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Re: Downconverter for AO40 ?



A low droput regulator would allow the unit to operate from 13.8V up
the coax, and still provide some protection if a higher voltage,
either continuously, or as spikes, were applied.
It also provides some isolation if you want to feed multiple devices
up the coax.

I have chopped the regulator out of mine, and have now observed some
frequency instability (it may be unrelated, of course).

What voltage does the FT-847 put on the coax for the preamp?

73, doug

   From: Estes Wayne-W10191 <W10191@motorola.com>
   Date: Fri, 13 Jun 2003 12:27:48 -0500

   Doug Faunt wrote:

   Has anyone installed a low-dropout regulator into an AIDC converter? It seems to me that would be a good improvement.

   Wayne replies:

   It's easier just to bypass the TSI downconverter's internal 12V regulator.  Then you can power it directly from the "preamp power" voltage on the coax.  Recommended by K5GNA, and it works great for me and many others.  The only potential problem occurs in cold weather, where there is less power dissipation in the downconverter casting, so it doesn't stabilize the temperature as easily.  This can be improved by putting pipe insulation around the downconverter, and/or adding a PTC thermistor to the crystal.

   Wayne Estes W9AE
   Mundelein, IL, USA

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