On Mar 29, 5:37*am, Ian Jackson
wrote:
In message
, RHF
writes
On Mar 28, 1:16*pm, Ian Jackson
wrote:
In message , vangellis
writesThis link shows how I have "grounded"
the setup
http://www.geocities.com/qrp_baluns/LMZ-50-Ground.GIF
vangellis
It's interesting that they have one version which is described as a 10:1
impedance matching voltage transformer, for 50 ohm coax, and the other
described as a 9:1 voltage balun transformer, for 75 ohm coax. It could
be that they are essentially the same inside (why would they want to
make two different types?), but with different connectors. Neither are
actually acting as baluns (although they be using balun transformers
inside the can).
- Some time ago, there was report published of tests
- which compared the received signals levels with
- and without - this type of transformer.
- *From memory, it showed that, on most frequencies,
- there was a very noticeable increase of signal level
- into the receiver. Only on a minority of frequencies was
- there some (acceptable) reduction of level.
- I've had a quick Google, but haven't yet found this report.
- --
- Ian
IAN,
Read this Post : SWL Longwire + Low Noise Antenna
Connection + Grounding Is Key To Good Reception
Three Messages to Read -by- John Doty
http://groups.google.com/group/rec.r...bc6a2bf8acc12d
Follow the Links/URLs provided in the Message.
.
~ RHF
.
Thanks. There's certainly a lot of good reading there, and in the links
in your other posts today. The info particularly in
http://web.archive.org/web/200306090.../naswa/badx/an...
as/SWL_longwire.html
is exactly the sort of thing I was thinking about.
-
- However, there's one thing which I note (just a quick look)
- on several of the websites, and that is the transformer is
- repeatedly referred to as a 'balun'.
-
- It isn't. I suspect that it's because they are using the
- same transformer as the type used in a balun but,
- in this application, a balun it ain't!
- --
- Ian
-
Ian Jackson -read- The Magnetic Long-Wire Antenna Balun
- A Balun It Ain't ! - But It Works
)
http://groups.google.com./group/rec....334b2122c8ddbf
iane ~ RHF