[R-390] Sigmapert and balun's

[Larry H]

Hi Ed,  They have not had their baluns listed for quite a while.  If you
search the R390 archives about Sigmapert, you will get a few hits.

About baluns:  See this post by *Charles Steinmetz*
http://mailman.qth.net/pipermail/r-390/2020-July/059059.html
As Charles points out,TV baluns are probably not the best solution, if you
really want to use one.

The situation with balun's is that they all have insertion losses.  The
Sigmapert's are designed for HF, but their specs say the least insertion
loss available today in this type of balun would be about .5 db on the low
frequency side, and up to 2.5 db on the high side.  The maximum loss
without a balun due to a mismatch on an R390A is about .3 db.  Impedance
matching in this range on a receiver is not very important.  So, on any
antenna, you will always have weak signals that you'd like to receive
better.  Any good balun will improve the signal strength for the stronger
signals, but you don't need that.  You need improvement on the weak ones,
which is just the opposite of what a balun will do because the
impedance mismatch is not that much on an R-390.

Regards, Larry


On Sat, Jul 17, 2021 at 4:43 AM Edward via R-390 <r-390 at mailman.qth.net>
wrote:

> Looking for the Sigmapert baluns for the R390 balanced antenna input.
>
> Let me know if you have any spares.
>
> Thanks,
> Ed NI6S
>
>