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[aprssig] Kenwood TH-D7 GPS connector grounding

Dave Baxter Dave at emv.co.uk
Mon Sep 15 12:16:24 UTC 2008


They are nice, but they do need some serious supression though!  I've
had then "break into" the receiver's IF on some systems that were
retrofitted with them, in the efforts to reduce power drain, and that is
not always easy to fix..

73.

Dave G0WBX. 

> -----Original Message-----
> From: Alex Carver [mailto:kf4lvz at yahoo.com] 
> Subject: Re: [aprssig] Kenwood TH-D7 GPS connector grounding
> 
> > Date: Sat, 13 Sep 2008 16:26:34 -0700
> > From: Greg D. 
> > Subject: Re: [aprssig] Kenwood TH-D7 GPS connector grounding
> > To: TAPR APRS Mailing List <aprssig at lists.tapr.org>
> > Message-ID:
> > Hi Steve,
> > 
> > Thanks for the link - I had briefly considered such a thing, but 
> > didn't realize that they were available in this small size. 
>  However, 
> > I think I need to pass on them.
> > The problem is that the input voltage range is going to be 
> too great.  
> > They appear to have two versions, one requiring
> > 4.5 to 5.5 v, and the other 10.8 to 13.2v.  Neither matches what I 
> > have.
> 
> Take a look at some of the V78XX-1000 series non-isolated 
> converters available from CUI.  They are three pin switching 
> regulators designed to be drop-in replacements for the LM78XX 
> series linear regulators.   The 5V unit has an input voltage 
> range of 6. to 32 V with efficiencies ranging from 88% to 
> 93%.  It's a bit thicker than a standard TO-220 case but 
> doesn't require a heat sink.
> 
> http://www.cui.com/pdffiles/V78XX-1000%20Series.pdf
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