Yes, it's all isolated from ground.  You don't need an isolation 
transformer unless what you are hooking up needs a ground.
Carl Moreschi N4PY
58 Hogwood Rd
Louisburg, NC 27549
www.n4py.com
On 7/26/2017 11:35 AM, dale via TenTec wrote:
 
Reading in the jupiter manual, it states the external speaker jack is not grounded 
and the output is floating. I have seen suggestions that a audio isolation 
transformer should be put on line between the radio and speaker. Suggesting if you 
don't you can short out the audio amp in the jupiter. about as many also said they 
just plugged in their 1/4" phone plug and every thing worked fine.
      I looked at the drawing of J5, the the ext speaker jack I see no chassis 
ground , is the jack isolated from ground?  as long as the speaker in the 
external,desk speaker
is also not grounded to the speaker case. why would you need a isolation 
transformer?
  Maybe Iam missing something
73
dale
wt4t
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