In article . com,
wrote:

On Jan 31, 3:38 am, "RHF" wrote:
On Jan 30, 6:38 pm, Telamon

wrote:
In article ,

David wrote:
http://www.minicircuits.com/pdfs/T8-1-X65.pdf

http://www.minicircuits.com/pdfs/T14-1-X65.pdf

You do not have the option of isolating the grounds on either model,
which would ordinarily be an advantage of the voltage type of
transformer.

--
Telamon
Ventura, California

Telamon - That is true. -but- Most so called "MLBs"
Magnetic Longwire Baluns are just such 'common
ground' Matching Transformers. iane ~ RHF
.
.
. .
Unless they have changed the internal wiring since 2001, the primary
and secondary are completly isolated. MC transformers are NOT a
good choice for 'high" RF field locations. I don't know eaxctly at
what point it happens, but I ran into big problems with 2nd harmonic
distortion when I added a ground ring around my home to my ~70' wire
antenna. I also expereinced a number of mix porducts. 1240+770,
1240-770 1240+2(770) etc. MiniCircuit transformers are nice and
compact,but the very small size of the ferrite core limits the
voltage because the micro cores saturate. There are many reports of
MC transfomres getting zapped by static. I never had that problem but
the IMD was a serious issue.

According to the schematic of both parts the low side of the primary and
secondary are tied together.

Wind you own on a suitable core.

Good idea.

--
Telamon
Ventura, California