The LM and its replacement, the LMa, can be powered from an external
DC source as long as you are careful about ground loops between the
power supply and audio sections. The FAQ listed below provides the
details.

To deal with this problem, a special isolated ground battery
eliminator is offered – the ISO9VOLT.

http://www.lectrosonics.com/catalogs/UniversalCatalogPages/BattElims.htm

Also inquired with our service manager to see what experience he may
have had with this. Here is his reply:

<<I have seen a few of these unit come in for repair over the years.
If you drill a hole in the battery door of the LM be sure to remove
the printed circuit board assembly prior to doing so to keep the metal
fillings from causing malfunction. We also have a cable assembly with
a 12 volt plug that is straight (Lectrosonics part # 21425) that will
give more penetration. Beware of the potential for ground loops, see
FAQ # 69.

http://www.lectrosonics.com/faq/faq1byref.php?id=69

I do recommend using the ISO9VOLT with LM.>>

There are two different discussion groups. Actually, it would be
better if you used the other discussion group, since it focuses on
wireless equipment (left-hand link on this page).

http://www.lectrosonics.com/service/list.htm

Best regards,
Bruce Jones


--- In LecNet2@yahoogroups.com, "dhart502000" <dennis@...> wrote:
>
> I have just purchased a couple of LM transmitters (now a discontinued
> product). These transmitters have swivel battery doors. The Lectro 9V
> phantom power supply kit does not provide a replacement "door" for the
> LM series. Has anyone drilled a hole in the bottom of the existing LM
> transmitter door and made the phantom power supply work? The door is
> rather thick and I'm concerned that the right angle power cable from
> by mixer power supply may not have enough penetration to make a good
> connection. Anyone else made this work?
>