subject: Re: [wxsig] Radio Interference Question
>>
>>Thanks- I appreciate your making this comment.  To be honest, I've been 
>>a little worried about how I was going to manage changing the 
>>components.  I certainly have no special equipment and I don't want to 
>>wreck the board after getting this far!
>>
>>I'm gathering that nobody has any experience with the ICOM 27H- Is it 
>>common that older radios have a lower microphone input impedence than 
>>more recent radios?  I guess another question to ask is what radios work 
>>well with the standard unit?  While I'd like to get the old 27H to work, 
>>maybe I should consider an alternative...
>>
>>Thanks again for all the comments.  It's great to have the help.
>>
>>Leon
>>
>>wn0x at earthlink.net wrote:
>>
>>    
>>
>>>Since these are plated throug holes, you might consider "tacking" the 4.7K resistor over the existing R101 and trying that first. Removing components with plated through holes can be treacherous without the correct equipment.
>>>
>>>Since capacitance in parrallel is additive, you can also tack a capacitor across the existing C111 to increase capacitance.  I wouldn't replace the components at this time, just try adusting the values.  Both should increase the level of audio.
>>>
>>>-----Original Message----
>>> 
>>>
>>>      
>>>





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